[TenTec] TT 422 Amp Filiment Transformer Problem?.....reply

[Al Sirois]

Thursday afternoon

1: Could be the mounting screws to the board need to be tightened, they have 
only an intermitent
        ground connection (thermally).

2:  Where you were playing with the wires; maybe the solder joints have 
become (cold soldered)
        and need to be heated up again and re-connected electrically sound.

It's a nice amp, wish I owned it.

Good luck, OM
Al Sirois, N1MHC/nnn0wna
East Boothbay, ME 04544-0002
n1mhc at arrl.net
===========

----- Original Message ----- 
From: <k0bx at arrl.net>
To: <tentec at contesting.com>
Cc: "Joe D." <k0bx at arrl.net>
Sent: Wednesday, July 08, 2009 2:34 PM
Subject: [TenTec] TT 422 Amp Filiment Transformer Problem?


>
> I got a Older TT-422 Amp a few months ago.  Works fine and in good 
> condition.  Then one day I turned it on and nothing light up, that is, no 
> panel lamps, it looked dead.  As I looked around on the amp, I found that 
> the 2 3-500Z's were on?
>
> Reading the manual, it seems that when the amp is turned on, voltage is 
> applied to the filament transformer.  From there, there are two output 
> taps, one go's to the tubes and the other one go's to the QSK Board to 
> provide voltage for the + 12 VDC Supply.
>
> This is where the problem is.  There was no voltage at the connector to 
> the QSK board.  When I played around with the connector and the two wires 
> coming from the filament transformer.  The amp came to life.  I figured 
> the connector on the wires needed a good cleaning which I did.
>
> All worked for a few weeks.  Then it happened again, no voltage to the +12 
> supply.  I left the amp on for a few minutes with only the filament 
> voltage to the tubes on.  Suddenly, the amp came on.  I didn't do 
> anything, I had not open the case.
>
> I suspect the filament transformer has an intermitent in the transformer 
> tap that supplies the voltage to the +12 Volts supply.
>
> I wonder if anyone else has had a problem like this??  The TT-422 amp has 
> been around for a longtime and anything that could go wrong has.
>
> Any help or comments.
>
> Joe K0BX
>
>
> Stop the insanity!
> Please do not add me to any distribution lists (Joke, Stories or Junk) 
> without my permission.
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