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Have an Epiphone EA72 amp. 1965 according to the pots. Everything works good except the standby. Opened it up to find that its bypassed into the direct power. Is there a reason behind somebody doing this? Can I wire it back in and where? I read that it goes by the rectifier tube?.The standby lamp has no wires coming off it either. Not sure where they go. I do have the schem for it. I dont have a lot of knowledge of tube amps, sorry.
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They probably wired around the switch because the switch wasn't working right, and they didn't want to try and find a new switch, or spend the money on one, or go through the hassle of replacing the thing.Education is what you're left with after you have forgotten what you have learned. -
Epiphone EA-72 standby switch
I understand on is AC plus DC and Standby is AC only. What I dont understand is the wiring to the red standby lamp which runs on 6.3v while its in standby. Where is this wired from?Comment
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I don't know, but did this amp come with a single rotary ac/standby switch. Is the panel marked for a rotary switch? Or are there two separate switches like on a Marshall or Fender?Comment
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On-Off-On toggle. Someone disconnected the standby and cut the wires off the red lamp. The only thing I can tell is the white on the green power lamp had another wire clipped off, I guessing it ran over to the standby lamp.Comment
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The schematic for that amp shows a 3 pole, 4 position switch. When they die a lot of people will replace with a on/off toggle or a on/off/on toggle like on your amp. If your switch is a double pole, you can wire it up to be a on/off/standby, but you'll lose the standby light function, unless you get a 3 pole, center off switch.
Hope this helps.
http://www.harpamps.com/gibson/pg_0403.jpgComment
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That makes sense now. Thanks!Comment
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