[TenTec] TT 422 Blowing Fuses

[Bob McGraw - K4TAX]

Yes there are 3 relays on the HV board which serve to turn on the HV and 
provide a soft start.  However, in my two amps, the HV is applied when the 
power switch is turned on.  Maybe an earlier design to which I've not seen 
or familiar.

73
Bob, K4TAX


----- Original Message ----- 
From: "Bry Carling" <bcarling at cfl.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Sunday, February 02, 2014 8:03 PM
Subject: Re: [TenTec] TT 422 Blowing Fuses


> Well if you like I can scan the manual pages and schematic of my 422 
> Centurion. It is exactly as I described to you. HV Board has 3 relays. One 
> is for soft start, and the other two apply 240v AC to the HV Transformer 
> only when the standby switch us turned to Operate position.
>
> Sorry but that IS what I have. Maybe mine is an older version of the 
> amplifier.
>
> Best regards - Bry Carling
>
>
>
>> On Feb 2, 2014, at 8:28 PM, "Robb Urie" <rurie at bajabb.com> wrote:
>>
>>> On 2/2/2014 2:03 PM, Bry Carling wrote:
>>> Nope. The power switch only sends power to pilot lamps and filaments on 
>>> mine. The standby switch energizes relays that apply primary power up 
>>> the HV transformer.
>>
>>
>> Then this amp is certainly not stock...High voltage is applied via the 
>> high voltage rectifier board 81538, there are no relays in the original 
>> design.  Perhaps the ham who sold it to you modified it without either 
>> documenting it or failing to tell you.  Before complaining about poor 
>> quality transformers from Ten Tec, maybe a better understanding of 
>> exactly what your amp really is would have been better.
>>
>> Your original post did state "Only blows the fuse when switched to 
>> operate" caught my attention.  I also found that strange, but did not 
>> respond as you seemed to have found the primary shorted.  I have had two 
>> 422's, a late one that went "Bang" resulting in a new set of HV caps and 
>> an early model that seems to be working just fine.  At one time, the 422 
>> was a good value, but now at the current price point I would have to look 
>> elsewhere if I was in the market.
>>
>> Keep us posted when you get your transformer back.
>>
>> 73,
>>
>> Robb N0RU
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