Fu29 & e813cc

piero7 · 20th August 2009, 03:07 PM

The schematic diagram of this china amp is wrong! The first tube is the 6N2 and the second is 6N1 and there are some other small differences... argh!

Anyway, after some days playing, the new E813CC mounted on this ampli sounds very very good! It is a good tube! Microfonicity is near to zero...

tmagell · 12th November 2009, 05:24 PM

In researching this amp I stumbled on your post... please help me, so it looks that you're using 12ax7 as the middle tubes, is that correct? Did you had to change any wiring? and what about the outside tubes? Any recomendations? Really triying to change from the original 6N1- 6N2 tubes, and I too thought that the middle ones where the 6N1's! Really appreciate if you could clarify that!

Thanks
Tomas

piero7 · 12th November 2009, 06:41 PM

You are right they shipped the ampli with tubes inverted

Due a damaged socket I discover it late I made these pics sorry

To use 12AX7 you only need to rewire filaments

barretter · 2nd March 2010, 10:28 AM

I don't think that is right. I have one of these amplifiers and when I traced the input it went to the two inner valves. On the circuit diagram these are 6N1/ECC88s.

milosz · 11:12 AM

I just got an Audioromy FU29 which was advertised by it's seller as being a SINGLE ENDED amp. I dug around in the thing and from my ohmmeter it sure looks like the 2 plates of the 829 are at opposite ends of the output transformer primary winding, with B+ fed to the tube via the center tap. That is a classic PUSH-PULL topology- NOT single ended!!!!!

Anybody here have any comment?

(It's a decent sounding amp, in particular better low frequency performance than I expected; but it's advertised all over as a SINGLE ENDED AMP and it sure looks like it's a push-pull design.)

20th August 2009, 03:07 PM	#1
piero7 diyAudio Member Join Date: Apr 2009 Location: Matera	Fu29 & e813cc The schematic diagram of this china amp is wrong! The first tube is the 6N2 and the second is 6N1 and there are some other small differences... argh! Anyway, after some days playing, the new E813CC mounted on this ampli sounds very very good! It is a good tube! Microfonicity is near to zero...

12th November 2009, 05:24 PM	#2
tmagell diyAudio Member Join Date: May 2005 Location: CA	Audioromy FU29 In researching this amp I stumbled on your post... please help me, so it looks that you're using 12ax7 as the middle tubes, is that correct? Did you had to change any wiring? and what about the outside tubes? Any recomendations? Really triying to change from the original 6N1- 6N2 tubes, and I too thought that the middle ones where the 6N1's! Really appreciate if you could clarify that! Thanks Tomas

5th April 2010, 11:10 AM	#5
milosz diyAudio Member Join Date: Oct 2006	Audioromy FU29 - NOT single ended I just got an Audioromy FU29 which was advertised by it's seller as being a SINGLE ENDED amp. I dug around in the thing and from my ohmmeter it sure looks like the 2 plates of the 829 are at opposite ends of the output transformer primary winding, with B+ fed to the tube via the center tap. That is a classic PUSH-PULL topology- NOT single ended!!!!! Anybody here have any comment? (It's a decent sounding amp, in particular better low frequency performance than I expected; but it's advertised all over as a SINGLE ENDED AMP and it sure looks like it's a push-pull design.) Last edited by milosz; 5th April 2010 at 11:12 AM.

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2nd March 2010, 10:28 AM	#4
barretter diyAudio Member Join Date: Apr 2003 Location: West Yorkshire, UK.	I don't think that is right. I have one of these amplifiers and when I traced the input it went to the two inner valves. On the circuit diagram these are 6N1/ECC88s.

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