Without proper cooling the current through the tube filament pins will
likely melt the solder from the pins thus tube failure is imminent. Take the
pot out of the fan circuit as it can inhibit the fan starting and thus one
can expect a cooling failure.
73
Bob, K4TAX
----- Original Message -----
From: "Brian Carling" <bcarling@cfl.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Sunday, March 16, 2014 9:36 PM
Subject: Re: [TenTec] Centurion Amp QSK Board
Yes and the good news is my Centurion is up and running after I replaced
the two chips on the QSK board today.
However the fan still won't run so I need to fix that before using it any
more.
I always used proper tuning but perhaps the fan failed and caused this.
Either that or something came loose during the repair. Mine has had a pot
added to the fan circuit.
Best regards - Bry Carling
On Mar 16, 2014, at 9:54 PM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net>
wrote:
I, on the other hand, purchased my Centurion new in 1991. Sold it last
year still with the original transformer, QSK board and tubes and making
1200 to 1500 watts out. No failures and it acquired several thousand
hours of operation. I deem that proper tuning is the key to success and
longevity.
While the AL-82 is a good, no very good amp but it does not offer the
slick and full QSK of the Centurion, unless one adds the QSK-5 kit. I
considered the QSK-5 kit with my new AL-80B but decided against it. I
elected to go another route.
73
Bob, K4TAX
----- Original Message ----- From: <bcarling@cfl.rr.com>
To: <tentec@contesting.com>
Sent: Sunday, March 16, 2014 8:59 AM
Subject: Re: [TenTec] Centurion Amp QSK Board
Thanks Don - I will call them tomorrow and buy the kit. Or find those 5
parts on the web.
This QSK board was already replaced once by the previous owner.
It seems to be the other one of two very weak links in the design of
Tentec amplifiers.
Power transformer and QSK board..
I love it when my 422 works right, but if I had it to do over I would
have bought an AL-82
or something similar.
73 - Bry
On 15 Mar 2014 at 22:09, Donald, K6RV wrote:
Bry,
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|