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Old 17th March 2012, 10:58 AM   #21
piero7 is offline piero7  Italy
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Quote:
Originally Posted by fotios View Post
Attention: OTP

Hey Piero7, i think that i remember you from other thread:
Remote Control Kits of Mr. Mikkel Simonsen.

Fotis
Yes, it was a bad experience
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Old 17th March 2012, 11:04 AM   #22
piero7 is offline piero7  Italy
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Hum in my FU29 was cause of first and second stage vcc filament supply. Trashed the original single diode used, graetz bridge+new big capacitors, no more hum. Plus, I changed the HT supply (one capacitor was really down, plus changed the HT diodes with fast ones). In my FU29 couple capacitors was two fake Wima. I changed these too.
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Old 25th March 2012, 02:14 PM   #23
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Hello,
I also have a FU29 amplifier and I'm planning to do some upgrades.
First I used my multimeter to get the schematics. In the attachments you'll find the circuit of one channel and the PS of both channels.
The mods that I'm planning to do are:
- replace input tube 6N3 with 5670 (2C51) (already done, that was easy :-) )
- Add chokes to PS and make separate PS for left and right channel
- augment the current through the input tubes from 2ma to 4ma
- replace pot with ladder attenuator
- replace critical components with better ones, especially the coupling caps
Regards,
Danny
Attached Images
File Type: gif FU29.gif (22.7 KB, 649 views)
File Type: gif FU29_PS.gif (19.3 KB, 624 views)

Last edited by danny_66; 25th March 2012 at 02:18 PM.
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Old 25th March 2012, 02:17 PM   #24
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And here are the schematics of the updated version that I'm planning to make, if I find some time :-)
For the moment I'm busy with building some speakers, so all my DIY time goes to them first.
Attached Images
File Type: gif FU29_v3.gif (23.0 KB, 628 views)
File Type: gif FU29_PS_v3.gif (27.1 KB, 616 views)

Last edited by danny_66; 25th March 2012 at 02:19 PM.
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Old 15th August 2012, 08:52 PM   #25
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Hello,
I own a modified Revon SE 6L6 mini Amp. (cheap)
Also an Yaqin ML-10 and a YAQIN MS34.
My newest was the Audioromy M-828A, it arrived safely in 2 days from china.
But the sound was a little bit dump.
I changed the LS Control to ALPS 27 Series and add a 7H Chocke in Power Supply.
But the sound was not better. So I ordered pre Amp Tubes for testing.

Then today I received several tubes.
i.e. two USA Penta 5670 from 1973 tubes to exchange the chinese 6N3.
And I exchanged the russian 6n23P to the Phillips 6922 from 1987.
For the Audioromy M-828A this was an great improvement in the soundstage.
Womens Voices will now fly through the room and orchestral music will loose its stiffness.

These two types of tubes are a fantastic match for improvement of the Audioromy M-828A.
Changing the chinese FU29 to the russian GU29 is only a very little step foreward, but changing the 6N23 and 6N3 to Phillips 6922 and Penta 5670WA will change this Amp and take it to another stage in HiFi Ratings.

happy Listening
Dieter
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Old 23rd August 2012, 04:03 PM   #26
mpc561 is offline mpc561  Germany
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Quote:
Originally Posted by technics1 View Post
These two types of tubes are a fantastic match for improvement of the Audioromy M-828A.
Changing the chinese FU29 to the russian GU29 is only a very little step foreward, but changing the 6N23 and 6N3 to Phillips 6922 and Penta 5670WA will change this Amp and take it to another stage in HiFi Ratings.

happy Listening
Dieter
Hello Dieter,
I also got a 828A early this year and use him with Duetta loudspeaker with approx. 89dB. First action was also to replace the chinese 6N3 and 6N23 with russian NOS. Like you already mentioned I agree fully with you that this was the biggest enhancement in sound quality. To replace the 4 fake WIMA coupling capacitors with Mundorf capacitors was only a small enhancement, like to replace the FU-29 tubes with GU-29 NOS too.

But one question. Compared to the Yaqin ML-10 and MS-34 how you classify the modified FU-29 from sound point of view? Better or more worse? More Bass or less? I know it would be a kind of subjective opinion but it would help me to decide if I order a MC-10. (I need a second Tube amplifier and now in the "choosing" phase, MC-13s, MC-10, MC-20, Ballad Audio SP6MK3 are my favorites actually, Budget approx. 600 Euro).

Greetings,
Joerg.
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Old 24th August 2012, 09:39 PM   #27
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Default Comparing Yaqin to Audioromy

For comparing these Amps you need the same Preamp and the same Loudspeakers.
All my Tube Amps are connected to two pairs of Technics SB6000 with 93db and one pair of Technics SB7000 with 95db at 1Watt and 1m.
For Reference I hade a complete chain of Technics Solid State series 9000 with the 9010,9020,9040,9050,9070 and the SLM1 and RS1500 to check the sound.

To my taste the Audioromy is softer than the Yaqin MC10 and the MC10 is softer than the MS34B.
The MS34B is near to HiFi like the Solid State, but sometimes with womens voices, I need this little sidestep from HiFi, which makes these Tube-Amps so delightful.
This impressive little mis-adjustement of the Tube-chain makes the difference from HiFi.
If you use Loudspeakers, which are able to give this to your room and to your ears you will have fun.
Then the music makes fun and will put a smile on your face.

With 90% of the music program I am listening,I think the 2way SB6000 sounded better than the SB7000 3way or the ASW Alpha 4 Way (95db).
This is my impression not my measurement!!! Every measurement is something completely different!!
Happy listening
Dieter

Last edited by technics1; 24th August 2012 at 09:44 PM.
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Old 25th August 2012, 07:58 AM   #28
mpc561 is offline mpc561  Germany
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Quote:
Originally Posted by technics1 View Post
To my taste the Audioromy is softer than the Yaqin MC10 and the MC10 is softer than the MS34B.
The MS34B is near to HiFi like the Solid State, but sometimes with womens voices, I need this little sidestep from HiFi, which makes these Tube-Amps so delightful.


Happy listening
Dieter
Thanks Dieter,
this is exactly what I want to hear. Your opinion.

Greetings,
Joerg.
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Old 20th May 2014, 07:39 PM   #29
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This is not a single ended amp... so why would you expect it to sound like one? Either way it is pretty hard to beat it's performance for the money. It easily trounces the Stereo 70.

I have had one of these for about 2 1/2 years now. Mine is the second version that has been sold over the years. Has been totally reliable except the Chinese tubes. I;ve been using NOS RCA outputs with Russian drivers and inputs. I do notice a little bit of hum in it and people with highly efficient speakers also notice this to a larger degree, so starting by modifying the power supplies would make much more sense unless yours has some failed parts in it. I have one here for service right now that has a bias issue so it will be interesting to see what's up with it.

Mark

Last edited by Mark Allen; 20th May 2014 at 07:46 PM.
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Old 28th June 2014, 11:16 PM   #30
AJT is offline AJT  Philippines
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i had this amp sent to me for repairs...
the 829b tube on one channel tends to red plate...
so what i did was to convert this amp to cathode resistor bias
by cutting the negative supply line to the grid and
installing cathode resistors and grid leaks to ground...
so now this amp did not require fiddling with bias pots no more...
and as far as sound quality goes, the owner did not detect any difference
in sounds before and after the mods...
this is one such "hot" amp....
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File Type: jpg IMG_4566.JPG (534.9 KB, 30 views)
File Type: jpg IMG_4571.JPG (464.6 KB, 32 views)
File Type: jpg IMG_4577.JPG (703.3 KB, 29 views)
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