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mc275

  1. VintTannoy

    The GEC KT88

    I have documented all the versions and iterations of the GEC KT88 tubes in this video. Please let me know if you have any questions.
  2. M

    Bi-amp Klipsch w/MC275 and MC152 at different Ohms

    Hello experts. I am currently bi-amping my Klipsch Heresey iv speakers with a C55, MC275 for the highs and mids, and a MC152 for the woofers. I have the C55 set to bi-amp in split mode with crossover frequencies set at 3000hz low pass and “bypass” for high pass. Currently the speakers are...
    • M33SEC
    • Thread
    • bi-amp bi-amping c55 klipsch heresey mc152 mc275 mc275 vi ohm ohms
    • Replies: 8
    • Forum: McIntosh Audio
  3. Megaladoink

    Mc275 CE Chassis screw

    So I realized that when removing the cage, it’s gouged the transformers a bit. So., I unscrewed the post screw thingys and one came off nice and easy. The other one is completely unscrewed but seems to be secured by a nut under the chassis itself. Does that mean the screw I successfully removed...
  4. pgena

    Demise of MC275 filter caps

    My vintage MC275 suddenly developed a 120Hz Hum (ca. B-flat, an octave below middle C). I replaced the filter caps with the same brand that I had installed 10.5 years ago (C-EC100-100-500 from Antique Electronic Supply). After removing the old ones, I verified that the A sections on all four...
  5. mozcho

    MC275 - Fake?

    There is a guy wants to sell this, says China made. Does it look authentic?
  6. N

    MC 275

    Can anyone tell me when my MC275 was manufactured? Serial number ABP1196 Any help would be appreciated.
  7. Molnar142

    McIntosh MC275 Mrk VI ... Tube Temperature Question - Problem?

    Looking for some help regarding a McIntosh MC275 MkVI The other night I was listening at a relatively high volume level (no distortion...~95dB) After about 3-4 minutes there was a very brief crack/distorted sound and the amp shut off. Three front tubes on the right were blinking red. I gave...
  8. HighFi.ED

    Help with a McIntosh MC275 Mk V Amplifier

    I’m thinking of getting a McIntosh MC275 Mk V Amplifier and would be pairing it with a McIntosh MP100 Preamplifier and will be using Martin Logan Motion 60XT Floorstanding Speakers. Only thing holding me back is that I need something to be able to adjust the Volume, Bass and Treble. Any...
  9. Walter R

    My Macs...

    I’m a 67 yo retired engineer living in Chicago. My music interests range from symphonic classical music to classic rock. My living room system consists of two MC275’s, each operating in bridged mode for 150w per channel. One’s a MkIV, the other is a MkV. They’re driving a pair of Thiel...
  10. s_alvanip

    New MC275 Red Plating Out of the Box

    Hi all, New member here and new owner of my first piece of Mac kit: an MC275 MKVI. I just unboxed the unit, took the tube cage off, and connected the power to my power conditioner (Panamax M5300-PM) to see those tubes light up. Much to my dismay the front 7 tubes lit up amber, then green, then...
    • s_alvanip
    • Thread
    • mac mc275 mcintosh mkvi power guard sentry monitor
    • Replies: 29
    • Forum: McIntosh Audio
  11. M

    MC275/KT88

    I just upgraded the tubes in my MC275 MKVI from the standard McIntosh tubes to Shuguang Treasure KT88-Z black bottle tubes. I notice that the Shuguang tubes run a lot hotter than the McIntosh tubes. Have other people noticed the same?
  12. Lockheed Mar

    MC275 Mk. VI with Raytheon 6414 tubes?

    The 12AT7 tubes on my MC275 Mk. VI are old and need to replace. Could I use these Raytheon 6414 tubes on 12AT7 spot. Thank you.
  13. Elemental

    Biasing Question on Mx110 Preamp Section

    Technical question: I'm troubleshooting distortion on a McIntosh Mx110Z and wanted to rule out incorrect biasing of the 12AX7 tube (V15) which is the first stage of the preamplifier section. Looking over the schematic, something doesn't make sense. The schematic says that on, say, the right...
  14. Lockheed Mar

    Monoblock MC275 50th Anniversary tube rolling help (12AX7 on V3, V5 position)

    Hi everybody I have a question about tube replacement for my MC275 (50th Anniversary version). My MC275 is running in monoblocks, so do I need to replace two 12AX7 on V3 and V5 position or just one of them? Which tubes (NOS) I should buy? I have Mullard CV4004 on C2300, Shuguang KT-88Z on...
  15. Brice

    KT120 to a vintage MC275? Anyone?

    Hi guys, Has anyone tried the KT120 tube on a vintage MC275 instead of the KT88? I know the heater current is a bit higher but I believe the PT can take that. I am more concern at the biasing level. Any thoughts? Thanks Brice.
  16. Brice

    MC275 rebuild

    Hi guys, It has been a long time since I got a new McIntosh and working on it. My Christmas present came early this year and I now have a nice vintage MC275. It's not the prettiest in the bloc but it works fine for its age. Despite a rough shipping with broken tubes, it's now here for some...
  17. J

    MC275 - KT88 output tube not glowing

    Dear McIntosh experts. I have had used my MC275 MKV for 1½ years and love it. Some time ago the fuse blew. I replaced it and the amplifier was working and sounding fine afterwards. But I noticed, that one of the (original) KT88 tubes (V11) was not having a purple glow in the surface of it...
  18. Karl Jeffs

    MC275 or MC75 monos with PSB Synchrony Ones?

    Hello All, I'm new to posting here but have perused the threads as an observer for quite some time. I'm trying to make a decision which is slowly driving me nuts. I bought a used pair of PSB Synchrony One's without realising my 35Wx2 PrimaLuna Prologue Classic wouldn't be able to drive them...
  19. Karl Jeffs

    Tube amp for PSB Synchrony One speakers?

    Hello All, I'm new to posting here but have perused the threads as an observer for quite some time. I'm trying to make a decision which is slowly driving me nuts. I bought a used pair of PSB Synchrony One's without realising my 35Wx2 PrimaLuna Prologue Classic wouldn't be able to drive them...
  20. Stereofro

    C2200 Humming.....Tubes?

    I noticed while investigating issues I was having with my 275 that I have a low hum coming from my C2200 pre. The hum is there when the unit is in standby. When the tubes warm up and the unit comes out of start up the hum seems to ubruptly stop. I have tried my power conditioner, a different...
  21. bi-amp

    bi-amp

    Can I bi-amp with this setup?
    • estim8d
    • Media item
    • 805s b&w bi-amp mc2125 mc275
    • Comments: 0
    • Category: The Big Bucket
  22. My System

    My System

    1962 MC275 w/EH KT88's C-29 Rotel 1072 CDP Bozak B-302a's
    • VA tubeaudio
    • Media item
    • mc275
    • Comments: 0
    • Category: Member's Systems
  23. Steve's MC275

    Steve's MC275

    1962 MC275. Completely Rebuilt. EH KT88 tube complement.
    • VA tubeaudio
    • Media item
    • mc275
    • Comments: 0
    • Category: Member's Tube Gear
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