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In Reply to: RE: Help with troubleshooting Ming Da MC34-AII posted by Sidewinder on July 03, 2015 at 17:12:04
mt
Follow Ups:
No, I didn't. The bad resistor was open, but after installing the new 210k resistor, both channel's plate resistor measure the same-about 210k ohms. I've been playing music through this amp for about 3 hours now and everything seems to be fine. So, should I leave it as is or change the resistors to 100k as indicated in the color code and schematic?
David
I'd leave the resistance value at whatever was in the amp --- as long as the amp was working well. Value of this resistor effects the bias of the tube. And the overall quality and balance of the music.
Edits: 07/04/15
Thanks. I think I'll take your advice and leave it as is. It's been running for about 10 hours now and it still sounds good. Any thoughts on the use of a slow-blow fuse instead of the fast acting one?
Regards,
David
I was kinda puzzled at the manufacturer's use of fast-blow fuse. Tube amps are notorious for blowing out fast-blows, esp on cold startups.
You should email them, to be sure that it is safe to go to Slo-blo.
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