开云体育

--- In ham_amplifiers@..., Tony King - W4ZT <w4zt2007@...>
wrote:

This person is really off his/her rocker!
<>

73, Tony W4ZT

## This is a joke right ?? BTW... RG-217 is puny stuff.... it's
the 50 ohm version of the older RG-14 52 ohm 5/8" plane jane
coax.... slightly bigger than RG-213. Both RG-217 and RG-14au
are 5/8" od. 217 has a 10 ga solid center conductor.. and is
still being sold.

## IF he is talking about RG-17..... they have not made that stuff
since the 70's. [it was 52 ohm] RG17 was used with LC connector's...
and the solid center conductor IS the center pin !

### RG-17 is now called RG-218. RG218 is the newer 50 ohm
version... and has a slightly bigger cenetr conductor.... which will
not fit the older LC femal chassis connector's... unless grns down a
bit. Both RG17 and RG-218 ate huge 1" diam.... and have the
same loss's as LMR-600 or 1/2" heliax.

Later.... Jim VE7RF

开云体育

--- In ham_amplifiers@..., Tony King - W4ZT
<w4zt2007@...> wrote:

Questions he/she answered:
"Questions from other members

Question & Answer Answered On
Q: What is the tube # in amp? jsbtsb38
Jan-09-07
A: Hello, 2 amp continious 36,000 volts turned down to

34,000 volts, 6

amp diodes power supply, oil field capasader, 3CX 1500 same as 8877
military issue...more

Wow! I would really like to get ahold of one of them "oil field
capasaders!" Maybe that is the key to the tremendous power of this
wonderful amplifier.

(((73)))
Phil, K5PC

--- In ham_amplifiers@..., 1800 Toll Free
<TollFree1800@...> wrote:

On Sun, 14 Jan 2007 05:39:33 -0800, pentalab <jim.thomson@...>

wrote:

### BTW... I had a call from Arnold Howell not too long

ago....

IF any of ur 11m buddy's require YC-243's... [ Eimac
SOCKETLESS version of a 3CX-6000A7 / YU-148] lemme now

asap....

if he gets enough interest.... he's gonna get Eimac to do a

small

production run.... BUT he won't do it unless at least 10 x

tubes

are ordered.

I've already sent some email's out. Can't guarantee anything, but

I'll

see what I can do.

Any idea on what out the door price will be? I have a YC-156

project

coming up that might be scrapped due to the enlightenment of this

new tube

/ cooling tower. :)

### The one I got directly from Howell was $1100.00 a few yrs
back. Packed in Foam, in the Eimac box...foam on all 6 x sides.
When u consider the current price for an Eimac 3CX3000A7 [3x3]...
then throw in the megabuck socket... you now have MORE money
invested... than if you just bought the YC-243 in the 1st place !

### Buying a new Eimac 3CX-6000A7 + mega buck socket = plane
nuts imo. The Eimac 3CX-6000A7 alone costs MORE than the YC-
243.... plus u require the same megabuck socket.

One of the gentleman I sent said email to builds custom 1x and 2x

6K

boxes. I'm <<thinkin>> he might jump on this, but.. You know how

11 meter

people are :) lol

### The cost of a 2 x 6K... just for the PAIR of sockets is
insane... that's $750.00 just for a PAIR of sockets. ... and if u
bust some finger stock on the grid ring.... well I don't see
anybody selling the grid rings separately.

### The YC-243 is slick.... comes with a built in 4.25" diam

grid

flange vs the 4" diam grid ring on the socketed version. The
fil assy is solid silver plated bar stock.... with two huge
threaded bolts pointed straight down, embedded in the bar stock.

I'm going to take a nice hard look at it.

If you would have said something 2 months ago, I might have

ordered all 10

of them myself. Instead the wife says all monies at this point go

towards

house purchase. Damn family obligations :) At least I get a

dedicated

10X12 ham room at the new house ;) Detached and all :)

#### I posted the PDF YC-243 file on the "file" section last
night. I got it from Reid Brandon himself. It does have some minor
error's in it that need to be corrected.

### What they did is, they took a low MU 3CX4500F3/YU-108
industrial heater tube... and stuffed the 225 W high MU grid in it.
Then they tossed the pair of flexible leads.. and used the huge
copper threaded studs instead.. and embedded em in the bar stock.

### The bigger the initial order.. the lower the price tag is. The
next drop in price is quanity's 11-49 tubes.

### Just whack a hole in chassis... and bolt grid flange [ 1/8"
thick] to chassis with 12 x 1/4-20 bolts. All silver

plated..

a real thing of beauty.

Sounds good... Kind of like what the YC156 should have been (what

WHERE

they thinking with the grid structure in that tube?)

### The YC-156 is a throw away [as in can't be rebuilt] 8 min warm
up, oxide tube... with a huge diam ceramic stem.. and too small an
anode cooler [4.94"] End result is air intake on bottom sides of
fins is restricted... and hideous pressure is required to force air
through em. It requires a lot of bias too.

### Economy Electronics doesn't sell em anymore either... and
it's Howell's design.

There was another "one off" tube being offered that I can't

remember the

name of.. It was a YC tube as well, but was the "solid state"

replacement

for the 3-500Z. Offered 1600 watts of plate dissipation, as I

remember.

Reminded me of Kenny in San Diego and his dual 1200A7 modified

L4Bs and

Henry's. Nice desktop 5K units :).... I just wondered what the
intelligence was behind building amps based on one off tubes.

### Howell also has a Hod rod version of a 1200.... called a YU-
120.... 1500 w of anode diss... plugs straight into a 3-500 Z
socket. 11m guys buy a lot of em.

I'm assuming these YC-243s are rebuildable, since they are

basically one off designs?

### Yes... rebuilt by Eimac themselves.. and also Econco.. and also
Freeland. Most guys are getting Freeland to rebuild em. Most guys
are going through Howell to have em rebuilt too... since he has a
huge pull with Freeland, and can get a way better price getting em
rebuilt for you.. as compared to you dealing directly with freeland
directly.

### Reid Brandon tells me on the phone a while back... that they
have never had any problems rebuilding em either.... and none that
have been sent in for a rebuild have come in with the grids smoked
in em either. And he's talking about YC-243's that have had the
crap driven outa them too!

### The YC-243 retains the glazed Ceramic stem from the industrial
heater 3CX-4500F7 version.. more rugged... and easily cleaned...
which is why they use that kind of ceramic stem in industrial
heater tubes.

### They sell for LESS than a standard socketed 3CX-6000A7...

and

now that the sockets from RF parts are up to $375.00.... u save
the cost of the socket as well.

The price of tube sockets is like gas, cigarettes and sex. People

will

spend because they have to.

### Well now they Don't have to waste money on expensive sockets.
Like I said b4... the YC-243 is cheaper than buying a new 3x3 +
socket. It's too easy to damage/break the finger stock on the RF
parts grid ring.

And nobody wants to tell Eimac they are doing us a disservice by

NOT incorporating a socket into every tube they build.

### I got into that exact topic with Reid on the phone. He knows
my thoughts on this all too well. [a] we don't need a socket...
period. [b] told him to start building more socketless
triodes .... b4 Svetlana does... and Eimac could easily get a jump
on their competition. I badgered Reid for quite a while a few
years ago... and so did Howell.... then, outa the blue the YC-243
appears. Reid then informs me about another socketless triode....
called a ... 3CX-20,000C7 [socketless version of a 3CX-
20,000A7].. same deal... huge built in grid flange... just bolt it
to the chassis... 160A fil... and a 500 W grid.


### Since these tubes can be grid driven.... I'm convinced that
running em in GG.. with grid flange bolted to chassis, will increase
the overall grid diss by a little bit. [you have heatsinked the
grid to the cold chassis]



### Howell tells me on the phone 3 x weeks ago, he is getting a
socketless 35,000 A7 GG triode built by Eimac as well... so stay
tuned. It's supposed to be out shortly.

### The linearity on the YC-243 is superb. I was told several
times to getter the YC-243 for a full 48 hrs.. with just rated fil
v and blower for the entire weekend... prior to applying HV. It
worked too. It's a 7.0 v rated tube.... and power output doesn't
drop off till fil V is below 6.1 V. So it will last a long time.
[fil v measued directly at socket.. via a 1 mh choke in each
metering leg.]

Any other thoughts on that? My take was it's a lot more stable

amp with

not having a socket, as long as you get a GOOD connection ALL THE

WAY

around the bolt in grid flanges? Not to mention, I always liked

having

bolt together connections, instead of finger stock, on my 160A

filaments :)

### agreed. The 4.25" built in grid flange is an intregal part of
the tube... it is NOT bolted on.. like a vac variable flange.
It's welded right to the grid ring... looks like it was cast that
way.. and all silver plated... including insides of all 12 x 1/4-20
holes. Both sides of the fil connections are all silver plated.
It's a WAY better method of making a 79 A fil connection... than
the RF parts socket.

I've already called someone working on a single 3x3K dring a 3x20K

amp.

He is going to try testing out your cooling method on his 3x3 amp,

and if

it works as well as it looks / claimed, he's also going to try it

on the

3x20k amp.

Plate dissipation increases are always nice :)

### Eimac specs the 3x6 at 6 kw anode diss... with 203 cfm
@ .4" h2o pressure... and with an inlet temp of 50 deg C [121 deg
F]. With 315 cfm @ .9" h20.... and a lower inlet air temp...
like 20 deg C [68 deg F] anode diss increases to 9700 W. With
an inlet air temp of 25 deg C... it's still 9200 W. And with an
inlet temp of 50 deg C [121 deg F]... it's STILL an easy 7500 W.

## This tube has such low back pressure requirements as is..
stock... it was a snatch to figure out it was gonna be real easy to
blow more air through it. The secret is in the small diam stem ...
plus the 6.125" cooler. The underside of the fins is a huge
area. The real trick is I calculated you need at LEAST as much
surface area in the form of either holes, slots, or slots cut like
a Maltese cross, in the chassis.. and preferably even more surface
area cut outa the chassis.... compared to underside of tube fin
area.

### The 9.5" square wooden box remains intact too. IF doing
this from scratch... I would suggest using the big greenlee
punches.. and whacking a ring of I think it was aprx 1 5/8" diam
holes around the base of the tube. In the photo page... u can see
the original small ring of holes, and stock grey Economy Electronics
chimney. Economy said the reason they made the chimneys bigger
diam than needed, is that for some reason.. when the tubes come back
from the rebuilders... the OD of the tube anode is always slightly
bigger than the stock 6.125". Howell said the exact same thing..
and Howell's solid Teflon chimney is now bigger ID also.

### we were NOT impressed with this "standard" set up...... hence
the 9.5" square box idea. Some will make the box outa thick
micarta... or thick teflon... but the plane wood works just fine. 2
x screws hold the box to the chassis.. so it doesn't budge.. and
makes a perfect air tight seal.

### By making the box even taller... you can toss the
economy/howell chimney's.... and just use a solid teflon flat top...
with a hole cut into it... to make an EXACT fit for the tube. And
if it comes back from the rebuilder's with a slightly bigger anode
OD.... then simply remove the teflon flat top piece.. and replace
it with another one... this time with a slightly bigger hole.
The solid 3/16" teflon top is screwed to vertical sides of box...
since vertical sides are plenty thick enough.

### End result is a TON of extra air flow.... and dirt cheap to
build... except for the teflon top.

### You can see all 50+ pix of this on the photo page . Click
on "photo's".... then "VE7RF" [it's the photo album with the
25 kw CD slug. ]

I will.

I've got a pic of a dual 15000 box being put together.

The "owner" wants

no "fame", so to speak, but if I can get him to let me put it up I

will.

## That's good. Pix are worth a thousand words. Contact me
offline if u need Howell's e mail/ ph number etc.

later... Jim VE7RF

--Toll_Free

--- In ham_amplifiers@..., "Hsu" <Jbenson@...> wrote:

Good Morning

The mention of Ham Radio Magazine reminded me of an article I've
been looking for for years. It was Vacuum Tubes. using odd ball tubes
in linear amplifier service. It was written by W5JJ and was on page
58 of the Sep 1972 Ham Radio Magazine. The library had the index, but
no magazines that old.. Please someone dig this article out of your
archives so I can finally know what oddball tubes can be used in
linears :)
Pat

Thanks!David,
This ia the power meter's

schematic.,yo
u can view it.if not please e-mail to me direct, I'll sned to
you.Does anyone have this article?

73! Hsu
----- Original Message -----
From: David C. Hallam
To: ham_amplifiers@...
Sent: Saturday, January 06, 2007 11:16 PM
Subject: RE: [ham_amplifiers] Ham Radio Magazine



Hsu,

Sorry but I don't. My Ham Radio on CD only goes up to 1976. I

have been meaning to buy the second CD from ARRL with the rest of the
issues but just have never done it.

73
David
-----Original Message-----
From: ham_amplifiers@...

[mailto:ham_amplifiers@...]On Behalf Of Hsu

Sent: Saturday, January 06, 2007 8:48 AM
To: ham_amplifiers@...
Subject: Re: [ham_amplifiers] Ham Radio Magazine



Hi, David,
Do you have the Ham radio Dec 1977 P38-43, J.H.

Bowen "Accurate Low

Power RF Wattmeter for High Freqency and VHF Measurements"?
Thanks!
73!Hsu
----- Original Message -----
From: David C. Hallam
To: ham_amplifiers@...
Sent: Saturday, January 06, 2007 8:46 PM
Subject: RE: [ham_amplifiers] Ham Radio Magazine



Garry,

I have that issue on CD. What article do you want?

David
KC2JD

-----Original Message-----
From: ham_amplifiers@...

[mailto:ham_amplifiers@...]On Behalf Of Garry

Sent: Friday, January 05, 2007 7:57 PM
To: Ham Amplifiers
Subject: [ham_amplifiers] Ham Radio Magazine


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

I heard the same story, pretty much. And I can also say I've been privy to some back door sales from that neck of the woods, as well.

Do you know Dennis O? I believe he and the boys down south went back a little as well... Last time we where all down there (when we took the videos on bigradios.com) they all seemed to know him at the "new" shop.


Fun, going down memory lane. Also nice to not be bashed to hell and back over being both on 11 and the ham bands. As far as I'm concerned, QRO is QRO... lol.



Although I'd LOVE to go to John Lyles work for just a week / week and a half.



--Toll_Free

--



*Ratings are for transistors, tubes have guidelines*

--- In ham_amplifiers@..., 1800 Toll Free
<TollFree1800@...> wrote:

When Calvin started pumpin money into the place, they went to

3CX3000s and

3CX350s for drivers.

I'd say that Mr. Powers was pumping more parts into the place then
greenbacks. Calvin worked for Maco on and off for years. Dick fired
him once over stealing, but hired him back. I bought a bag of 500
slug type tuning coils (the ones in the Maco amps used for the input-
SWR tuning) for $50 off my friend in Missippi. I was going to buy
them from Maco since they ordered extra for me. My friend said he had
500 that were "similar" so I bought them for 1/10 the price. After I
got them in, they were the same coils. I made a quick call and found
he got them from Calvin. Hmmm, where do you think they come from?
They was hot as a firecracker I was told.

When Dick moved the amp manufacturing part out of the main building
down the street, after the big bust, that was when the big rip off
occured. They opened the shop one morning and was cleaned out in a
lot of parts. I wouldn't doubt that a lot of the steel and large
glass tubes came from Maco that were used in these amps. Melvin and
Pete bought the parts from Dick for around $20,000 I heard. Dick had
the balls to ask me $150,000 for the same parts at the time, and I
said Hell NO!

Tenessee Walker is the "brand name", but you're pretty much

correct, on

the 'Experts' on the playing field.


We might have met somewhere, sometime :)



--Toll_Free


On Sun, 14 Jan 2007 19:01:46 -0800, craxd <craxd@...> wrote:

The guys making these are ex-Maco employees down in Memphis, TN.
Melvin and Sneaky Pete is who I know them by. They bought out what
was left of the Maco amp parts back when Dick Orgal and myself

quit

building amps when the tubes ran out around 89 or 90. Their

problem

is they don't build with the quality components we used, nor

really

know how to design them. Their major problems were under-sized

power

supplies, very noisy blowers, and shoddy workmanship. One can see

in

this one that the layout is terrible. The power supply is a mess.

The

cabinets look like the ones built by another friend on mine (Mark
Davis) down in Olive Branch, Mississippi just across the state

line

from Memphis. If so, this is one of their older amps since Mark

quit

a few years back when his wife bacame ill (unless Marks boy built
them). Mark (now around 75-80 years old or so) used to build my
cabinets and wind my transformers. Plus, he did build some decent
amps himself. He also worked with Maco for a short while when I

was

associated with them back in the early 80's. I can't tell what

tubes

are in this one, but they were mostly built with 4CX250B's. These
look to be a larger tube. 10 kW though, ehhhh I highly doubt that.

Best,

Will

When Calvin started pumpin money into the place, they went to 3CX3000s and 3CX350s for drivers.



Tenessee Walker is the "brand name", but you're pretty much correct, on
the 'Experts' on the playing field.


We might have met somewhere, sometime :)



--Toll_Free


On Sun, 14 Jan 2007 19:01:46 -0800, craxd <craxd@...> wrote:

The guys making these are ex-Maco employees down in Memphis, TN.
Melvin and Sneaky Pete is who I know them by. They bought out what
was left of the Maco amp parts back when Dick Orgal and myself quit
building amps when the tubes ran out around 89 or 90. Their problem
is they don't build with the quality components we used, nor really
know how to design them. Their major problems were under-sized power
supplies, very noisy blowers, and shoddy workmanship. One can see in
this one that the layout is terrible. The power supply is a mess. The
cabinets look like the ones built by another friend on mine (Mark
Davis) down in Olive Branch, Mississippi just across the state line
from Memphis. If so, this is one of their older amps since Mark quit
a few years back when his wife bacame ill (unless Marks boy built
them). Mark (now around 75-80 years old or so) used to build my
cabinets and wind my transformers. Plus, he did build some decent
amps himself. He also worked with Maco for a short while when I was
associated with them back in the early 80's. I can't tell what tubes
are in this one, but they were mostly built with 4CX250B's. These
look to be a larger tube. 10 kW though, ehhhh I highly doubt that.

Best,

Will


--- In ham_amplifiers@..., "Robert B.
Bonner" <rbonner@...> wrote:

Tony, you have to be in your rocker first to get off of it.

This is so typical of CBers.

I already told the story of the CB shop near where I lived in the

70's he

had a treddle peddle on his wattmeter under the bench. As he

"PEAKED" the

radios while whistling them up, he'd push the peddle further.

HE could peak up a basic rig to 24 watts I hear...

BOB DD

-----Original Message-----
From: ham_amplifiers@...

[mailto:ham_amplifiers@...]

On Behalf Of Tony King - W4ZT
Sent: Sunday, January 14, 2007 7:58 PM
To: ham_amplifiers@...
Subject: [ham_amplifiers] Real Yahoo amp on Ebay...

This person is really off his/her rocker!
<>

73, Tony W4ZT



Yahoo! Groups Links

--



*Ratings are for transistors, tubes have guidelines*

Also, click on the bid history, currently 15 bids, and you'll see the classic example of shill bidding... strictly against Ebay's rules.

73, Tony W4ZT



Tony King - W4ZT wrote:

Questions he/she answered:
"Questions from other members

Question & Answer Answered On
Q: What is the tube # in amp? jsbtsb38
Jan-09-07
A: Hello, 2 amp continious 36,000 volts turned down to 34,000 volts, 6 amp diodes power supply, oil field capasader, 3CX 1500 same as 8877 military issue...more

Q: hello, what wre the tubes? thank the zipperrs
Jan-09-07
A: Hello, they are 3CX 1500-tge same as a 8877 military issue but better and they are at 100%."

73, Tony W4ZT

craxd wrote:

It's a pair of 3CX1500's (8877)... no where close to the power he claims. Nor close to the voltage he claims. That particular amp isn't going to be able to do anywhere close to the claimed power even IF the power supply could handle it... which it can't.

Quote from the ad:
"this is a tenn-walker amp/linear. it was just rebuilt has two steel tubes and brand new transformer, this transformer will handle more tubes, if you decide to make this piece bigger, it runs on 220 with a 60 amp braker on low side she puts out 10,000 watts of power, and will cruise all day and great key-down time. now on the high side look out cb'ers you are gone. this unit will easy put out a whopping 15,000 watts, will do more but the builder told me I can't run as hard on the key down time. I run this piece on a 6 element beam, maco 6. you will have to have 25,000 watt gama's. I run 217 coax with this piece. this is a high power unit. it is built to talk on ch-6. I like to have fun with the other big boys. I used to by the name needle bender the 747 on the air. I use a bird peek meter with this, with a 25,00 watt-slug, made by coaxial dynamics 2-30 MHZ 25 KW, because bird only makes a 10 KW and this slam's that slug on the low side. I will hook it up and show you how it works. this is a heavy piece and should be picked up, but I will ship it at the buyer's expense. I guarantee this to be a good working piece, BUT I have to sell it as-is due to the nature of this. Any other questions feel free to e-mail me or call my cell phone at 231-225-1957 and I will try to answer all questions. this piece is DALE-MADE here in the Lansing, Michigan area. GOOD-LUCK BIDDING>I will consider selling driver with it, also 100 feet of coax and more. NOTE: This is a two (2) piece unit."

73, Tony W4ZT


craxd wrote:

The guys making these are ex-Maco employees down in Memphis, TN.
Melvin and Sneaky Pete is who I know them by. They bought out what
was left of the Maco amp parts back when Dick Orgal and myself quit
building amps when the tubes ran out around 89 or 90. Their problem
is they don't build with the quality components we used, nor really
know how to design them. Their major problems were under-sized power
supplies, very noisy blowers, and shoddy workmanship. One can see in
this one that the layout is terrible. The power supply is a mess. The
cabinets look like the ones built by another friend on mine (Mark
Davis) down in Olive Branch, Mississippi just across the state line
from Memphis. If so, this is one of their older amps since Mark quit
a few years back when his wife bacame ill (unless Marks boy built
them). Mark (now around 75-80 years old or so) used to build my
cabinets and wind my transformers. Plus, he did build some decent
amps himself. He also worked with Maco for a short while when I was
associated with them back in the early 80's. I can't tell what tubes
are in this one, but they were mostly built with 4CX250B's. These
look to be a larger tube. 10 kW though, ehhhh I highly doubt that.

Best,

Will


--- In ham_amplifiers@..., "Robert B.
Bonner" <rbonner@...> wrote:

Tony, you have to be in your rocker first to get off of it.

This is so typical of CBers.

I already told the story of the CB shop near where I lived in the

70's he

had a treddle peddle on his wattmeter under the bench. As he

"PEAKED" the

radios while whistling them up, he'd push the peddle further.

HE could peak up a basic rig to 24 watts I hear...

BOB DD

-----Original Message-----
From: ham_amplifiers@...

[mailto:ham_amplifiers@...]

On Behalf Of Tony King - W4ZT
Sent: Sunday, January 14, 2007 7:58 PM
To: ham_amplifiers@...
Subject: [ham_amplifiers] Real Yahoo amp on Ebay...

This person is really off his/her rocker!
<>

73, Tony W4ZT



Yahoo! Groups Links

lol...


That guy started out cloning the Pride DX300... Then started adding tubes
to them.

He has quite a keydown vehicle, as well... Lots of alternators, but he
actually claims that the "flex" the alternators have on them when he
"fires down" (ie, the drag causing them to flex in their mounts) helps him.

Controlled damage?


--Toll_Free


On Sun, 14 Jan 2007 17:58:12 -0800, Tony King - W4ZT <w4zt2007@...>
wrote:

This person is really off his/her rocker!
<>

73, Tony W4ZT

--



*Ratings are for transistors, tubes have guidelines*

Tony, you have to be in your rocker first to get off of it.

This is so typical of CBers.

I already told the story of the CB shop near where I lived in the 70's he
had a treddle peddle on his wattmeter under the bench. As he "PEAKED" the
radios while whistling them up, he'd push the peddle further.

HE could peak up a basic rig to 24 watts I hear...

BOB DD

This person is really off his/her rocker!
<>

73, Tony W4ZT

On Sun, 14 Jan 2007 05:39:33 -0800, pentalab <jim.thomson@...> wrote:

--- In ham_amplifiers@..., 1800 Toll Free
<TollFree1800@...> wrote:

Of course, since the waveform is nothing more than a squarewave

when it hits the pair of 4CX15000's, they can take being driven by
15,000 watts.

The duty cycle is a lot less than 100 percent, overall.

### I take it they run the 4 x 15's in GG.. with screen and grids
all bonded to chassis ? If they need 15 kw to drive em....
heck.. why not just grid drive em ???

No... lol.

You would think so... But they don't. Grid driven.

There are really two 'builders' of 4CX boxes that actually keep them grid driven.

One, he knows what he's doing, and his boxes are pieces of art.

The other, the only reason his Chi town built boxes aren't more wideband oscillators is because he can't get any type of spaghetti rats nest out of them. The layout is SO poor they won't support self oscillation. (that's the box in question here, BTW).

### BTW... I had a call from Arnold Howell not too long ago....
IF any of ur 11m buddy's require YC-243's... [ Eimac
SOCKETLESS version of a 3CX-6000A7 / YU-148] lemme now asap....
if he gets enough interest.... he's gonna get Eimac to do a small
production run.... BUT he won't do it unless at least 10 x tubes
are ordered.

I've already sent some email's out. Can't guarantee anything, but I'll see what I can do.

Any idea on what out the door price will be? I have a YC-156 project coming up that might be scrapped due to the enlightenment of this new tube / cooling tower. :)

One of the gentleman I sent said email to builds custom 1x and 2x 6K boxes. I'm <<thinkin>> he might jump on this, but.. You know how 11 meter people are :) lol

### The YC-243 is slick.... comes with a built in 4.25" diam grid
flange vs the 4" diam grid ring on the socketed version. The
fil assy is solid silver plated bar stock.... with two huge
threaded bolts pointed straight down, embedded in the bar stock.

I'm going to take a nice hard look at it.

If you would have said something 2 months ago, I might have ordered all 10 of them myself. Instead the wife says all monies at this point go towards house purchase. Damn family obligations :) At least I get a dedicated 10X12 ham room at the new house ;) Detached and all :)

### Just whack a hole in chassis... and bolt grid flange [ 1/8"
thick] to chassis with 12 x 1/4-20 bolts. All silver plated..
a real thing of beauty.

Sounds good... Kind of like what the YC156 should have been (what WHERE they thinking with the grid structure in that tube?)

### Economy Electronics doesn't sell em anymore either... and
it's Howell's design.

There was another "one off" tube being offered that I can't remember the name of.. It was a YC tube as well, but was the "solid state" replacement for the 3-500Z. Offered 1600 watts of plate dissipation, as I remember.

Reminded me of Kenny in San Diego and his dual 1200A7 modified L4Bs and Henry's. Nice desktop 5K units :).... I just wondered what the intelligence was behind building amps based on one off tubes.

I'm assuming these YC-243s are rebuildable, since they are basically one off designs?

### They sell for LESS than a standard socketed 3CX-6000A7... and
now that the sockets from RF parts are up to $375.00.... u save
the cost of the socket as well.

The price of tube sockets is like gas, cigarettes and sex. People will spend because they have to.

And nobody wants to tell Eimac they are doing us a disservice by NOT incorporating a socket into every tube they build.

Any other thoughts on that? My take was it's a lot more stable amp with not having a socket, as long as you get a GOOD connection ALL THE WAY around the bolt in grid flanges? Not to mention, I always liked having bolt together connections, instead of finger stock, on my 160A filaments :)

### If anybody wants the Official Eimac PDF file on this YC-243..
lemme know. I'll send it to you. Next week, I'll see if I can
post the PDF file on the "files" link .. just above .."photo's"



### I came up with a way better chimney scheme than either the
Economy Electronics grey chimeny.. or Hoewll's Teflon chimney
[which is 1/4" thick solid Teflon.. and weighs a ton].

### We built a 9.5" square box around the base of the tube... and
used the original chimney in a recessed groove on top of box.
Using a Dayton 5C508 blower.. we could get an easy 320 cfm out
the top of the tube. [at .9" h2o pressure] With a 20 deg C [68
deg F] inlet air temp.... the anode diss is 9700 W CCS !

### The whole secret was the 9.5" square box. That allows plenty
of holes in chassis. The ceramic stem on the both a 3x3 and a
3x6 is small in diam.. compared to say a YC-156, etc... and there
is plenty of intake surface fin area on the underside of a 3x6.

### The latest version uses a taller box... and a solid Teflon
top.. with a 6.125" hole in it......... eliminating the aftermarket
chimney's alltogether.

### The stock aftermarket straight up/down chimney's restricted
the airflow like crazy.... due to the smaller holes u could cut in
the chassis cuz of the smaller ID of the chimney's. They were
also too big an ID... letting even more air escape on the outside
of the tube.

I've already called someone working on a single 3x3K dring a 3x20K amp. He is going to try testing out your cooling method on his 3x3 amp, and if it works as well as it looks / claimed, he's also going to try it on the 3x20k amp.

Plate dissipation increases are always nice :)

### You can see all 50+ pix of this on the photo page . Click
on "photo's".... then "VE7RF" [it's the photo album with the
25 kw CD slug. ]

I will.

I've got a pic of a dual 15000 box being put together. The "owner" wants no "fame", so to speak, but if I can get him to let me put it up I will.


--Toll_Free

Later.... Jim VE7RF

--



*Ratings are for transistors, tubes have guidelines*

ORIGINAL MESSAGE:

On Sat, 13 Jan 2007 01:23:18 -0000, "pentalab" <jim.thomson@...>
wrote:

### Dunno where the 11m term "pill" came from.

------------ REPLY FOLLOWS ------------

"Transistor" has more syllables than are allowed on 11 meters. :-)

Bill, W6WRT

ORIGINAL MESSAGE:

On Fri, 12 Jan 2007 18:50:49 -0500, Tony King - W4ZT
<w4zt2007@...> wrote:

Q signals belong on CW... that's why they were invented ;)

------------ REPLY FOLLOWS ------------

Not on RTTY?

Bill, W6WRT

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the ham_amplifiers
group.

File : /YC-243.pdf
Uploaded by : pentalab <jim.thomson@...>
Description : Eimac YC-243 data sheets. [Socketless 3CX-6000A7 / YUI-148]

You can access this file at the URL:


To learn more about file sharing for your group, please visit:


Regards,

pentalab <jim.thomson@...>