that's right Jim , at the qrl we have been used an RF amp with a couple
7527A's for industrial use .
They are the same as the 4-400 and each year we "pull" them out the amp .
The amp is never been tuned on full
power , he's been used on 500 watts .
and gess what they are doing with them ???? yep trash .......
Untill there was a ham ( that wass i ) passing . and now each year the pulls
are mine .
A few weeks it was even nicer : i have the pulls , i have a pair brand-new
tubes , and next year i will have the complete
amp . He will be replaced for an solid state amp .
The amp is an HFS1000D RFPP .(no not with an 3CX........ but 4_400's)
73 de on5km stef
> I think you'll find that the RCA 1kw AM rig ran two 4-400's modulated by
> two 4-400's. They lasted about a year in CCS before starting to
> need extra drive to get the output, and for the distortion to start
> climbing. Back when I was paying for college, it was routine to put in
new
> jugs before doing the annual proof of performance.
>
> Pulls made great lamps for the ham shack, btw.
>
> Jim Jarvis, N2EA
>
>
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