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Re: grid driven tetrode

 

On Jan 5, 2007, at 9:21 AM, FRANCIS CARCIA wrote:


Anybody out there know if you get a cleaner output from a tetrode if you keep the screen high and drive G1 with low power living with the distortion produced when the plate swings below the screen OR run low screen voltage low so the plate never swings below the screen.
This means a lot more drive power and driving the G1 positive with higher drive power.
This assumes you don't go above the grid ratings in either configuration. gfz
When the grid is driven positive in a grid-driven amplifier, distortion increases.
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org


Ham Radio Magazine

Garry
 

Does anyone have a March 1975 issue of Ham Radio magazine where you could scan an article and forward to me?

Thanks & 73,
Garry - WR4R


Re: Enough!.... final comment.

FRANCIS CARCIA
 

nice to?hear from?a few people with brains

pentalab wrote:

--- In ham_amplifiers@yahoogroups.com, "David C. Hallam"
> wrote:
>
> Jim,
>
> Socialism doesn't work, has not ever worked, and will never work
for the every reasons you have pointed out in your previous emails.

### Based on what, CNN or ABC ?? You fellows are fed so much
dis-information... it would be very difficult to separate wheat from
chaff.

Anytime you get
> the government involved in anything, corruption causes things to
go to hell.
> Government is the biggest source of corruption in society. It
surpasses
> individuals, businesses, and anything else you can name. God save
us from
> more big government. I'll take big business corruption any day
compare to
> big government corruption.

### go see some documenataries... like "Enron".. and .."whatever
happened to the electric car"... and the classic.... "Walmart"...
or do they ban stuff like that from your local movie theatres ?
The hidden camera scenes are worth it alone. I especially like
the ones about FDA approval. The FDA doesn't test anyting at all..
they just review drug co's research findings.

We elect people who think they know what is
> right for you. They end up knowing what is right for them.

### and u voted for Bush ??

### That little guy... think his name was Ross Perot.. or
similar.... the one with all the flip charts... offered to fix ur
economy for free. I woulda voted for him. What u need is a 3 x
party system.

>
> The US had a famous cowboy philosopher back in the 1920's by the
name of
> Will Rogers. He was a Democrat and probably some what of a
socialist, but
> one of his most famous quotes was " The people elected Calvin
Coolidge
> president. He didn't do much, but that's what the people
wanted." I think
> that's what the people in the US want today. A president and
congress that
> won't do much.

#### Why not just put everything to a plebesite/ vote/ on line
vote ? Let the people decide.

Later.... Jim VE7RF

>
> David
>



Re: Enough!

FRANCIS CARCIA
 

Hal,
You are looking for crow's feet. A term used in the aircraft industry?protecting a wire?bundle goes through a bulkhead. It usually comes in 4 foot hunks. There are a number of different thicknesses. Picture a u shaped channel with square notches cut out of the two sides to let it go around the I.D. of a hole. How about McMaster - Carr?

harold b mandel wrote:

Closure or cloture?

Censor or censure?

At Wally World this morning I went looking for that plastic
stuff that you slide on the edge of your car door to keep it
from chipping paint off of other people's cars in parking lots.

The stuff is clear plastic and has an opening on one edge and
maybe some glue or sticky stuff to keep it on the car door.

It will be used on fan openings in the power supply module
and on the RF deck to finish the 4-1/2" holes, under the grilles.

There was a guy with a WW badge standing at the register in the
Automotive Department. I asked him if he knew where the door edge
protectors might be.

When he answered, "I don't have the faintest idea," I knew it
was a wasted trip. He had a computer terminal right in front of
him, but he probably wasn't authorized to use it.

So then I went on to try and find a sandblaster and powdercoater
for the cabinetry. HA!

$150.00 for sand/bead blasting
$175.00 for the base coat/ steel protective coating
$150.00 for the finish coat

This is for a 23 x 24 x 18 steel box.

In New Jersey I could get this whole thing chrome-plated for $100.00,
and sandblasting is included.

So I figure about twelve cans of textured black Rustoleum spray
at $5.17 per can ought to do it just fine. If I could find a local
source of VHT Wrinkle-Black for that price I would probably go that
route again. The last two chassis projects turned out just fine with
wrinkle finish, and it matches the old Collins stuff just great.

Hal
W4HBM


Re: Enough!.... final comment.

pentalab
 

--- In ham_amplifiers@..., "David C. Hallam"
<dhallam@...> wrote:

Jim,

Socialism doesn't work, has not ever worked, and will never work
for the every reasons you have pointed out in your previous emails.

### Based on what, CNN or ABC ?? You fellows are fed so much
dis-information... it would be very difficult to separate wheat from
chaff.






Anytime you get
the government involved in anything, corruption causes things to
go to hell.
Government is the biggest source of corruption in society. It
surpasses
individuals, businesses, and anything else you can name. God save
us from
more big government. I'll take big business corruption any day
compare to
big government corruption.
### go see some documenataries... like "Enron".. and .."whatever
happened to the electric car"... and the classic.... "Walmart"...
or do they ban stuff like that from your local movie theatres ?
The hidden camera scenes are worth it alone. I especially like
the ones about FDA approval. The FDA doesn't test anyting at all..
they just review drug co's research findings.



We elect people who think they know what is
right for you. They end up knowing what is right for them.
### and u voted for Bush ??

### That little guy... think his name was Ross Perot.. or
similar.... the one with all the flip charts... offered to fix ur
economy for free. I woulda voted for him. What u need is a 3 x
party system.






The US had a famous cowboy philosopher back in the 1920's by the
name of
Will Rogers. He was a Democrat and probably some what of a
socialist, but
one of his most famous quotes was " The people elected Calvin
Coolidge
president. He didn't do much, but that's what the people
wanted." I think
that's what the people in the US want today. A president and
congress that
won't do much.
#### Why not just put everything to a plebesite/ vote/ on line
vote ? Let the people decide.

Later.... Jim VE7RF





David


Never Enough

Robert B. Bonner
 

Hal,

Go for the chrome plating...

That's what I'm going to do...

Bolt on a set of handlebars with PTT switch....

Pretty soon I wont be able to tell if I'm riding or radioing...

Right now the blower in this thing sounds like my Harley... Either the Hog
needs to be louder or the blower quieter. I haven't decided which yet.

BOB DD


Re: Enough!

Wilbert Knol
 

WHAT PART OF ENOUGH! DON'T YOU UNDERSTAND?
I think that's what the majority would like to do. I sincerely doubt
that those who came here to discuss ham radio care about a one man
Hate America campaign. Maybe Cindy Sheehan or Hugo Chavez will take him
in.
Obviously, 'enough!' does not apply to yourself (aka 'the majority').

Wilbert, ZL2BSJ


Re: Enough!

harold b mandel
 

Closure or cloture?

Censor or censure?

At Wally World this morning I went looking for that plastic
stuff that you slide on the edge of your car door to keep it
from chipping paint off of other people's cars in parking lots.

The stuff is clear plastic and has an opening on one edge and
maybe some glue or sticky stuff to keep it on the car door.

It will be used on fan openings in the power supply module
and on the RF deck to finish the 4-1/2" holes, under the grilles.

There was a guy with a WW badge standing at the register in the
Automotive Department. I asked him if he knew where the door edge
protectors might be.

When he answered, "I don't have the faintest idea," I knew it
was a wasted trip. He had a computer terminal right in front of
him, but he probably wasn't authorized to use it.

So then I went on to try and find a sandblaster and powdercoater
for the cabinetry. HA!

$150.00 for sand/bead blasting
$175.00 for the base coat/ steel protective coating
$150.00 for the finish coat

This is for a 23 x 24 x 18 steel box.

In New Jersey I could get this whole thing chrome-plated for $100.00,
and sandblasting is included.

So I figure about twelve cans of textured black Rustoleum spray
at $5.17 per can ought to do it just fine. If I could find a local
source of VHT Wrinkle-Black for that price I would probably go that
route again. The last two chassis projects turned out just fine with
wrinkle finish, and it matches the old Collins stuff just great.

Hal
W4HBM


Re: Enough!

zerobeat40
 

I think you mean "no censorship". Censure refers to a group formally
voting to reprimand something. Censorship is what was happening at
the old group.

Play nice.

Z

--- In ham_amplifiers@..., KR4DA <kr4da@...> wrote:

There is NO MODARATOR.
I created this group on Yahoo.

That's all your going to get out of me.
As it says PLAY NICE.
If there are jerks here so be it. NO CENSURE of
any kind.

So who wants to be the GOD of this group and control
and censure and moderate????? NOT ME.

PLAY NICE and TRY to keep it AMP related..
Your all big boys your gonna just have to act like it.


pentalab wrote:

--- In ham_amplifiers@...
<mailto:ham_amplifiers%40yahoogroups.com>, "Mike(W5UC) & Kathy(K5MWH)"
<w5uc@> wrote:

Francis, several days ago I attempted to end this discussion by
saying that we will not agree on this. We will not! Who is the
moderator here and why isn't he doing his job? It is time to end
this rant designed to promote socialism.
### What's wrong with Socialism ?? Works here. What needs to
be gov't run is stuff like medical/dental/ residential
water/commercial AC power production/ car insurance/ Ferry sytems,
etc. At least that's our idea of.."socilism" You privatize any
of that just mentioned... and prices skyrocket.. and standards drop.

## case in point.... in VE6 land... they had this brilliant idea
they would privatize.. and sell off ALL AC power production. The
idea was that private co's would invest Billions in new power
production. They were gonna chop it up into 8-10 pieces. When
only 4-5 co's showed up... they were surprised... and proceeded
to divvy up the province of alberta into North south east west.
The co's are real happy now. NONE of em compete with each
other... since they have their own turf. None of em are the
slighest bit interested in spending Billions to generate new AC
power. [the provincial gov't there thought with some co spending
billions on new power... rates would...drop]. Instead... there
was no increase in production at all.... rates went up as much as
450 % !!

### In the UK... they did the same thing with their various water
supply's for residential water. Their water rates have gone up
400 % ! They also privatized the construction of new hospital
facilities.... now the consumer is paying through the nose for it.

### cheap electric/water rates means a better economy. You start
paying sky high rates... and the one of 2 things happen.... either
increased production costs get passed onto the consumer... or co XXX
sells up... and moves. In VE6 land... they had foundries that had
been there a long time... and couldn't compete with the province of
manitoba [VE4 land].... due to the huge difference in electrical
rates. The foundries in VE6 land moved to VE4 land.

## If u wanna pay retail + 100%... go for it. Most of us like the
wholesale rate.

later... Jim VE7RF


--
Bob
Vmoa chat list ->
Vmoa tech list home ->


Middleburg Fl (South Jacksonville)
ICQ 13912841
Web Page

Visit the FDXPG at

Ham Radio Calls: KR4DA FG/KR4DA J79DA HK0/KR4DA

Motorcycles CBMMA #4
1977 XS750D 1J7008405
1997 Vmax12J VMOA #504


grid driven tetrode

FRANCIS CARCIA
 

Anybody out there know if you get a cleaner output from a tetrode if you keep the screen high and drive G1 with low power living with the distortion produced when the plate swings below the screen OR run low screen voltage low?so the plate never swings below the screen.
This means a lot more drive power and driving the G1?positive with higher?drive power.
This assumes you don't go above the grid ratings in either configuration.? gfz


Re: TL-922A Owner Question

Steve Cook
 

Benefit?
?
Speed control or other?
?
-S

R L Measures wrote:
Steve == If the fan on my 922 was kaput, I would replace it with a
12vdc brushless fan of the same diameter and power it from the 11vac
filament winding through a FWB rectifier/C-filter.
-ebd
On Jan 4, 2007, at 3:04 PM, Steve Cook wrote:

>
> Anyone owning a Kenwood TL-922 amplifier -- I would like to know
> the part number of the fan mounted on the back of the amp.
>
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org



Everyone is raving about


Re: Enough!

Mike(W5UC) & Kathy(K5MWH)
 

At 09:06 AM 1/5/2007, you wrote:
PLAY NICE and TRY to keep it AMP related..
I think that's what the majority would like to do. I sincerely doubt that those who came here to discuss ham radio care about a one man Hate America campaign. Maybe Cindy Sheehan or Hugo Chavez will take him in.

"age & treachery will overcome youth & skill"


Re: Enough!

KR4DA
 

¿ªÔÆÌåÓý

There is NO MODARATOR.
I created this group on Yahoo.

That's all your going to get out of me.
As it says PLAY NICE.
If? there are jerks here so be it. NO CENSURE of
any kind.

So who wants to be the GOD of this group and control
and censure and moderate????? NOT ME.

PLAY NICE and TRY to keep it AMP related..
Your all big boys your gonna just have to act like it.


pentalab wrote:

--- In ham_amplifiers@yahoogroups.com, "Mike(W5UC) & Kathy(K5MWH)"
wrote:
>
> Francis, several days ago I attempted to end this discussion by
> saying that we will not agree on this. We will not! Who is the
> moderator here and why isn't he doing his job? It is time to end
> this rant designed to promote socialism.

### What's wrong with Socialism ?? Works here. What needs to
be gov't run is stuff like medical/dental/ residential
water/commercial AC power production/ car insurance/ Ferry sytems,
etc. At least that's our idea of.."socilism" You privatize any
of that just mentioned... and prices skyrocket.. and standards drop.

## case in point.... in VE6 land... they had this brilliant idea
they would privatize.. and sell off ALL AC power production. The
idea was that private co's would invest Billions in new power
production. They were gonna chop it up into 8-10 pieces. When
only 4-5 co's showed up... they were surprised... and proceeded
to divvy up the province of alberta into North south east west.
The co's are real happy now. NONE of em compete with each
other... since they have their own turf. None of em are the
slighest bit interested in spending Billions to generate new AC
power. [the provincial gov't there thought with some co spending
billions on new power... rates would...drop]. Instead... there
was no increase in production at all.... rates went up as much as
450 % !!

### In the UK... they did the same thing with their various water
supply's for residential water. Their water rates have gone up
400 % ! They also privatized the construction of new hospital
facilities.... now the consumer is paying through the nose for it.

### cheap electric/water rates means a better economy. You start
paying sky high rates... and the one of 2 things happen.... either
increased production costs get passed onto the consumer... or co XXX
sells up... and moves. In VE6 land... they had foundries that had
been there a long time... and couldn't compete with the province of
manitoba [VE4 land].... due to the huge difference in electrical
rates. The foundries in VE6 land moved to VE4 land.

## If u wanna pay retail + 100%... go for it. Most of us like the
wholesale rate.

later... Jim VE7RF

>


-- 
Bob
Vmoa chat list -> 
Vmoa tech list home -> 


Middleburg Fl (South Jacksonville)
ICQ 13912841
Web Page 

Visit the FDXPG at  

Ham Radio Calls: KR4DA FG/KR4DA J79DA HK0/KR4DA

Motorcycles CBMMA #4
1977 XS750D 1J7008405
1997 Vmax12J VMOA #504 


Re: Enough!

Mike(W5UC) & Kathy(K5MWH)
 

WHAT PART OF ENOUGH! DON'T YOU UNDERSTAND?


At 08:18 AM 1/5/2007, you wrote:

So you think the set up we have today is good?

"David C. Hallam" wrote:
Jim,
?
Socialism doesn't work, has not ever worked, and will never work for the every reasons you have pointed out in your previous emails.? Anytime you get the government involved in anything, corruption causes things to go to hell.? Government is the biggest source of corruption in society.? It surpasses individuals, businesses, and anything else you can name.? God save us from more big government.? I'll take big business corruption any day compare to big government corruption.? We elect people who think they know what is right for you.? They end up knowing what is right for them.
?
The US had a famous cowboy philosopher back in the 1920's by the name of Will Rogers.? He was a Democrat and probably some what of a socialist, but one of his most famous quotes was " The people elected Calvin Coolidge president.? He didn't do much, but that's what the people wanted."? I think that's what the people in the US want today.? A president and congress that won't do much. Stop trying to fix things and just leave us along!!!!!
?
David
?
-----Original Message-----
From: ham_amplifiers@... [ mailto:ham_amplifiers@...]On Behalf Of pentalab
Sent: Thursday, January 04, 2007 4:19 PM
To: ham_amplifiers@...
Subject: [ham_amplifiers] Re: Enough!

--- In ham_amplifiers@..., "Mike(W5UC) & Kathy(K5MWH)"
wrote:
>
> Francis, several days ago I attempted to end this discussion by
> saying that we will not agree on this. We will not! Who is the
> moderator here and why isn't he doing his job? It is time to end
> this rant designed to promote socialism.

### What's wrong with Socialism ?? Works here. What needs to
be gov't run is stuff like medical/dental/ residential
water/commercial AC power production/ car insurance/ Ferry sytems,
etc. At least that's our idea of.."socilism" You privatize any
of that just mentioned... and prices skyrocket.. and standards drop.

## case in point.... in VE6 land... they had this brilliant idea
they would privatize.. and sell off ALL AC power production. The
idea was that private co's would invest Billions in new power
production. They were gonna chop it up into 8-10 pieces. When
only 4-5 co's showed up... they were surprised... and proceeded
to divvy up the province of alberta into North south east west.
The co's are real happy now. NONE of em compete with each
other... since they have their own turf. None of em are the
slighest bit interested in spending Billions to generate new AC
power. [the provincial gov't there thought with some co spending
billions on new power... rates would...drop]. Instead... there
was no increase in production at all.... rates went up as much as
450 % !!

### In the UK... they did the same thing with their various water
supply's for residential water. Their water rates have gone up
400 % ! They also privatized the construction of new hospital
facilities.... now the consumer is paying through the nose for it.

### cheap electric/water rates means a better economy. You start
paying sky high rates... and the one of 2 things happen.... either
increased production costs get passed onto the consumer... or co XXX
sells up... and moves. In VE6 land... they had foundries that had
been there a long time... and couldn't compete with the province of
manitoba [VE4 land].... due to the huge difference in electrical
rates. The foundries in VE6 land moved to VE4 land.

## If u wanna pay retail + 100%... go for it. Most of us like the
wholesale rate.

later... Jim VE7RF

>



No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.16.5/616 - Release Date: 1/4/2007 1:34 PM

"age & treachery will overcome youth & skill"


Re: Enough!

FRANCIS CARCIA
 

So you think the set up we have today is good?

"David C. Hallam" wrote:

Jim,
?
Socialism doesn't work, has not ever worked, and will never work for the every reasons you have pointed out in your previous emails.? Anytime you get the government involved in anything, corruption causes things to go to hell.? Government is the biggest source of corruption in society.? It surpasses individuals, businesses, and anything else you can name.? God save us from more big government.? I'll take big business corruption any day compare to big government corruption.? We elect people who think they know what is right for you.? They end up knowing what is right for them.
?
The US had a famous cowboy philosopher back in the 1920's by the name of Will Rogers.??He was a Democrat and probably?some what of a socialist, but one of his most famous quotes was " The people elected Calvin Coolidge president.? He didn't do much, but that's what the people wanted."? I think that's what the people in the US want today.? A president and congress that won't do much. Stop trying to fix things and just leave us along!!!!!
?
David
?
-----Original Message-----
From: ham_amplifiers@yahoogroups.com [mailto:ham_amplifiers@yahoogroups.com]On Behalf Of pentalab
Sent: Thursday, January 04, 2007 4:19 PM
To: ham_amplifiers@yahoogroups.com
Subject: [ham_amplifiers] Re: Enough!

--- In ham_amplifiers@yahoogroups.com, "Mike(W5UC) & Kathy(K5MWH)"
wrote:
>
> Francis, several days ago I attempted to end this discussion by
> saying that we will not agree on this. We will not! Who is the
> moderator here and why isn't he doing his job? It is time to end
> this rant designed to promote socialism.

### What's wrong with Socialism ?? Works here. What needs to
be gov't run is stuff like medical/dental/ residential
water/commercial AC power production/ car insurance/ Ferry sytems,
etc. At least that's our idea of.."socilism" You privatize any
of that just mentioned... and prices skyrocket.. and standards drop.

## case in point.... in VE6 land... they had this brilliant idea
they would privatize.. and sell off ALL AC power production. The
idea was that private co's would invest Billions in new power
production. They were gonna chop it up into 8-10 pieces. When
only 4-5 co's showed up... they were surprised... and proceeded
to divvy up the province of alberta into North south east west.
The co's are real happy now. NONE of em compete with each
other... since they have their own turf. None of em are the
slighest bit interested in spending Billions to generate new AC
power. [the provincial gov't there thought with some co spending
billions on new power... rates would...drop]. Instead... there
was no increase in production at all.... rates went up as much as
450 % !!

### In the UK... they did the same thing with their various water
supply's for residential water. Their water rates have gone up
400 % ! They also privatized the construction of new hospital
facilities.... now the consumer is paying through the nose for it.

### cheap electric/water rates means a better economy. You start
paying sky high rates... and the one of 2 things happen.... either
increased production costs get passed onto the consumer... or co XXX
sells up... and moves. In VE6 land... they had foundries that had
been there a long time... and couldn't compete with the province of
manitoba [VE4 land].... due to the huge difference in electrical
rates. The foundries in VE6 land moved to VE4 land.

## If u wanna pay retail + 100%... go for it. Most of us like the
wholesale rate.

later... Jim VE7RF

>



Re: Enough- Now to a Choke

Rich & DJ
 

I sniped off a lot of the original and replies.

Thanks Rich for the reply, I saw the parts for sale but I am try to
build what I can. I have completed a hand made, 12Kv plate variable
capacitor. I know I could buy one but then I can't say I made it.
I have a 1" dia phenolic rod for a form and/or 22mm glass tube that
could be mounted on a dowel to make a choke with. I was hoping to do a
single wind of 20ga magnet wire. If I can do this and all does not go up
in smoke and I feel confident I plan on then looking for a vac variable
plate cap and a band switch and building another one for 40 thru 15, I
don't go below 40 and work 15 the most.
I have an extra socket, chimneys, fil transformer and such for the next
amp.
I built the P/S so it is in its own cabinet on wheels, 0 to about 5Kv @
1 amp. The RF deck will sit on top.

Rich, kd0zz

On Jan 4, 2007, at 3:44 PM, Harold Mandel wrote:


Dear Rich,
Look at your reflector archives for the past couple of days.
There's a ham who is selling all sorts of amplifier parts,
including plate chokes.
W2CQM, Ron Lumachi.
He's been on the reflector forever, and he has some great stuff.
Hal
W4HBM

to buy but a lot of stuff to build with. My next thing to figure
out is the plate choke for a 4-1000A, I plan on about 3500v, first
test, it nothing goes up in smoke I can later up the voltage to
4500. The amp will be a mono-bander at first, 21Mhz. With out a dip
meter is there a simple way to build a HV plate choke. I will not
load it to the max , just trying to make something work.



Rich , kd0zz


Re: Enough- Now to a Choke

 

thank you

On Jan 4, 2007, at 3:44 PM, Harold Mandel wrote:


Dear Rich,



Look at your reflector archives for the past couple of days.



There¡¯s a ham who is selling all sorts of amplifier parts,
including plate chokes.



W2CQM, Ron Lumachi.



He¡¯s been on the reflector forever, and he has some great stuff.



Hal

W4HBM



From: ham_amplifiers@...
[mailto:ham_amplifiers@...] On Behalf Of Rich & DJ
Sent: Thursday, January 04, 2007 6:06 PM
To: ham_amplifiers@...
Subject: [ham_amplifiers] Enough- Now to a Choke







Back to Radio / Amp stuff



Hello all you smart people, I don¡¯t have any electrical training
but I am slowlybuilding an amp from my junk box. The power supply
is complete. I enjoyed the information about ¡°glitch¡± protection
and did a cut and paste of all the important notes, making my
information list to build by. I will use a 50ohm resistor and a
small gage wire as a fuse in the HV line. I will also put in a fuse
c/t of the filament / bias line. I don¡¯t have much money (retired)
to buy but a lot of stuff to build with. My next thing to figure
out is the plate choke for a 4-1000A, I plan on about 3500v, first
test, it nothing goes up in smoke I can later up the voltage to
4500. The amp will be a mono-bander at first, 21Mhz. With out a dip
meter is there a simple way to build a HV plate choke. I will not load it to the max , just trying to make something work.



Rich , kd0zz







R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org


Re: TL-922A Owner Question

 

Steve == If the fan on my 922 was kaput, I would replace it with a 12vdc brushless fan of the same diameter and power it from the 11vac filament winding through a FWB rectifier/C-filter.
-ebd
On Jan 4, 2007, at 3:04 PM, Steve Cook wrote:


Anyone owning a Kenwood TL-922 amplifier -- I would like to know the part number of the fan mounted on the back of the amp.
...
R. L. Measures, AG6K, 805.386.3734
r@..., rlm@..., www.somis.org


Re: Enough- Now to a Choke

Rich & DJ
 

Thanks for the information, I already have two chimneys and fans for the
4-1000¡¯s. I also sent you an off list e-mail.

Rich , kdozz

Subject: Re: [ham_amplifiers] Enough- Now to a Choke

Hi Dick --
Good luck on your 4-1000A amplifier. I built one
back in the 70s and you can see it at:

. <> net/~jpk5lad/4-
1000A%20Amp/4-1000a1.htm

I was going to mention a cost-saver for you since
you mentioned about building your amp a low cost.
Many years ago I read a suggestion, I believe in 73
Magazine, where a fellow suggested using a 1 gallon
pickle jar as a replacement for the more expensive
Pyrex chimney for a 4-1000A. He cut out the bottom
and enlarged the top and claimed it fit the air socket
just fine. At the time I read that I think my regular
Pyrex chimney cost me $12 but I put that bit of
information in the back of my skull in case I ever
needed to have another one or a replacement. So
far I've never had to use it.

You mentioned that you already had a chimney so
you won't need that bit of info either but it might be
worth remembering for something.

The plate choke I used in my amp was commercially
available but I don't recall the manufacturer. They
probably aren't in business now anyway. (Oh no....I
hope that doesn't resurrect the recent thread on the
ham_amplifier reflector which had nothing to do with
ham_amplifiers.)

Good luck on your project. There's nothing quite like
the feeling you get from throwing the switch on a
3500+ volt power supply connected to a newly-build
but totally-untested amplifier. You've heard about
people who saw their whole life flash before their
eyes? That's similar.

73,
Jim - K5LAD

On 4 Jan 2007 at 17:05, Rich & DJ wrote:
Back to Radio / Amp stuff

Hello all you smart people, I don?t have any electrical
training but I am slowly building an amp from my junk
box. The power supply is complete. I enjoyed the
information about "glitch"protection and did a cut and
paste of all the important notes, making my information
list to build by. I will use a 50ohm resistor and a small
gage wire as a fuse in the HV line. I will also put in a
fuse c/t of the filament / bias line. I don?t have much
money (retired) to buy but a lot of stuff to build with. My
next thing to figure out is the plate choke for a 4-1000A,
I plan on about 3500v, first test, it nothing goes up in
smoke I can later up the voltage to 4500. The amp will
be a mono-bander at first, 21Mhz. With out a dip meter
is there a simple way to build a HV plate choke. I will
not load it to the max , just trying to make something
work.

Rich , kd0zz


Re: Enough- Now to a Choke

Rich & DJ
 

I don¡¯t think the Coleman works on the 4/or3-1000 I think its for the
3-500 size. I hope to sneak up on the 3500V , I know it wont tune just
right but I will soft start it with an autotransformer , not just flip
3500v to it cold. Then increase the drive. It does have a standard soft
start set up in the PS.

Rich

-----Original Message-----
From: ham_amplifiers@...
[mailto:ham_amplifiers@...] On Behalf Of Randy
Sent: Thursday, January 04, 2007 7:31 PM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Enough- Now to a Choke

Jim:
Just to throw in my $.02, I forget which tube it
was, but the glass from Coleman lanterns are
supposed to make fine chimneys for one or the
other, and heat isn't such a concern. I'm sure
somebody will pipe up with the answer, I just
mention it also along the lines of saving $.

73,
Randy
KZ4RV

K5LAD@... <mailto:K5LAD%40arrl.net> wrote:

Hi Dick --
Good luck on your 4-1000A amplifier. I built one
back in the 70s and you can see it at:

. <>
net/~jpk5lad/4- <.
<> net/%7Ejpk5lad/4->
1000A%20Amp/4-1000a1.htm

I was going to mention a cost-saver for you since
you mentioned about building your amp a low cost.
Many years ago I read a suggestion, I believe in 73
Magazine, where a fellow suggested using a 1 gallon
pickle jar as a replacement for the more expensive
Pyrex chimney for a 4-1000A. He cut out the bottom
and enlarged the top and claimed it fit the air socket
just fine. At the time I read that I think my regular
Pyrex chimney cost me $12 but I put that bit of
information in the back of my skull in case I ever
needed to have another one or a replacement. So
far I've never had to use it.

You mentioned that you already had a chimney so
you won't need that bit of info either but it might be
worth remembering for something.

The plate choke I used in my amp was commercially
available but I don't recall the manufacturer. They
probably aren't in business now anyway. (Oh no....I
hope that doesn't resurrect the recent thread on the
ham_amplifier reflector which had nothing to do with
ham_amplifiers.)

Good luck on your project. There's nothing quite like
the feeling you get from throwing the switch on a
3500+ volt power supply connected to a newly-build
but totally-untested amplifier. You've heard about
people who saw their whole life flash before their
eyes? That's similar.

73,
Jim - K5LAD

On 4 Jan 2007 at 17:05, Rich & DJ wrote:
Back to Radio / Amp stuff

Hello all you smart people, I don?t have any electrical
training but I am slowly building an amp from my junk
box. The power supply is complete. I enjoyed the
information about "glitch"protection and did a cut and
paste of all the important notes, making my information
list to build by. I will use a 50ohm resistor and a small
gage wire as a fuse in the HV line. I will also put in a
fuse c/t of the filament / bias line. I don?t have much
money (retired) to buy but a lot of stuff to build with. My
next thing to figure out is the plate choke for a 4-1000A,
I plan on about 3500v, first test, it nothing goes up in
smoke I can later up the voltage to 4500. The amp will
be a mono-bander at first, 21Mhz. With out a dip meter
is there a simple way to build a HV plate choke. I will
not load it to the max , just trying to make something
work.

Rich , kd0zz
"It's so simple to be wise. Just think of something
stupid to say and then don't say it." -- Sam
Levenson
=======================================
My Web Page - . <>
net/~jpk5lad
<. <>
net/%7Ejpk5lad>