Dynaco 400 amplifier problems,

Posted by daveyhockett (A) on February 21, 2012 at 05:50:18

Hello, I a new to this forum and I would appreciate any help you may give me regarding a problem I have with the above amplifier.

I have acquired a Dynaco 400 stereo amplifier and it has some problems. Upon pulling off the top cage cover and before plugging it in to my dim bulb tester I noticed it had a transistor that was hanging off the PC-29 board on the very top by one metal leg only. I looked at the service manual and it was labeled Q6 on page 39. Upon searching for the part number I could not find it listed. Then I noticed on the schematics of the board in small print it stated "PC-29 Add 100 to all component numbers". I searched again and on page 23 found the number Q106 a transistor MPSU56 and the part number 567043.

Am I correct in assuming this is the correct transistor to replace the one that is hanging off? There are no numbers on the one in the amp. I really can't go any further until I replace this part. I also plan on re-capping it.

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Topic - Dynaco 400 amplifier problems, - daveyhockett 05:50:18 02/21/12 (18)

RE: Dynaco 400 amplifier problems, - GP49 08:54:58 02/21/12 (17)

RE: Dynaco 400 amplifier problems, - daveyhockett 05:38:17 02/22/12 (16)

RE: Dynaco 400 amplifier problems, - GP49 06:57:23 02/22/12 (15)

RE: Dynaco 400 amplifier problems, - daveyhockett@comcast.net 07:04:29 02/22/12 (14)

RE: Dynaco 400 amplifier problems, - GP49 07:08:46 02/22/12 (13)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 15:45:36 02/22/12 (12)

RE: Dynaco 400 amplifier problems, - GP49 16:16:38 02/22/12 (11)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 08:59:28 02/23/12 (10)

RE: Dynaco 400 amplifier problems, - GP49 09:18:06 02/23/12 (9)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 16:23:01 02/23/12 (8)

RE: Dynaco 400 amplifier problems, - GP49 16:34:15 02/23/12 (7)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 11:16:56 02/24/12 (6)

RE: Dynaco 400 amplifier problems, - GP49 13:49:36 02/24/12 (5)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 09:05:14 02/25/12 (4)

RE: Dynaco 400 amplifier problems, - GP49 09:53:51 02/25/12 (3)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 17:00:14 02/26/12 (2)

RE: Dynaco 400 amplifier problems, - GP49 19:56:53 02/26/12 (1)

RE: Dynaco 400 amplifier problems, - macs348hemi@yahoo.com 09:33:51 02/27/12 (0)

Dynaco 400 amplifier problems,

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