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mc225

  1. Basspig

    McIntosh MC225 60Hz Buzz, Vol at Min, No Inputs

    Got a mystery problem here. MC225 amp, all new tubes, s/n A-weighted, left channel 80dB, right channel 72dB. Audible 60hz buzz with nothing connected to the inputs and volumes at minimum. Tried the filament circuit modification (ungrounding one side and putting 220Ω balanced resistors across...
  2. oldmustang

    MC225: EL84 with adapter instead of 7591?

    I was looking at what is available in the way of 7591s for my MC225 at Tube Depot today and they had this listing: https://www.tubedepot.com/products/yj7591-el84-to-7591-adapter I'm not dissatisfied with the new manufacture Tung Sol 7591s I'm currently running, and I have a set of NOS with...
  3. J

    Need MC225 help

    I am trying to refurbish my mc225. It's been around the block a few times, being hauled around Texas where I worked until retirement, and in the studio and on the road. Most of the voltages are within 10%. In fact, both plates of the 7025 which is used in the place of the circuit's 12AX7, are...
  4. M

    Severe Sound Distortion from MC225

    Hi, a total newbie here. I hope you are all well. I have a MC225 which I bought about 25+ years ago. I hadn't used it much in the past. Like many people, I started listening more during the pandemic. Everything was fine until a year ago. One day, all of sudden, the sound got very...
    • Mil Gnoh
    • Thread
    • distortion distortion in both channels mc225 sound tube amp
    • Replies: 28
    • Forum: McIntosh Audio
  5. Alfmonster

    MC225 slight buzzing right channel

    I recently started playing the MC225 through some horn speakers and started picking up slight buzzing in the right channel. I switched RCA L/R plugs as well as the speaker wires to make sure and have found that it is definitely coming from the MC225 Right channel. another trouble shooting I...
  6. Alfmonster

    Garrard 401 restoration help

    Hi AK — I’m very exited as I’ve recently picked up a Garrard 401. I have restored a Thorens TD150 mk i but am realizing this is a whole other beast. I’m not sure why but I can’t seem to find a webpage or video that explains a how to restore a 401 — Can someone kindly point me to some help as...
    • Alfmonster
    • Thread
    • 401 garrard garrard 401 mc225 mcinstosh thorens
    • Replies: 1
    • Forum: Turntables
  7. Alfmonster

    Audio Research AR3 with Mac4100 / MC225

    Has anyone paired an Acoustic Research AR3 with a mac4100 or a MC225/MX110z combo? And if so, any thoughts regarding the pairing?
  8. Alfmonster

    Headphone amp for McIntosh MX110z

    I recently acquired an Audeze LCD-2 (pre fazor rev2) and wanted to find a headphone amp to use with my McIntosh MX110z. Has anyone had any successes in pairings that worked well? Been reading about Schiit Audio Magni Heresy and the Vali 2+ but wasn’t sure about how it would work with the...
    • Alfmonster
    • Thread
    • audeze audeze lcd-2 headphone amp mc225 mcintosh mcintosh mc225 mcintosh mx110z mx110z
    • Replies: 4
    • Forum: Headphones
  9. Alfmonster

    AmpRX Brownbox for vintage tube Amps

    Has anyone on here used the AmpRX Brownbox (https://www.amprx.net/product.html) with a vintage tube amplifier? It was originally made for voltage regulation for vintage guitar tube amps. Also, does anyone know for certain if these things output Sine Waveforms or does it output square...
    • Alfmonster
    • Thread
    • amprx brownbox brownbox mc225 mcintosh mcintosh mc225 mx110z tube amp voltage regulators
    • Replies: 4
    • Forum: Tube Audio
  10. Alfmonster

    MC225 transformer heat

    Other MC225 owners, how hot does the transformers on your mc225 get during 6 hours of use? Mine stays warm to the touch for about 3 hours - Anything beyond that it gets hot. At around 6 you can still touch the transformer for a little bit - but can’t leave your hand on it like you could at...
    • Alfmonster
    • Thread
    • mc225 mcintosh mcintosh mc225 mcintosh tube amplifier
    • Replies: 47
    • Forum: McIntosh Audio
  11. Alfmonster

    MCD7007 share between 2 systems

    Can the MCD7007 be shared between a MC225/mx110 (fixed out) and a Mac4100 (variable Output) by having one connected to the fixed output and the other to the variable output?
  12. Alfmonster

    Recommendation for MC225 external VU meters

    To prevent overloading the MC225, I was wondering if anyone had recommendations of external VU meters of some sort or other power output monitor. Any help would be greatly appreciated!
    • Alfmonster
    • Thread
    • mc225 mcintosh mcintosh mc225 tube amp tube amp help vu meter
    • Replies: 9
    • Forum: McIntosh Audio
  13. Alfmonster

    MC225 hookup to Russound AB2.2 help

    Has anyone hooked up a MC225 or similar with the 4/8/16ohm taps to a Russound AB2.2? I’m needing to power a 15ohm speaker and am not sure which tap to use when hooking up the MC225 to the Russound — Any help would be greatly appreciated!
    • Alfmonster
    • Thread
    • falcon ls3/5a mc225 mcintosh russound russound ab2.2 tube amp
    • Replies: 16
    • Forum: McIntosh Audio
  14. Alfmonster

    Amp/Speaker Selector switch recommendation to split use of speaker between Tube Amp/SS receiver

    Hi! Does anyone have a recommendation for an amp/speaker selector? I would like to safely split the use of my Falcon LS3/5a 15ohm between a MC225/MX110z and a MAC4100. I’m new to the selector world and so any help would be greatly appreciated!
    • Alfmonster
    • Thread
    • falcon ls3/5a mac4100 mc225 mcintosh mx110 tube selector solid state receiver speaker selector speaker selector switch tube amp
    • Replies: 13
    • Forum: McIntosh Audio
  15. A

    Help! New problems with C22, MC225 setup

    Hi all, I’m in the process of building a new system with an original C22 (rebuilt) and MC225 (also rebuilt). I have yet to get new speakers and turntable—currently running the amp and preamp with my old bowers and wilkins speakers and fluance turntable. Prior to today everything was working...
  16. Alfmonster

    McIntosh MX110Z and C20 (later model)

    Hi, I've been wanting to get a tube preamp for quite some time and am now able to go either way between an MX110Z or a c20. Both have been looked over and meets or exceeds original specs. Perhaps what is causing a pause from going with the mx110z is the cosmetics. The gold lettering is...
    • Alfmonster
    • Thread
    • c20 mc225 mcintosh mcintosh c20 mcintosh mc225 mcintosh mx110z mr78 mx110 mx110 tube tube preamp
    • Replies: 18
    • Forum: Tube Audio
  17. D

    What do you think about a CJ PV9A with a Mcintosh MC225

    Hi Everyone, I was wondering if anyone can help me determine if a Conrad Johnson PV9A preamp would be a good match for my Mcintosh MC225? I am new at all this and could use some help. I am worried about matching the components and don't have enough knowledge or experience to make the decision...
    • DenverJW
    • Thread
    • conrad johnson harbeth mc225 mcintosh pv9a tube preamp tube preamplifier zu audio
    • Replies: 8
    • Forum: McIntosh Audio
  18. D

    Tube Preamp please help me choose

    Hi Everyone, Still new here and learning, the help from this site has been amazing! I am trying to choose between 3 Preamplifiers and could use some help again. My power amp's are original Dynaco MK3 monoblocks unmodded and speakers are Wilson Audio Watt2 puppy 3's. I use a Pro-Ject Pre Box...
    • DenverJW
    • Thread
    • dynaco dynaco mk3 mc225 mcintosh preamp preamplifier tube wilson audio
    • Replies: 18
    • Forum: Tube Audio
  19. Alfmonster

    Rogers LS3/5a and Falcon LS3/5a

    Hello AK, I don’t have a ton of space for larger speakers so I’ve been looking into bookshelf speakers and have I’ve become very interested the LS3/5a speakers. The two versions that caught my interest were the original Rogers version and the newer Falcons. With my limited searching skills...
    • Alfmonster
    • Thread
    • bbc ls3/5a c27 falcon falcon ls3/5a ls3/5a mc225 mcintosh rogers rogers ls3/5a
    • Replies: 0
    • Forum: Speakers
  20. Alfmonster

    Mc225 to c27 stereo wiring help

    Hello AK! I’ve recently changed my speaker wiring setup to go from the mc225 amp to the c27 preamp so I could use the headphone output. I’m reaching out to the AK community to see if maybe someone has experience with biwiring to the speakers directly from the preamp — and perhaps would be kind...
    • Alfmonster
    • Thread
    • bi-wiring c27 mc225 mcintosh mcintosh c27 mcintosh mc225 preamp speaker wiring
    • Replies: 10
    • Forum: McIntosh Audio
  21. Alfmonster

    MC2100, MC225, MC240 advice needed

    I became obsessed with higher fidelity sound through Jazz - and I remember hearing for the first time the muted trumpet of Miles Davis on vinyl and being emotionally floored. It was on a really bad system, but that didn't matter - the music went beyond the sound quality and that was my gateway...
    • Alfmonster
    • Thread
    • 166mkii c26 c28 c29 mc2100 mc225 mc240 mcintosh monitor audio bronze 2 thorens
    • Replies: 41
    • Forum: McIntosh Audio
  22. moediggz

    Mc225 chasis lettering help!

    Hey guys. I got a gorgeous mc225. All original working but the lettering is toast. I can't find a source for a nice chasis to swap. Do any of you out there have vector files of the lettering or know someone who can help or have any good advice for me?
  23. OneyedK

    MC225 arrived, restoration project

    My MC225 has finally arrived, customs cleared me out so sourcing parts will go slow. Time to do some preparations... I did my homework, so hints and tricks for the MC225 are gathered in one document. Still value any remarks and suggestions from you all! A litte question to start, is there any...
  24. OneyedK

    MC225 choke/PS question

    I ordered an MC225 from a seller on the evil bay. Shipment will take it's time (estimated beginning december), so that leaves me preparing for the worst... Reading all there is to read on this amp, including several fine topics on this forum, I couldn't find much on the optimal values of the PS...
  25. N

    Distortion in one channel Mcintosh 225 amplifier

    I've had a Mcintosh 225 tube amplifier for about 5 years and the other day it developed distortion in one channel when the volume was turned up fairly loud. Here's what I've done: 1) Verified bias is at -21 volts for all 4 output tubes 2) Replaced all tubes with known good ones one-at-a-time 3)...
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