Tubes Asylum

RE: Curious

23.125.184.79

Steve O

In Reply to: RE: FWIW... posted by Rod M on August 21, 2023 at 18:01:16

The original MC30 didn't use 12AT7s, only 12AX7, 12AU7 and 12BH7. In what position(s) are you using the T7s?

Follow Ups:

RE: Curious - Rod M 06:44:07 08/22/23 (0)
Oops, next time I'll check the small print with my reading glasses on. you are correct, I was looking at the 12AX7.

-Rod
RE: Curious - dgaapc7 05:53:54 08/22/23 (3)
Call me ignorant. Two per channel but I don't really know their role in the circuits.
LowIQ
- RE: Curious - Rod M 06:47:54 08/22/23 (2)
  Here's some info:
  
  Tube Compliment
  3 - 12AX7A Input and Phase Inverter
  4 - 12AT7 Voltage Amplifier and Driver
  4 - KT88/6550 Power Output
  
  -Rod
  - https://www.mcintoshlabs.com/-/media/Files/mcintoshlabs/Docu (Open in New Window)
  - RE: Curious - Tre' 16:40:20 09/03/23 (1)
    I'm seeing 1/2 a 12ax7 input gain stage (V1), a 12au7 phase inverter(V2), a 12bh7 driver (V3) and a 12az7 cathode follower (V4) per channel.
    
    Tre'
    Have Fun and Enjoy the Music
    "Still Working the Problem"
    - http://www.tubebooks.org/file_downloads/McIntosh/MC275_sch.p (Open in New Window)
    - I had no idea, the new ones are a completely different circuit. - Tre' 16:42:35 09/03/23 (0)
      .
      Have Fun and Enjoy the Music
      "Still Working the Problem"
      https://www.drtube.com/schematics/mcintosh/mc275-mk4-service (Open in New Window)

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