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6550

  1. sae-7125

    yet another 6550 bias thread, as it relates to cj design consternation

    after reviewing more than a few threads across the usual assortment of forums, and some one-on-one with a calculator, there are a few things that seem slightly disaster prone for the cj mv75a-1 (mv75/mv75a/mv75a-1 evolution family tree). i will refrain from boring readers with the parts cooker...
    • sae-7125
    • Thread
    • 6550 cathode resistor cj snowflake engineering conrad johnson excessive bias setting high anode voltage mv75a-1 some like it hot tube bias
    • Replies: 38
    • Forum: Tube Audio
  2. pixelriffic

    6550/KT120 Settings for Hickok TV-7

    Howdy y'all. I have done many a search for this, but anything I find seems to just point to a doc that is no longer available. Some suggest just testing these as a 6L6? While the settings work, the minimum reading can't be the same? Any direction appreciated.
  3. James Cox

    Scott LK-150 restoration thread

    Hey everyone! Ive finally decided to do a full restoration thread from start to finish after scoring a good deal on a Scott LK-150. I've ordered the parts and have most of them on hand but still waiting for some stuff from Jim Mcshane. The amp came without any tubes but I've got some lined up...
    • James Cox
    • Thread
    • 6550 diy lk-150 power amp restoration scott tube
    • Replies: 76
    • Forum: Tube Audio
  4. James Cox

    Kt-120 compatibility with Scott LK-150 tube amp

    Hey everyone, I'm in the process of picking up a Scott LK-150 but unfortunately it has no tubes. I was wondering if anyone here has tried KT120 tubes on this amp or of they draw too much current to be safely used here. When it gets here this piece is going to need a decent amount of work before...
    • James Cox
    • Thread
    • 6550 citation ii kt120 kt88 lk-150 power amp scott tube amp
    • Replies: 16
    • Forum: Tube Audio
  5. kcline

    Sorting Audio Tubes out of a large Radio tube collection

    My partner in all things radio received from the estate of the late Les Goldberg his garage collection of radio tubes, he also got his Hickok 539-C tube tester. Les was a regular at Kutztown every time it was held, he died the Monday after the last Kutztown meet which he did attend but only for...
    • kcline
    • Thread
    • 6550 7189 7591 el-37 tubes
    • Replies: 9
    • Forum: Tube Audio
  6. AlexHempel

    RCA MI-112182 Monoblock Tube Amps

    Been wanting a pair of RCA PA/theater monoblocks for a while, but never pulled the trigger -- until now. Bought a pair of these for probably more than they're worth. The seller states they're from the collection of an ex-RCA engineer, which I'd normally be skeptical of, but could be true given...
  7. kcline

    Testing used up looking Tung-Sol 6550 Type one

    See pictures; This was in my Dynaco Mk-3 Paoli mod amps. I was testing today using my Maxi-Matcher. This tube had been in amp for 4 years, I would guess around 1000 hrs and this was used already. A few weeks ago I retubed with GE 6550 and today I decided to retest the worst looking of the four...
  8. david winter

    Luxman MB3045 6550 mod different from usual ones

    Hi, I'm trying to bring a pair of MB3045 back to life. They are both equiped with Sovtek 6550 wich I will replace by NOS Sylvania. I found a few mods inside, and they seem to differ from what I read: - Around the 3x47µF/450V capacitor, I see 12K-68K-150K instead of 12K-100R-150K in the original...
  9. B

    Quicksilver Monoblock, B&W Diamond speaker, Tube Blow

    I have a set of monoblocks (takes EL34, 8417, or 6550 tubes) which I want to hook up to the Bowers & Wilkins 805D speakers. When my output tube failed in the past, my L100 speakers produced a very loud pop sound that I fear might damage the $1k diamond tweeters aboard the B&W speakers. Of...
    • briguy986
    • Thread
    • 6550 805 b&w bowers wilkins el34 jbl kt88 l100 quicksilver tube amp
    • Replies: 5
    • Forum: Tube Audio
  10. G

    1971 Plush 4000G w/4 12s

    Hello all, I have a 1971 Plush 4000G with a 4-12 Plush cabinet. It has spent a lot of it's life in storage and is still working great. I'm thinking about trying some newer speakers in it. I read some old threads here and there were quite a few experts on the subject but they've gone missing...
    • Griego
    • Thread
    • 1971 4000g 6550 alnico guitar amplifiers plush vintage
    • Replies: 0
    • Forum: Tube Audio
  11. kcline

    Tung-Sol 6550 Type Three now installed in "Harry Gates" Amp

    I have now around 200 HRS on the "Harry Gates Memorial" amp. Have been running a set of Sovtek 6550,s, today changed to Tung-Sol type 3 6550. These are all marked Raytheon Adjusting bias to each tube to 50mA. Hope to listen to this tonight after work. If I cannot tell any difference I will put...
  12. H

    McIntosh 40 MC40 Can I use KT88 or 6550?

    McIntosh 40 MC40 Can I use KT88 or 6550? Does anyone know the current capability of the filament winding of the power transformer? Thanks
    • Hi-FiGuy
    • Thread
    • 6550 kt88 mc40 mcintosh power transformer power tubes
    • Replies: 21
    • Forum: McIntosh Audio
  13. thorpej

    Low-noise power supply without a choke

    Diversions from day-job work desperately needed, so... been playing with the power supply for the 6550 amp I'm contemplating. I'm concerned with using a choke in the power supply because of the inductance drop at full power. Even the 3H Hammond 193N is only rated at 500mA. I used this choke...
  14. thorpej

    Location of screen taps on Triode A431S output transformers?

    House is still a construction zone, meaning my garage is not usable yet, and it's driving me nuts. But if I can't build, at least I can put thought experiments to paper, so another amp is on the drawing board. I'm planning a 6550-based ultra-linear amplifier, and I'm considering using the...
    • thorpej
    • Thread
    • 6550 a431 dynaco ultra linear
    • Replies: 2
    • Forum: Tube Audio
  15. CZ4A

    T-S 6550 biasing in Yaqin MC-100B

    I have a quad of strong, vintage Tung-Sol 6550s (marked RCA) that I want to use in my bone-stock Yaqin MC-100B. I've seen posts here and elsewhere saying the T-S 6550s have been used in this amp before, but no mention of bias voltage. The factory-recommended bias voltage is 0.55V (even says so...
    • CZ4A
    • Thread
    • 6550 mc-100b tung-sol yaqin
    • Replies: 1
    • Forum: Tube Audio
  16. ScooterMcTav

    EL-34/KT-77/6550/KT-88 Recommendations

    Hello all, I recently came into a Jolida JD302BRC which I have enjoyed immensely. It came with three quads of output tubes: sets of Tung-Sol 6550, Elecro-Harmonix EL-34, and JJ EL-34. So far I have tried the Tung Sol and the JJ. The JJ were inoffensive but undistinguished, while the Tung...
  17. ScooterMcTav

    Audio Frequencies Causing Tinnitus

    Afternoon all, Since I am surrounded by experienced audio lovers, I had a question I hoped you could help me with. As someone who's listened avidly to music for 40+ years, and who has gotten more serious about gear over the last few years, my question is if anyone else experiences tinnitus...
  18. vaathi

    How to test Ei KT90 tubes

    Hello friends... I came upon a pile of used KT90 and used Svetlana 6550C ( I don't know how to figure out if it is winged or not. 16 of KT90s dont have any marking and other 16 have Ei VTL in blue lettering. Guy who sold me said the amp he was using used these some 20 + years back and he...
    • vaathi
    • Thread
    • 6550 conar kt88 kt90 tube tester help
    • Replies: 4
    • Forum: Tube Audio
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