[Amps] Life and gain of 3-500Z

[R L Measures]

On Jul 21, 2006, at 2:46 AM, Peter Voelpel wrote:

> Rich,
>
> one of the tubes had a permanent shorted grid-cathode path and the  
> heater
> transformer was burned out

Tnx.  Was it the inboard tube that shorted or the outboard tube?
>
> 73
> Peter
>
> -----Original Message-----
> From: R L Measures [mailto:r at somis.org]
>
>> When I recently repaired a TL-922 for a friend the original tubes
>> where
>> replaced by RFP 3-500ZG.
>> There was no adjustment necessary to the input circuits, if I
>> remember right
>> the idling current in SSB Position was 180mA.
>> The amp was wired for 240V, fed by 235V, of course run at 50Hz.
>> To me the tubes looked pretty hot compared to the QB4/1100 I run in
>> my L4B.
>> I measured 1300W out driven at 90W key down.
>>
>> No idea how it behaves with Eimac tubes as the originals were bad.
>
> What was wrong with them, Peter?
>
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R L MEASURES, AG6K. 805-386-3734
r at somis.org