at last, amp finnished

trancy · 31st March 2004, 08:01 AM

so, this is my new amp, mu cf with ecc88 for input stage with gain up to 20 and SE power stage with gain 2 in A class with mosfets. Bias is around 3 A per channel , heatsinks reach around 45 degreees C, output power is around 18 W on 4 ohms...it sounds.....OHHHHHHHHHH........i'm in love....no hum, no buzz....

thank to Federico and mr.Pass for concept

trancy · 31st March 2004, 08:04 AM

another pic...

trancy · 31st March 2004, 08:11 AM

unfinished, bottom and back view...

dhaen · 31st March 2004, 10:08 AM

Nice job

Too many transistors for my likeing

trancy · 31st March 2004, 10:12 AM

only 4

Frank Berry · 31st March 2004, 10:17 AM

Beautiful job.

stigla · 31st March 2004, 10:26 AM

Nice woodwork! And clean and thoughtful internal wiring! Have you compared it to some other amps?

stigla

trancy · 31st March 2004, 11:54 AM

Quote:

Originally posted by stigla
Have you compared it to some other amps?

stigla

I compared it with pass zenV4 (I think in my amp sound is more defined, and bass is smoother), with gainclone (sound is softer) and with one tube amp(I cannot compare)....

AudioGeek · 1st April 2004, 02:08 AM

Great job!!!!

DO you have a schematic, and how did you couple the tube input stage to the mosfet outputs?

DC coupled output, or cap on output?

Thanks!!!!

trancy · 1st April 2004, 05:06 AM

Quote:

Originally posted by AudioGeek
Great job!!!!

DO you have a schematic, and how did you couple the tube input stage to the mosfet outputs?

DC coupled output, or cap on output?

Thanks!!!!

I must find a time to transfer schematic from my head to paper, but actualy, basic concept for power stage is mr. Pass Zen ver1, with some modifications (higher bias and higher input impedance), line stage is common cathode follower with ecc88, they are coupled with cap. Actualy i want to get gain from line stage, current stage should have gain 1 (now is 2, but sounds o.k.)

here is one pic more...

lp

31st March 2004, 10:12 AM	#5
trancy diyAudio Member Join Date: Feb 2004 Location: Slovenia	only 4 __________________ too much is just enough

31st March 2004, 10:17 AM	#6
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Beautiful job. __________________ Frank

1st April 2004, 02:08 AM	#9
AudioGeek diyAudio Member Join Date: Jan 2004 Location: Minnesota	schematic??? Great job!!!! DO you have a schematic, and how did you couple the tube input stage to the mosfet outputs? DC coupled output, or cap on output? Thanks!!!!

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31st March 2004, 10:08 AM	#4
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	Nice job Too many transistors for my likeing

31st March 2004, 10:26 AM	#7
stigla diyAudio Member Join Date: Nov 2001 Location: Trondheim	Nice woodwork! And clean and thoughtful internal wiring! Have you compared it to some other amps? stigla

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