67.160.11.138
In Reply to: RE: Over my head posted by patmcsween on July 01, 2009 at 14:02:22
This board really looks to be made to turn on one transformer (a dedicated filament transformer to warm up the 300B's), then another (the high voltage trasnformer). I see it on the Sophia site that they say
"Q: I have an extremely (3) modded out Dynaco Mark IV style amps that use solid state rectification so there is no 5 volt filament for the rectifier.
A: Not a problem. You can use the relay between power transformer supply secondary winding."
The relay says 240v... The MK-IV has a 720V secondary. This is terrible advice, don't do this in the Paramount! This is some decent advice...
"A: We have used this relay (10A version) in amplifer (550V) without any problem. However, we would recommend you to seek the most efficient way:
1. If you can control the primary (120V AC) instead of secondary (usually high plate DC voltage).
2. You may consider to control the rectifier tube filament. So you would not get turn on jump."
I think the only "good" way to do this would be to switch the HV ground coming off the power supply PCB. I'm sure PJ will chime in on this.
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