[TenTec] 1999 Centurion amplifier - grid goes negative/output goes to zero

[Stan Gammons]

Sounds like one of tubes shorted. If they are still under warranty, I'd contact RF Parts and see what they say.  They replaced a tube I had that shorted.


73

Stan
KM4HQE


On March 9, 2018 11:11:45 AM CST, Bob  <w3hkk at roadrunner.com> wrote:
>Bought this  used  from an estate sale in 2014.  Worked great for 3
>yrs. Then a tube short blew a fuse.  Replaced both finals  and all was
>well until a few months ago. The  amp  worked well for a few
>transmissions, then the output went to zero.  After a few  cycles of
>this I noticed the grid current which rested at zero began to migrate
>negative.  As it   got worse, the output dropped to nil.
>
>One suggestion was that one of my new tubes  ( from RF parts)   is
>failing.  Another was  a possible problem in the AGC circuit.  
>
>Other suggestions?  Also, I may need  a repair tech and don’t want to
>ship the amp, so someone in Ohio or driving distance from central OH
>would  be a plus.
>
>Thanks.
>
>Sent from Mail for Windows 10
>
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