[TenTec] Centurion 422E problems

[Carter Grabarczyk]

Guenther,

I had a similar problem with my Centurion when I purchased it used
several years ago. What I found was that Ten Tec had three versions of
the board you describe below. The earlier two versions appeared to be
prone to failure. The latest version I am now using has worked well for
several years now. I would suggest that you send paper mail to TT
requesting that they send you the schematic of the latest version if you
are building it yourself (or purchase the board).

73/Carter/K8VT

Guenther Loebel wrote:
> 
> Hello,

> 
> I also made the modification, so that the tubes are
> not biased in operate-mode without keying.
> 
> I own a copy of a modification, mainly on the filament-AC
> board.
> That worked so far, no current was flowing in operate--mode.
> Now it is again the same thing as original (Approx. 100ma),
> the 3 components, which were installed are still ok and all the
> contacts to (I soldered it again)!
> (MPS-U01 Trasnsitor, 1k 1/4w resistor and a 5W
> zener diode).