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7189

  1. A

    Power Tube Guru Needed

    Power Tube Guru Needed Assume we have a Hi-Fi stereo amplifier designed for, say, the 7189 power tube. That tube has a plate voltage rating of 400V. Assume the schematic for the amplifier shows 420V going to the 7189 power tube. That seems a good and reasonable variance and all is well...
  2. Carbsandcaps

    Biasing a bogen srb-40

    Working on a bogen stereo receiver and I’m trying to set the output bias. It has a weird current monitor setup where normally the cathode goes straight to ground but then you open these connectors and that puts a 15ohm resistor into the circuit. I’m assuming you then set the bias through the...
  3. 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
  4. artsybob

    Replacing Speaker Screw Terminals + Phono Input Interference

    I've really been enjoying my Realistic SAF-40D tube integrated amp over the past four years, however the worst part of the amp's design, and that of most other amps of the 1960's, is that I hate the tiny speaker screw terminals on the back. It makes plugging the speaker cables in a huge chore...
    • artsybob
    • Thread
    • 7189 integrated amplfier realistic saf-40d tube
    • Replies: 5
    • Forum: Tube Audio
  5. CoolOhm

    7189 Monoblock Project

    Hello: I am posting this in the hopes someone can shed some light on some nice old iron I just acquired. I have two nice PTs and two nice ultralinear OPTs, all pulled from two mono 6BQ5 ∕ 7189 amps. These were taken from organs from the early sixties. The amps have 6GH8s and EL84s in...
    • CoolOhm
    • Thread
    • 6hg8 7189 7199 electrohome monoblock s-5000 sherwood
    • Replies: 24
    • Forum: Tube Audio
  6. artsybob

    Realistic SAF-40D Right Channel Problem

    My Realistic SAF-40D tube integrated amp was working flawlessly for the three years since I had it recapped. However, my right channel speaker cut out a few weeks ago. No sound will come out of it though both channels come in clearly through my headphones. I thought it might have been the...
    • artsybob
    • Thread
    • 7189 amplifier integrated amp japanese tube amplifier radio shack realistic saf-40d tube
    • Replies: 2
    • Forum: Tube Audio
  7. D

    Valve Matching For Fisher X-100 A

    There is a missing 7189 valve as part of the output stage for the Fisher. I'm looking to order one online (tung-sol from Russia) where they say you can order a matched pair. Is it important to get a matched pair? Thanks Dan
    • DG Nelson
    • Thread
    • 7189 fisher x-100 a
    • Replies: 3
    • Forum: Fisher
  8. artsybob

    Realistic SAF-40D Integrated Amp Score

    I just scored a Realistic SAF-40D integrated tube amp for a pretty good price (by eBay standards). It's a Japanese-built unit (possibly made by Kenwood or Pioneer) utilizing four 7189's, four 12AX7's and a 5AR4 rectifier. From the auction description it powers on but desperately needs a...
    • artsybob
    • Thread
    • 1966 1967 7189 integrated amp radio shack realistic saf-40d tube
    • Replies: 34
    • Forum: Tube Audio
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