[Amps] 1625

[Carl]

And when you were able to afford real tubes the 813's took 3KV without 
complaint. Many are now running them on AM at that voltage but I wimped 
out at 2500 with the 4 holer.

Carl
KM1H


----- Original Message ----- 
From: "Paul Kraemer" <elespe at lisco.com>
To: <gzook at yahoo.com>; "'Colin Lamb'" <k7fm at teleport.com>; 
<amps at contesting.com>; "Rex Lint" <rex at lint.mv.com>
Sent: Thursday, February 12, 2009 6:30 PM
Subject: Re: [Amps] 1625


> We musta been a rebelious crowd Glen
> Look at what WRL used on the plates of the EL34's in a LA-1 linear to 
> get
> 400 watts
> PH kind of same way calling (4) 1625's an 800 watt linear. That was no 
> small
> hv supply in there either.
> Most guys I knew were way over 2kv on (4) 811's
> Tubes and a lot of other things were cheaper then!
> Paul K0UYA
> ----- Original Message ----- 
> From: "Glen Zook" <gzook at yahoo.com>
> To: "'Colin Lamb'" <k7fm at teleport.com>; <amps at contesting.com>; "Rex 
> Lint"
> <rex at lint.mv.com>
> Sent: Thursday, February 12, 2009 5:19 PM
> Subject: Re: [Amps] 1625
>
>
>> The "olde tymers" used to tell me of running like 1000 volts on the 
>> plate
>> of a 6L6.  According to them, you had to send code pretty fast 
>> because a
>> short "dash" turned the plate red and a long "dash" melted it!
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>> --- On Thu, 2/12/09, Rex Lint <rex at lint.mv.com> wrote:
>>
>> The max rating for a 6AG7 is 300 V, so you ran them at 3.3 the max
>> voltage! It must be one tough tube.  The plate dissapation is 9 
>> watts, so
>> 4*9 = 36 watts, and if you pegged the 200 ma meter, the input was 200
>> watts, so you were probably dissapating >66 watts - about twice their
>> rating.  I'll bet they WERE red!
>>
>> Water cooled?
>>
>> I ran a heathkit AT-1 that used one for an oscillator, then used a 
>> 6L6 for
>> the amp.  All told, about 30 watts!  If I'd only known....
>>
>> But that was in the '50's
>>
>>
>>
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>>
>
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