[Amps] Life and gain of 3-500Z

[Peter Voelpel]

Rich,

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

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?