Recent content by Lockheed Mar

  1. Lockheed Mar

    What McIntosh Gear Are You Using?

    McIntosh and JBL K2 speaker.
  2. Lockheed Mar

    Mixed 12AT7 tubes for MC275 MK VI?

    That's a great! Thank you very much :beerchug:
  3. Lockheed Mar

    Mixed 12AT7 tubes for MC275 MK VI?

    Thank you, Seamaster, so where is the best position to put the 12AT7 Brimar? Thanks.
  4. Lockheed Mar

    Mixed 12AT7 tubes for MC275 MK VI?

    Hi everyone, Des the MC275 can run normal with mixed 12AT7 tubes? I've two MC275 MK VI and recently change 4 pairs of 12AT7 (2 pairs per amp). The problem is I have 3 pairs CV4024 Mullard and 1 pair 12AT7 Brimar. Thank you very much for helping :)
  5. Lockheed Mar

    MC275 Mk. VI with Raytheon 6414 tubes?

    Thank you, I would roll some Mullard CV4024 for my MC275.
  6. Lockheed Mar

    MC275 Mk. VI with Raytheon 6414 tubes?

    Thank you very much, Ron. I should sell them and buy some 12AT7. Could you advise me some good NOS 12AT7, my power tubes are KT88-Z. Thanks.
  7. 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.
  8. Lockheed Mar

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

    I'm using JBL K2 S9900. Those spakers are big but easy to drive. The racks are build from Pyinkado wood. Thanks
  9. Lockheed Mar

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

    Thank you Sanmaster, It's very helpful :banana:. Heare is some photos of those bad boys for 4-2-7 https://goo.gl/photos/opg2cycYAnCuswqp8 :)
  10. Lockheed Mar

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

    Thank you for your feedback :-) Yes, it's very difficult to find 8 NOS KT88 power tubes. So I would like to replace these 12AX7. Do I need to replace two of 12AX7 on the V3L and V5R or one of them? Because I think MC275 monoblocks just use one of those tubes. Ps: I have replaced those power...
  11. Lockheed Mar

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

    The problem is not their amps, but the tubes on its. To me, these currently production tubes are not good as some NOS tubes. This is the reason I want to replace them :-)
  12. Lockheed Mar

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

    It's still working, but I want to make some improvements to my MC275. Thanks
  13. 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...
  14. Lockheed Mar

    MC275 MKVI tube identification

    Thank you for the information about these tubes :thmbsp: . I mean it (V5R 12AX7A) does not glow or heat, but the amp can still play music normally. The next day, I found it have some cracks on tube glass and the silver coat above the getter has gone white completely. I call my dealer, and...
  15. Lockheed Mar

    MC275 MKVI tube identification

    I think the V4L/R 12AX7A. Last month, my little V5R 12AX7A has broken broken down, but the MC275LE can still play music. Does anyone know why? (I'm running monoblocks) Thank you.
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