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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: Any thoughts on my MC275's snap, crakle and pop? posted by R.B. on November 2, 2002 at 18:12:58:
RB,Probably best to try an isolate the section(s) with the poor contacts.
First: With amp plugged in and speakers attached, no inputs---try slightly giggling each tube to reproduce the noise. If you find one tube replicates the problem---turn the amp off and check the pins of the tube (bent or corroded) and the tightness of the female sockets.
If no tubes will duplicate the problem. Flip the amp over and take off the plate to expose the guts. KEEP THIS IN MIND AT ALL TIMES: HUNDREDS OF VDC! Enough to whack you.
Get ONE cheap all-wooden chopstick. Turn the amp on, speakers connnected. Very low volume (if it has controls). Now, systematically probe the resistors, caps, and all soldered jumpers from the speakers' side of the amp to the input. Include all input jacks and their connections. KEEP THE YOUR LEFT HAND OFF THE CHASSIS (if you are right-handed). You do NOT want to "test the path of least resistance."
Especially, look for poorly soldered or loose ground points.
Be careful, but most of the time this method isolates the culprit(s). There can be more than one poor solder point or bad component, so check the whole enchilada.
Good hunting.
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Follow Ups
- Old chopstick's method - steven oda 08:18:24 11/03/02 (4)
- On the chopstick.... - Sector-7G 17:38:13 11/04/02 (0)
- First place I went - R.B. 05:23:34 11/04/02 (1)
- Re: First place I went - steven oda 13:39:31 11/04/02 (0)
- Re: Old chopstick's method - Steve O 10:50:53 11/03/02 (0)
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