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Old 4th December 2011, 05:19 PM   #11
Gary Osoba is offline Gary Osoba
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I have a Yamaha B-1 that has been in storage since 1980- recently had it checked and the unobtainable SK77's are fine. There are problems with auxilliary circuits and I'm technically challenged in this field. If someone wants to purchase it and have a go at it or a new implementation please contact me at

wosoba@cox.net

Thanks,
Gary

Gary
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Old 4th December 2011, 05:21 PM   #12
Gary Osoba is offline Gary Osoba
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Sorry, that's 2SK77's.

Best Regards,

Gary
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Old 4th December 2011, 05:23 PM   #13
tunerman is offline tunerman
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audiodiyers.hu • Téma megtekintése - V-FET single ended amplifier
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Old 9th December 2011, 11:22 PM   #14
dznr02 is offline dznr02
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Default L’Amp: A Simple SIT Amp: Part 1

If you check into the Journal of Audio Engineering Society vol. 8 for 1960 you can read about a "Signal Biasing Amplifier" designed by Richar Heyser and patented by Cal Tech. His amplifier was about the same power as the SIT amp and without output transformer also. Dick gave a talk at TRW Laboratory that year using his amplifier built into a package about the size of a cigarette pack that was held in his shirt pocket. The amplfier was used as his P.A. amplifier. Later in the talk he also showed that a closed circuit video could be played through the same amplifier since the bandwidth was better than 4 mHz. I spoke at the same meeting describing an early germanium transistor amplifier that was sold under the name of TEC (Transis-Tronics). The same design was sold also with slight styling changes by Olson Electronics, The Knight Div. of Allied Radio, Lafayette Radio, and Radio Shack. Those were the "Good Ol' Days" when everything was new. Russ Allee
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Old 23rd December 2011, 11:40 AM   #15
Skorpio is offline Skorpio  Denmark
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Very nice article!

When will part two arrive? I may contain a CCS instead of the light bulps?
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Old 23rd December 2011, 01:36 PM   #16
Michael Rothacher is offline Michael Rothacher  United States
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Part Deux shouldn't be far off.

But, it's not what you think it is.
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Old 27th February 2012, 02:46 PM   #17
Einric is offline Einric  United States
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Default C2

That output capacitor C2..... is that a standard polarized cap?
Why not a NP?
I love this simple idea!
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Old 27th February 2012, 06:05 PM   #18
Michael Rothacher is offline Michael Rothacher  United States
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Yes, that's a standard polarized electrolytic capacitor.
The output is at +20V or so, so you need to observe the correct polarity.
You could use a NP cap (if you can find one that big). You could also bypass the output cap with your favorite fancy film cap.
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Old 27th February 2012, 07:27 PM   #19
Einric is offline Einric  United States
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So this cap would be serving as an output coupling capacitor?
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Old 27th February 2012, 07:34 PM   #20
Zen Mod is offline Zen Mod  Serbia
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Location: ancient Batsch , behind Iron Curtain
certainly
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