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Old 20th December 2009, 02:49 AM   #11
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Hi All
I have no knowledge in UHF, that I can not join the discussion with you guys. but I don't think the interstage transformer will pass the UHF signal. to me ,data from handbook can only tell me how the tube works but not how it sound, I always judge by listening and compare, distortion rate to me mean nothing, for example 60HZ sound with 0 distortion still a noise of hum. no one will say which hum sound better
regard Tony KY Ma
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Old 20th December 2009, 10:29 AM   #12
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The curves look no less linear than many other pentodes out there. Positive grid bias is interesting, but I wonder how much grid current it would draw.

Shoog
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Old 20th December 2009, 01:24 PM   #13
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Hi Shoog
for 5876 is negative bias, I use a ni-cad instead a resistor, save a by pass cap. 809 is in positive bias, about 12 ma, I use a LM 317 for voltage supply, just make sure the two currents (at the interstage transformer's pri and sec.) is in opposite direction, magnetism will cancel each other, I like triode better than others I only judge by listen and compare,curves, as long as it can work
regard Tony KY Ma
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Old 26th December 2009, 07:23 PM   #14
wa2ise is offline wa2ise  United States
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Quote:
Originally Posted by dhaen View Post
Which is why valves last for ever
Well, tubes do last forever sitting unused on the shelf or in equipment that sat unused.
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Old 26th December 2009, 10:37 PM   #15
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Quote:
Originally Posted by wa2ise View Post
Well, tubes do last forever sitting unused on the shelf or in equipment that sat unused.
Mr. Koichi Shisido who passed away in 1997, people call him father of single end. He dug out a lot transmission tubes like 800 808 826 838 830 805 etc. converted them to be use in SE amp for audio. He wrote a book about the conversion, He did compared those tubes working in negative bias (high voltage over 1KV and less current only 30ma), sound not OK, but changed to a positive bias, every thing changed (low voltage 250-800v high current over 100ma) sound wonderful. WAVAC is making some of them in the market Happy New Year Tony KY Ma
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