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Recent content by spantou01

  1. spantou01

    Tung Sol KT 120 4 number code on the collar/base??

    I have two unopened quads of these and opened one box to look for the codes. Mine has 11 01. Google says: “ The KT120 power vacuum tube was first announced and made available for sale in March and May of 2010 by New Sensor under the Tung-Sol brand.” My conclusion is also year first, followed...
  2. spantou01

    JEL 2a3 Deluxe schematic clarification?

    There are several versions of JE Labs 2A3 SE schematics out there, including SRPP versions (implemented by Skunkie Designs in this manner), and lots of good as well as nonsense discussions being generated these days. Please provide links to specifics. I don’t recall any non-SRPP version using a...
  3. spantou01

    Heathkit W6 testing and issues

    You are right - different league. The real question is how does the W7 do in its own league, vs Dynaco Mk2.
  4. spantou01

    heathkit w-5m renovations [boondoggle edition] quantum vacuum deep dive

    Thanks for sharing all this information! Does this mean each transformer has two caps? So, there is a capacitor between anode no.1 wire and screen grid tap 1 and another capacitor between anode 2 and screen grid 2? I don’t see the second capacitor. Perhaps I misunderstood what you wrote. Could...
  5. spantou01

    Arc ref 75 w/ kt150s

    Hey @CORALX8, Have you been able to sort out the possible overheating/mis biased tubes? Also curious to hear what ARC says about using KT150 tubes in you non-SE Ref. 75.
  6. spantou01

    heathkit w-5m renovations [boondoggle edition] quantum vacuum deep dive

    I counted 6 layers of the nickle lams. Are these laminations nickle-iron alloys and if so what? I assume they are not pure nickle. I also wondered why they are arranged in a single group/stripe in the middle of the laminations rather than dispersed. The purpose of the nickle-iron lams I think...
  7. spantou01

    ALPS Blue Velvet vs TKD 2CP-2511 for an Elekit TU-8500

    Google is your friend. Apparently TDK 2CP-2511 is smooth i.e. without indents. TDK 2CP-2511S has the indent feel, but is NOT a switching type, while TKD 2P-2511S is and has real steps. I assume that means it is a real ladder attenuator. Look here: TKD Tokyo Ko-On Denpa volume control main...
  8. spantou01

    heathkit w-5m renovations [boondoggle edition] quantum vacuum deep dive

    Yes, please let us know how the capacitor is connected and what value it measures in your specimen. Wonder how we can find out what the value is supposed to be.
  9. spantou01

    heathkit w-5m renovations [boondoggle edition] quantum vacuum deep dive

    Your 16309 appears to have fewer nickel laminations than the one in the thread you linked to. Or is it the camera angle?
  10. spantou01

    Futterman OTL 3 w/ upgrades

    Thanks for your posts and interesting history. IIRC I had a Dynaco ST70 driver board that George Kay designed long ago.
  11. spantou01

    Arc ref 75 w/ kt150s

    Fair enough! @CORALX8 please do so and let us know what the gurus say, and why.
  12. spantou01

    Arc ref 75 w/ kt150s

    I am eager to hear what changes the ARC SE version actually made over the “standard Ref. 75, to accommodate the KT150 tubes. I bet that does not include a power transformer or output transformer swap. Not needed, because surely the ARC designers would allow for the worst case scenario of 4 KT120...
  13. spantou01

    Arc ref 75 w/ kt150s

    I’m not sure what you mean by this. Are the plate glowing red? I.e. red-plating? Of all the tubes: power and small signal tubes? Are you familiar with how hot tubes typically get? My guess is that the glow you observe is from normal heater operation. Red-plating would be a big concern. I would...
  14. spantou01

    Tubes for hifi Dynaco ST70 board makeup.

    +1. Dave Gillespie recommends the use of/conversion to SS diodes after a thorough testing of the stock Dynaco ST70. See top of page 5 in the attached article. https://www.audioregenesis.com/documents/dynaco-st-70-base-line-testing.pdf
  15. spantou01

    Tubes for hifi Dynaco ST70 board makeup.

    Oh, you posted file pics, not your board. Could you post photos of what you have? Is there a version number printed?
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