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Old 14th November 2011, 08:48 AM  
Michael Rothacher is offline Michael Rothacher  United States
www.audiohobby.com
diyAudio Member
 
Join Date: May 2001
Blog Entries: 4
Default L’Amp: A Simple SIT Amp: Part 1

Introduction & Plausible Deniability


I’m not a real amplifier designer, and this is not a real article about a wicked-good sounding, super-simple amplifier anyone can build using light bulbs and alien technology. Now that the pressure’s off, we can have a little fun.
...

Last edited by Michael Rothacher; 17th October 2013 at 11:55 AM.
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4th December 2011
Gary Osoba
diyAudio Member
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
4th December 2011
Gary Osoba
diyAudio Member
Sorry, that's 2SK77's.

Best Regards,

Gary
9th December 2011
dznr02
diyAudio Member
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
23rd December 2011
Skorpio
diyAudio Member
Very nice article!

When will part two arrive? I may contain a CCS instead of the light bulps?
23rd December 2011
Michael Rothacher
www.audiohobby.com
diyAudio Member
Part Deux shouldn't be far off.

But, it's not what you think it is.
I'm not hanging around the forum these days but if you need help: Visit My Website | My YouTube Channel | Email Me | Wheaton's Law |
27th February 2012
Einric's Avatar
Einric
diyAudio Member
That output capacitor C2..... is that a standard polarized cap?
Why not a NP?
I love this simple idea!
27th February 2012
Michael Rothacher
www.audiohobby.com
diyAudio Member
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.
I'm not hanging around the forum these days but if you need help: Visit My Website | My YouTube Channel | Email Me | Wheaton's Law |
27th February 2012
Einric's Avatar
Einric
diyAudio Member
So this cap would be serving as an output coupling capacitor?
27th February 2012
Zen Mod's Avatar
Zen Mod
diyAudio Member
certainly

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