[TenTec] Centurion Amp QSK Board

[Bob McGraw - K4TAX]

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 at cfl.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec at 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 at 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 at cfl.rr.com>
>> To: <tentec at 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,
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