[Amps] Weird tubes in an amplifier

[Carl]

I also copied that article in CQ maybe? Used 3 of them also with a 10A into 
the 4 GG modified 1625's that were the in thing for awhile for poor high 
schoolers.

I have no idea what any of the output powers were or the combined IMD but 
they did work 80-15M.

Carl
KM1H


----- Original Message ----- 
From: "Fuqua, Bill L" <wlfuqu00 at uky.edu>
To: "MU 4CX250B" <4cx250b at miamioh.edu>; "William Turner" 
<dezrat1242 at wildblue.net>
Cc: <amps at contesting.com>
Sent: Wednesday, January 29, 2014 2:22 AM
Subject: Re: [Amps] Weird tubes in an amplifier


>  I also ran 4 6AG7s in grounded grid. Slowly conditioned them by raising 
> the plate voltage to
> 1kV. My 200 Watt lamp dummy load got quite hot. I tried one first and then 
> got a large block of
> aluminum that I drilled four 1 inch holes into.  Then using a carbide saw 
> blade that my father had
> on his table saw, I slotted the block to make fins. I mounted it on a 
> chassis with a color TV power
> transformer and voltage doubler. My filter capacitors were some AC run 
> capacitors I got from
> a scrap pile at a heating and air conditioner shop. I only had a few Watts 
> drive from my
> CE10A. I had bandswitched it since it only came with a 80 meter coil set. 
> So my output was
> not coupling was not ideal.
>  It worked well from 80 to 20 meters but could not get much output on 15.
> I still have the heatsink but can't find the rest of it.
> 73
> Bill wa4lav
>
> ________________________________________
> From: Amps [amps-bounces at contesting.com] on behalf of MU 4CX250B 
> [4cx250b at miamioh.edu]
> Sent: Wednesday, January 29, 2014 12:00 AM
> To: William Turner
> Cc: amps at contesting.com
> Subject: Re: [Amps] Weird tubes in an amplifier
>
> When I was a kid I built a linear amp running four 6AG7s, from an
> article in CQ. The author had discovered that the nominal 3W plate
> dissipation of the 6AG7 could be pushed to 100W. The tubes  got
> so hot the black paint blistered. As I recall, the tube life was
> measured in minutes, not hours. (Those were the days when
> Burstein-Applebee sold JAN 1625s for $0.25.) I'm sure some of you guys
> remember the article!
> 73,
> Jim W8ZR
>
> Sent from my iPhone
>
>> On Jan 28, 2014, at 9:50 PM, William Turner <dezrat1242 at wildblue.net> 
>> wrote:
>>
>>
>>> On 1/28/2014 7:24 PM, Mark wrote:
>>> Just when I thought I had heard of almost every type of tube in an 
>>> amplifier
>>
>> Betcha you never saw an amplifier with a 6SJ7 as the final. When I was a 
>> poverty-stricken teenager, that was what I used on 40 meters. Three watts 
>> DC input and I worked the east coast from California. I was so proud I 
>> almost hurt myself smiling.
>>
>> 73, Bill W6WRT
>>
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