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RE: Dynaco 400 amplifier problems,

Once again, GP49, I have yet to replace anything on any of these amps at this time, but I thought I'd share with you some of the parts replacements that came with the kits. On PC-28 boards, Q1,2 and 3, originally 2N4889's, are now 2N5401's, Q4,5 and 6, originally 2N3440's, remain the same, as does Q7, a 2N5415, also Q8 and 11, BC308B's, I got BC307B's, Q9 and 10, originally SE6020A's, now TN3019A's, Q12 and 13, still TIP41c's, Q14 and 15, still TIP42C's, and diodes appear to be the same, D5 listed in kit as 1N5244B, other diodes as 1N4148, which is what I find in Dynaco parts list. I'm also considering redrilling the heat sink to double the number of output transistors, as the 416 (and some 400's were done, even though I know this could be a problem.
Mark

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