mc30

  1. K

    MC30 Help

    I recaped a MC30 an measured all the resistors. All caps now have correct values with very low ESR and Vloss readings. Now, the amp is playing very nice, powerfull and undistorced. But ... I measured those voltages...and found that the last 12AX7 must have -42V on the grids (pins 2 and 7)...
  2. M

    MC30 60hz hum

    I recently acquired a pair of MC30's. One was original which I replaced caps and rebuilt the PS w/ silicone diode and bias resistor. This MC30 works great. The other MC30 was built by another person with all new caps and resistors. That MC30 has a steady 60hz hum on the speaker output...
  3. P

    6CG7 instead of 12AU7 in MC240 - will I be taxing the transformer?

    I was advised that this mod was safe and have been using an adapter for it but the nagging feeling in me suspects that I will do eventual harm to my 240. I need some hard facts here if anybody has it as to why I should or shouldn't continue. Just playing it all safe!!! Thank you in advance.
  4. angelaudio

    I’ve been told that increasing filter cap values in the MC30 can enhance things like bass response..

    But how exactly does this work? What is going on electromically that allows for this perceived increase in bass, mid or high frequency response? Are there any detrimental effects on other components because of increased filter cap values? Say...200uf instead of 100uf 40uf etc..
  5. angelaudio

    Power cord replacements for MC30’s. To the local hardware store or to the audiophile cable sites?

    Good evening fellow AK’ers. I need to replace the power cords on my MC30’s and again I’m scratching my head wondering whether to just get some by-the-foot cable cord from the local hardware store or go for something higher-end that is geared toward hi-if audio. I did a little research online...
  6. angelaudio

    Looking for another McIntosh MC30 to make a pair. Will any one do?

    Hey fellow Akers I hope you find yourselves well! I recently purchased a single McIntosh MC30 and would like to purchase another to have a stereo setup but I wanted to know if just any other MC30 would be alright? I’m aware of the fact that different tubes and/or different caps will give each...
  7. angelaudio

    McIntosh AE-2 Preamplifier & MC-30 Monoblock

    Hello fellow AK’ers I hope you all find yourselves well. Today I scored some vintage McIntosh tube gear (my first ever tube setup) and I need everyone’s McIntosh wisdom and knowledge to guide me through proper setup to attain proper audio bliss:) First off, the gentleman who sold me these two...
  8. ZeroFks

    MC30 Monoblocks - Speaker reccos

    Hi AK, I'm pretty new to this world but have been diving in head first. I've got a 2100 paired with a C28 and Vienna Acoustics Bach Grands that I'm absolutely loving. I've recently come across MC30 monoblocks that it looks like I can purchase at a price that makes sense to fully restore them...
  9. jaaronb

    Help on McIntosh MC30 rebuild

    i posted this in the Mac forum, but crickets over there so far, so thought I’d post it here. I can delete the original if there’s an issue with duplicates. I picked up a couple of MC30s from separate sellers over the past week and can’t wait to get them up and running. They’re as close in...
  10. sjfloat

    MC30 Restoration - Filter Caps

    What's the best practice for filter cap replacement? I'm also considering an incremental approach, e.g., using axials inside as part of getting it functional and then buying new cans later.
  11. sjfloat

    MC30 Restoration -- Preservation First! (and caps)

    Oh my... I have a couple of MC30s to restore. I don't know when I'll get the opportunity to dive into this. But looking in on them, I was appalled at the extent to which they had degraded. I live in a relatively humid region and my first concern is to clean up the exteriors and take whatever...
  12. CDinMB

    Loud pop as tubes warm up - MC30

    Just received my "excellent condition" flea-bay MC 30s. I love them with the La Scalas but they are a bit less than excellent, besides the two DoA tubes when I start them one generates a VERY loud pop through the speaker about 10 seconds into the warm up. No pops, static or cycling after that...
  13. kjack48230

    I felt the Power of the Dark Side, hence, I grabbed a pair of MC30's to rebuild

    After much deliberation I pulled the trigger on a pair of MC30's. Got them to restore so my first question, who should I go to to get all new caps and resistors? I am mechanically inclined and was a electronic tech back in the service so I know all the pitfalls of not respecting electricity...
  14. 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...
  15. 'New' MC30

    'New' MC30

    First photo of one of my 'new' MC30s (before I dusted off the top plate)!
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