Recent content by mordy
  1. mordy

    Little Dot Tube Amps: Vacuum Tube Rolling Guide

    Thanks - I did not know that there are two versions; only have the tall one. BTW, I have made an observation over the years that larger tubes often sound better. I am sure that there are exceptions, but somehow it appears to me that the larger/taller tubes are better sounding in general.
  2. mordy

    2359glenn | studio

    Free shipping?
  3. mordy

    2359glenn | studio

    Well, I have noticed it and yesterday my finger reminded me of it lol! I am burning in a tube and it was much hotter than I thought - 77C. After a few more hours of use and cooling off overnight it now measures 64C under the same conditions.
  4. mordy

    2359glenn | studio

    Speaking about tubes, it appears to me that new tubes generally run hotter in the beginning of using them, compared to when they are burned in. Did anybody notice this? Is there an explanation for it?
  5. mordy

    Oblivion | UltraSonic Studios

    The implementation I have to leave for the amp designers - not familiar with those things. I am kind of allergic to more adapters though. The GU-50 has eight pins but no guide pin (there is a ridge on the glass for orientation) and it is possible to insert it the wrong way. There is actually a...
  6. mordy

    Oblivion | UltraSonic Studios

    In the KT88 family, Jacmusic votes for the Russian GU-50/ГУ-50. This tube has its own pinout , uses 12V and draws 0.8A. And it is very inexpensive - you can find them for less than $5 each + shipping. BTW, the GU-50 was based on (or cloned from?) another Telefunken tube - the LS50. The GU50 has...
  7. mordy

    Tube rolling thread | UltraSonic Studios

    I have tried a bunch of different 6U7G (US and Australian made) in the Glenn OTL with an EL32 adapter. Can be found very inexpensive. I have persistent problems with hum to the point that most of them are unlistenable, but overlooking the hum the sound is very nice with great mid bass. When you...
  8. mordy

    Oblivion | UltraSonic Studios

    deleted
  9. mordy

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    All this information is in the Radiomuseum and it is very easy to access. Just go to Google, type in Radiomuseum 6J5G and all the information is there. https://www.radiomuseum.org/tubes/tube_6j5g.html On the left, a couple of lines down, it says First Source and gives the year the tube was...
  10. mordy

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    The 6J5G (ST Coke bottle shape) tubes appeared first in 1936. The 6J5GT (straight glass) appeared first in 1938.
  11. mordy

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    Good company! As somebody who brought attention to the ladder plate Fotons (6H8C) , I was under the impression that they were made between 1952 and 1955. Is the1958 the same construction?
  12. mordy

    Little Dot Tube Amps: Vacuum Tube Rolling Guide

    Agree. But if you have patience they sometimes came up for much less. I used them a lot when we experimented with oddball tubes in the LD MKIII in the old days.
  13. mordy

    Little Dot Tube Amps: Vacuum Tube Rolling Guide

    You can still find them, but some prices are crazy. The one to look for is this one - $49 at this site: (TUA) TVS-7 Pomona 7 pin miniature tube socket saver test adapter. Eyelets for hook clip leads for each pin. https://www.surplussales.com/Tube-Sockets/TubeSkts-1.html There are some offers on...
  14. mordy

    The Reference 6J5 Thread (L63, 6C5, 12J5, 6P5, etc.)

    Every setup and preference is different. Personally, I prefer the Sylvania 6J5GT from the very early 50's. These are metal base tall tubes and I imagine that they sound better than the metal base Sylvania 6SN7W (only have black base Sylvania 6SN7W) - at a fraction of the price.
  15. mordy

    Oblivion | UltraSonic Studios

    I think Special Quality means 10,000 hour life, but I have not been able to find an answer if the sound quality is better in long life tubes. Mullard made Millennium 10,000 hour tubes, and Russian tubes with the DR suffix are also supposed to last 10,000 hours. Most tubes are rated 3000 - 5000...
Top