--- In ham_amplifiers@..., "Harold Mandel" <ka1xo@...>
wrote:

Sirs,



Only a rotating armature easily produces a sine wave.

Hals correct. An alternator less the rectifier stack produces the
best sine wave possible. It is as pure an AC 3 phase current as
delivered by the power company.

Most inverters produce either a square wave or a modified (quasi-
sine) sine wave. The quasi-sine wave is actually a square wave but is
in a stair step fashion where the steps would fit within the arc of
of 1/2 of a sine wave. The negative cycle is a mirror image of the
positive 1/2 cycle. Of course a pure square wave is merely like the
on and off function of flipping a switch. The quasi-wave has to have
a wave shaping circuit. It supposed to match a sine wave more closely
which in turn goes into figuring the power transformers
specifications. The transformers form factor is what changes over
this. For mobile use, a transformer ran from an alternator or other
AC source uses 4.44 for the form factor where a square wave uses 4.0.
The form factor is figured from the rms and average values of a sine
wave (4 x 1.11 = 4.44). I can't remember what the quasi-square wave
uses.

The old sweep tube mobile amps used square wave switching supplies
with several different transformer schemes. The old automobile radios
used this too. The first ones used vibrators, then they switched to
solid state square wave inverters. These are not hard to design as
the transformer itself is what determines the oscillation frequency.
The primary is two 12V windings. The transistor switching windings
supply around 3 to 5 vdc to the base of the switching transistors.
The secondary is designed like any other. Theoretically, one could
get by without a filter C on the output of the bridge rectifier on
the secondary since it's a square wave, but that's not a good idea.

Most inverters produce square waves, but some expensive types

produce a "modified sine wave."



If you were to visit a power plant you will see the main dynamo is

a D.C. generator that energizes a set of rotary alternators,

spinning

at 60 Hertz in America and at 25 Hertz in the subways of NYC..

There was some 40 Hz used up there somewhere, but I heard the last of
it was finally torn out and replaced with 60 Hz. It was an old hydro
plant somewhere, maybe Niagra?

Hal Mandel

W4HBM



_____

From: ham_amplifiers@...

[mailto:ham_amplifiers@...]

On Behalf Of Robert B. Bonner
Sent: Monday, January 15, 2007 5:15 PM
To: ham_amplifiers@...
Subject: RE: [ham_amplifiers] hi power mobile



I was looking this over, I noticed it is 50 Hz power. Dometic

sells massive

quantities of product in the USA. I have some of it on my RV.



The 7KW unit is not that small, look at the photos it is a HV 3

Phase at

least 230V alternator the size of a 200 AMP 12V unit.



The "BOX" is a inverter or external regulator. They say it

provides solid

sine wave power. SO you wont get that from a spinning alternator,

so it is

electrically making the sine wave in the box.



Where's 60 CYCLE???? I'd buy one. I mean I suppose I could use 50

HZ power

but really.?



BOB DD



_____

From: ham_amplifiers@...

[mailto:ham_amplifiers@...]

On Behalf Of PA3DUV
Sent: Monday, January 15, 2007 3:43 PM
To: ham_amplifiers@...
Subject: [Norton AntiSpam] [ham_amplifiers] hi power mobile



This looks like the solution:



.
<>
com/templates/ProductCategory.aspx?id=1420



The 7 kW version really appeals to me.

Although too small to reach my final goal (10 kW out /m) ist brings

me a

good step further.

Amazing how they squeeze 7 kW out of a compact alternator.



Cheers, Dick

PA3DUV

Best,

Will

A fellow from another BB asked the seller about it. He said that there is no
way that "thing" is going to pump out 36KW. She told him he was not
qualified to make that statement and that question and his bid would be
rejected!
Mod-U-Lator,
Mike(y)
W3SLK

--- In ham_amplifiers@..., "RICHARD GEORGE" <k6kwq@...>
wrote:

Speaking of coax, look at the piece that runs from the loading cap

to the relay. This stuff may be good for 300 watts or so not 10kw.

### agreed... UNLESS it's RG-393... which is a tiny bit smaller
OD than RG-213 .390" vs .405"

## The kicker is.... the braid is NOT bonded to chassis at the load
cap end.... so he's gonna end up with a gross Z bump. That alone
puts the load cap at a HIGH Z point... with it's peak V across the
load cap sky high.

## The other common mistake on these 11m amps is using some simple
strap / wire from load cap to t/r relay... same deal... gross Z
bump.. plus the tiny bit of uh in the wire... now makes the PI-net
into a PI-L net. That again puts the load cap at a high Z point..
with lotsa peak V across it.

### Don't laff... I was told by several of these 11m builders.. that
a 5 kv vac load cap will arc across... and that a 10 kv rated vac
load cap is needed... which is pure nonsense of course.

### Turns out what most of em do is tune the amp up full bore
with a dead cxr........ THEN switch to AM !! Of course the PEP
output of the xcvr is 4-5 times the unmodulated cxr output.

### The 10 kw unmodulated output amp... when switched to AM.. is
now trying to put out 40-50 kw pep... gags.. and flat tops. On an
AVERAGE reading wattmeter.. meter will deflect backwards. These
guys tell me at that point... they back the drive down a bit.. till
meter starts deflecting upwards a tiny bit!

### Then they wonder why they arc 5 kv rated vac load caps !

### A YC-243 / 3x 6 is good for 12-14 kw pep output. You
pulse tune it for 12-14 kw pep output.... THEN... when u switch to
AM.... tweak drive so u have 3 kw of cxr. Then with a PEP
reading wattmeter.... while modulating... pep output will be 12-14
kw pep........ and unmodulated it's 3 kw cxr.

### The above scenario is assuming you are trying to run an amp as
a class AB-2 GG LINEAR. The amp has to be LINEAR. Run it class
B/C... and it's gonna sound like crap.

## same deal with a SB-220. Tune it for 1200-1400w pep.
Unmodulated cxr should be 300 w .

### That giant P+b mech relay in that 11m amp isn't gonna run vox
anytime soon either.

### probably what the fellow meant to say was 3.6 or 3.8 kv...
not 36-38 kv. He could barely string 3 words together... never
mind spell.

Later.... Jim VE7RF

开云体育

On Mon, 15 Jan 2007 14:15:15 -0800, Robert B. Bonner <rbonner@...>
wrote:

I was looking this over, I noticed it is 50 Hz power. Dometic sells
massive
quantities of product in the USA. I have some of it on my RV.


The 7KW unit is not that small, look at the photos it is a HV 3 Phase at
least 230V alternator the size of a 200 AMP 12V unit.

It looks just like the "ambulance package" 200A rated alternators we use
on CB.

However, I've never seen one hold an honest 200A at 14.4. More like 180
or so.

That's on a freshly rebuilt alternator, cold case. At full steam (heat),
they dropped to about 150.

The "BOX" is a inverter or external regulator. They say it provides
solid
sine wave power. SO you wont get that from a spinning alternator, so it
is
electrically making the sine wave in the box.

Sounds like a SOLA power conditioner from Fair Radio Sales.

Where's 60 CYCLE???? I'd buy one. I mean I suppose I could use 50 HZ
power
but really.?

ZZZZZZZZZZZZ And I'm not talkin about the wife and her snoring :)


(lived in a 5th wheel traveling the US for 2 1/2 years when I was growing
up.. Fun, but got tiring.)


--Toll_Free

BOB DD


_____

From: ham_amplifiers@...
[mailto:ham_amplifiers@...]
On Behalf Of PA3DUV
Sent: Monday, January 15, 2007 3:43 PM
To: ham_amplifiers@...
Subject: [Norton AntiSpam] [ham_amplifiers] hi power mobile


This looks like the solution:





The 7 kW version really appeals to me.

Although too small to reach my final goal (10 kW out /m) ist brings me a
good step further.

Amazing how they squeeze 7 kW out of a compact alternator.


Cheers, Dick

PA3DUV

--



*Ratings are for transistors, tubes have guidelines*

Sorry, that isn't what I meant, BG... We had already figured out it was a southern states amplifier duh.....


Was thinking of another reflector when I opened my mouth and inserted my foot... lol.


--Toll_Free

It looks like a BG box from Chicago.


--Toll_Free

--



*Ratings are for transistors, tubes have guidelines*

开云体育

开云体育

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: