Hybrid Aikido-ish gain stage

Fuling · 1st September 2006, 08:47 AM

How about this circuit for driving a Mosfet power follower?
ECC86 is the european version of 6GM8, before anyone misreads and asks why I´m using ECC88 (6DJ8) at such low plate voltage.

A short explanation of the schematic:
The triode is of course the actual gain device, operating at 15V 2mA. The plate is loaded with a 2SK170-based CCS and direct coupled to a cascoded Jfet White follower.
This *should* give that whimpy little triode pretty much optimal circumstances to do it´s job as a voltage gain stage.
IME this tube is hardly capable of driving anything by itself, but this follower should be a very easy load.

JoshK · 2nd September 2006, 08:38 PM

This circuit looks pretty cool to my newbish eyes. Have you built it yet?

Fuling · 3rd September 2006, 08:33 PM

I´m working on it, will probably finish it tomorrow

Fuling · 5th September 2006, 09:49 AM

The circuit is built and tested and the results are very promising!
50kHz with a IRFP260-based follower on the output is no problem.
I´m planning to run much more tests on this one later, when I can borrow some better test equioment.

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2nd September 2006, 08:38 PM	#2
JoshK diyAudio Member Join Date: May 2004 Location: Toronto, ON	This circuit looks pretty cool to my newbish eyes. Have you built it yet?

3rd September 2006, 08:33 PM	#3
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	I´m working on it, will probably finish it tomorrow

5th September 2006, 09:49 AM	#4
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	The circuit is built and tested and the results are very promising! 50kHz with a IRFP260-based follower on the output is no problem. I´m planning to run much more tests on this one later, when I can borrow some better test equioment.

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