[TenTec] Centurion 422

[pfizenmayer]

If you mean 200 ma not 0.2 ma - very likely a blown transistor in the 81537 
FILAMENT_AC board which has the bias regulator transistors and zener on it .

Used to be a 2N3055 and a MPSU101 - and 8.2 v zener.

Later they used a ON Semi MJ15001 instead of the 2N3055 and a MPSW42 for the 
MPSU101.

I suspect you will find the 3055 shorted.

I would replace both after I am in there - only hard part is unsoldering the 
big transformer wire in the eyelet on the board . Rest is easy .

You might want to check cal if there was a big enuff surge - I have had the 
meters get slightly demagnetized and they read low -

Been there - done that - twice - but now have 3.3volt zeners acropss both 
meters so will never happen again .

73 de hank K7HP






----- Original Message ----- 
From: <w7ju at cox.net>
To: <tentec at contesting.com>
Sent: Wednesday, December 15, 2010 3:45 PM
Subject: [TenTec] Centurion 422


>I had a 3 500Z  Gas and blow a line fuse.  Replaced the one tube.  On turn 
>on in standby plate voltage is 3100 but show .2 ma plate current.
> Suggestions?
> Thanks
> Ralph   W7JU
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