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In Reply to: Re: question for Eli... posted by Vinnie on April 30, 2007 at 15:14:11:
It's possible that the current comes on all of a sudden because the 6au4 heaters need to get up to a certain voltage before they start to work. I suggest plugging the heater supply in to a separate output (actually, all of the heaters/filaments) and let them warm up for a minute before you start turning up the variac. Odds are, you'll see different behavior.The 3 amps is on the primary side of the big power transformer. Is this the 1450V unit that you mentioned before? That's a turns ratio of something like 1:12, which means that the secondary is delivering something like 3/12 = 250mA. If it's a stereo amp, that's not a lot for 845's. Could be your variac is blowing fuses because it's just not up to the task (assuming the fuse is in the variac.) If it's a monoblock then it might be a lot, especially since you are not up to full operating voltage yet. If that's the case then I would look for a problem somewhere. Is this an amp that you had running good before with a different power supply? What kind of B+ voltage and idle current were you seeing then?
-- Dave
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Follow Ups
- Re: question for Eli... - Dave Cigna 15:47:25 04/30/07 (3)
- Re: question for Eli... - Vinnie 17:58:12 04/30/07 (2)
- Re: question for Eli... - Eli Duttman 20:11:35 04/30/07 (1)
- Re: question for Eli... - Vinnie 03:36:22 05/01/07 (0)
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