Re: Method to track down hum and tube crackle - mark

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OTL, Output Transformerless Amplifier User Group.

Re: Method to track down hum and tube crackle

Posted by mark on February 4, 2001 at 07:20:49

In Reply to: Method to track down hum and tube crackle posted by Rush Paul on February 3, 2001 at 18:59:35:

It may not be easy help here, but I'll try. I'll need to ask a good many questions and try and head the right direction. I hope one one your amps wasn't damaged during shipping. No, you can't assume you have a bad tube, but it is possible. So, let's concentrate on the misbehaving amp. Have you popped the bottom cover to look for anything that looks suspiciously loose or out of place compared to the good amp? Such visual inspection can be very helpful, but not often easy. Is the bias stable? Is the offset voltage stable? You'll probably want to use an external meter to look at the offset voltage. Have you swapped any driver tubes between the two amps and did the problem then transfer it into the other amp? Do you have access to a good scope? Do you live in Southern California?

Please forgive all the questions. I know it's hard to be patient with all this when you're so close to sonic bliss.

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Follow Ups Full Thread

Topic - Method to track down hum and tube crackle - Rush Paul 18:59:35 02/03/01 (7)

Re: Method to track down hum and tube crackle - mark 07:20:49 02/04/01 (6)

Re: Method to track down hum and tube crackle - Rush Paul 09:23:14 02/04/01 (5)

Re: Method to track down hum and tube crackle - Rush Paul 10:20:47 02/04/01 (4)

Re: Method to track down hum and tube crackle - Rush Paul 11:06:34 02/04/01 (3)

Re: Mechanical buzz from transformers - Rush Paul 18:09:10 02/05/01 (2)

Re: Mechanical buzz from transformers - Lew 08:15:35 02/06/01 (1)

Re: Mechanical buzz from transformers - Rush Paul 11:07:28 02/06/01 (0)

Follow Ups

Re: Method to track down hum and tube crackle - mark 07:20:49 02/04/01 (6)

Re: Method to track down hum and tube crackle - Rush Paul 09:23:14 02/04/01 (5)

Re: Method to track down hum and tube crackle - Rush Paul 10:20:47 02/04/01 (4)

Re: Method to track down hum and tube crackle - Rush Paul 11:06:34 02/04/01 (3)

Re: Mechanical buzz from transformers - Rush Paul 18:09:10 02/05/01 (2)

Re: Mechanical buzz from transformers - Lew 08:15:35 02/06/01 (1)

Re: Mechanical buzz from transformers - Rush Paul 11:07:28 02/06/01 (0)

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