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12bh7

  1. C

    MC30 schematic question

    Hello, everyone. First post here. I am rebuilding a pair of MC30s. I am using the instructions from the Mcintosh MacKIT30. In the instructions I can find no mention of a resistor that shows up on the schematic (dated 5.17.60). This is labeled R29, and it is listed as 330kohm. This resistor...
  2. P

    MC240 - 12BH7's - should they have balanced sections or is it not as important in it's application?

    Hi! Just wondering if I can sub in an old RCA black plate that has differing GM readings (perhaps 20% difference) without it affecting the rest of the amp's performance. Also suggestions about tolerances for all the other tubes with respect to each other and their own individual sections would...
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