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dwhitf 14th November 2010 07:49 PM

If you were going to build a OTL?
 
If you were going to build a OTL (output-transformerless) amplifier and you knew you had to live with it long term which one would it be.

dwhitf 14th November 2010 08:42 PM

I made a mistake see other thread with voting, sorry for the Dup. thanks dwhitf

Miles Prower 14th November 2010 09:47 PM

Quote:

Originally Posted by dwhitf (Post 2365172)
If you were going to build a OTL (output-transformerless) amplifier and you knew you had to live with it long term which one would it be.

MOSFET Circlotron final, hollow state front end. The A Number One problem with any hollow state OTL is operating the finals into nearly vertical loadlines. That makes for big time distortion, and it becomes questionable whether that is preferable to just going ahead and using source followers. Just make sure that your source followers stay away from the rails since MOSFET internal capacitances go squirrelly when Vds drops to low voltages.

Besides, a MOSFET Circlotron doesn't need a high current heater transformer, nor does it require knocking a dozen holes in the chassis. There is also the safety question: the MOSFET design won't put bigvolts on the speaker terminals if something poofs.

kevinkr 14th November 2010 10:14 PM

Quote:

Originally Posted by dwhitf (Post 2365172)
If you were going to build a OTL (output-transformerless) amplifier and you knew you had to live with it long term which one would it be.

I'd likely base it on one of Ralph Karsten's Atmosphere OTL amp designs, but more than likely I'd reconsider and probably go for a more conventional PP with an output transformer.

markusA 15th November 2010 04:41 AM

A M-60 seems like a likely candidate to me.

Luke 15th November 2010 05:46 AM

Quote:

Originally Posted by Miles Prower (Post 2365274)
MOSFET Circlotron final, hollow state front end.

Hi Miles, do you have a link to this amp?

Miles Prower 15th November 2010 08:29 AM

^^

Sure don't. It's a future project for someday. I haven't begun the design work for it.

Luke 15th November 2010 08:36 AM

Ah, it sounded interesting so I started googling and came up empty:)

Brit01 15th November 2010 08:39 AM

I'm working on a OTL, circlotron final, FET source followers, LTP split, and experimenting with different front drivers right now and biasing techniques and protection.

CLS 15th November 2010 08:44 AM

MOSFET Circlotron can be found at passdiy ;)


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