tube failure

Posted by Ralph (M) on April 18, 2012 at 09:12:07

In Reply to: RE: Check the power tubes next posted by djm1969 on April 17, 2012 at 18:20:37:

The 6AS7Gs just seem to arc on their own. So far we have yet to encounter a problem in an amplifier that causes the tubes to arc.

Stay away from 6AS7As and GAs. They don't seem to hold up well.

If you have a cap bulging, it is indeed time for replacement. But I would consider changing the lot of them rather than just the one. We've not used that value in a while- so I am thinking that this amp is about 15 years old. If one cap is already failing, the rest can't be too far behind. If one cap is bad in the output section and the rest are 'ok', it would cause the amp to hum. These days the value we use is 2200uf rather than 1600uf. If nothing else it will sound better with the increased value.

There are a lot of updates available too! If you have us update the amp to the latest level, the warranty reactivates.

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Follow Ups Full Thread

Topic - Atma-sphere m 60 mkII no sound - djm1969 15:41:38 04/16/12 (13)

RE: Atma-sphere m 60 mkII no sound - acres verde 08:53:44 04/20/12 (1)

RE: Atma-sphere m 60 mkII no sound - djm1969 22:16:19 04/20/12 (0)

RE: Atma-sphere m 60 mkII no sound - tyu 15:04:17 04/17/12 (0)

Did you check the fuses with a meter? - Ralph 18:39:54 04/16/12 (9)

RE: Did you check the fuses with a meter? - djm1969 06:56:10 04/17/12 (8)

Check the power tubes next - Ralph 12:07:59 04/17/12 (7)

RE: Check the power tubes next - djm1969 18:20:37 04/17/12 (6)

tube failure - Ralph 09:12:07 04/18/12 (4)

RE: tube failure - roscoeiii 12:28:33 04/18/12 (3)

The tubes can't arc during pre-conditiong as there is no B+ nt - Ralph 10:00:59 04/19/12 (1)

RE: The tubes can't arc during pre-conditiong as there is no B+ nt - roscoeiii 10:21:55 04/19/12 (0)

RE: tube failure - djm1969 16:57:41 04/18/12 (0)

RE: Check the power tubes next - tyu 05:32:38 04/18/12 (0)

Follow Ups

tube failure - Ralph 09:12:07 04/18/12 (4)

RE: tube failure - roscoeiii 12:28:33 04/18/12 (3)

The tubes can't arc during pre-conditiong as there is no B+ nt - Ralph 10:00:59 04/19/12 (1)

RE: The tubes can't arc during pre-conditiong as there is no B+ nt - roscoeiii 10:21:55 04/19/12 (0)

RE: tube failure - djm1969 16:57:41 04/18/12 (0)

tube failure

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