In Reply to: Are all the power tubes OK? posted by Ralph on September 25, 2015 at 10:29:26:
I tested all the power tubes with my Hickok tube tester to make sure no shorts or grid leakage are present and even matched the tubes so that one bank of power tubes has equal readings to the other bank of tubes. Will the visual inspection matter after that? I replaced three tubes that tested poorly to ones that tested well and can test them again to see if they died after being put in circuit. Not really sure why the soft sound or if it even has anything to do with the DC offset issue.
I guess I can also retest the 6sn7 tubes to make sure they are still good. Mine has two banks 6 power tubes per bank and five 6sn7 tubes in a row starting by the power plug which is where the DC offset meter is and headed across the back from left to right. Are these tubes set up to be top and bottoms of a circuit where one has a greater effect on sound? Just casting things at the wall at this point.
Thanks,
Charles
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Follow Ups
- RE: Are all the power tubes OK? - ChasLieb 13:52:30 09/25/15 (12)
- OK- its an older 12-tube model - Ralph 14:10:27 09/25/15 (11)
- RE: OK- its an older 12-tube model - ChasLieb 14:34:03 09/25/15 (10)
- RE: OK- its an older 12-tube model - Ralph 13:17:23 09/28/15 (9)
- RE: OK- its an older 12-tube model - ChasLieb 18:42:31 09/28/15 (8)
- RE: OK- its an older 12-tube model - ChasLieb 18:52:46 09/28/15 (7)
- All the 6SN7s must be in place and as many of the power tubes as possible. - Ralph 09:28:56 09/29/15 (4)
- RE: Somehow it involved a fuse - ChasLieb 17:16:52 09/29/15 (3)
- RE: Somehow it involved a fuse - Ralph 18:29:25 09/29/15 (2)
- RE: Somehow it involved a fuse - ChasLieb 19:01:39 09/29/15 (1)
- RE: Somehow it involved a fuse - Ralph 10:02:22 10/01/15 (0)
- RE: OK- its an older 12-tube model - Lew 06:42:09 09/29/15 (0)
- RE: OK- tested the grid voltages on all 6as7 sockets - ChasLieb 19:05:35 09/28/15 (0)