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