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RE: Dynaco 400 amplifier problems,

Posted by macs348hemi@yahoo.com on February 25, 2012 at 09:05:14:
GP49, as the saying goes, wait, there's more. For the PC-29 boards, the parts list is: Q1, originally an EN3962, replaced with PN4249, Q2, originally an SE4010, replaced with 2N5961 (came with the kit) or BC550B, older version, Q3, not listed in my manual, replaced with BC237A or BC550A (came with the kit), Q4, originally 2N5061, same, Q5, originally FT4356, replaced with TN4033A, Q6, originally 2N4889, replaced with 2N5401 (came with the kit) or MJE172, IC1, originally NE5558, replaced with MC1458N (came with the kit) or MC1558N, IC2 and 3use the same LM301AH. Original D3, a BZ102, no longer available, now use 2 1N4148's. Older version replaces D8 and D10 with 1N5231B, newer version lists replacing D7,D8, D9, D10,D11,D13 and D14 with 1N4148's. More? OK, how about replacing the DB301 with a GBPC 35 A 800V? By the way, the BC550B's are cheap at Mouser.
Mark