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Old 8th May 2012, 01:42 PM   #31
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Location: ontario,london area
oops wrong link Click the image to open in full size.
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Old 3rd June 2012, 10:33 AM   #32
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Location: Brighton, UK
I've bought another board. Bi-amping, here we come...
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Old 5th March 2015, 07:03 PM   #33
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Hiya
Long time no post.
Finally got that 35vDC Fully Regulated supply built for my 4ch 6n11/3886 gainclone built (pics to follow).
YES, THESE BOARDS CAN HANDLE A REGULATED 35V DC POWER SUPPLY.
And they sound gorgeous.
No-one can tell on mine if the volume is set to MAX or MIN.
I've got two of the afore mentioned 6N11/3886 boards in a full dual mono-block implementation with a derivation of the PSU circuit I also mention in an earlier post, with a slight re-design to accommodate the chassis' 80-0-80v transformers. Yeah, the regs get a bit warm... Wadaya gonna do???
LOL
Sounds bloody lovely on my new Dundee6s
cw

Last edited by copperweed; 5th March 2015 at 07:03 PM. Reason: clarity
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Old 5th March 2015, 07:14 PM   #34
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http://www.diyaudio.com/forums/attac...-psuschem1.jpg

I pulled the 4700uFs and used 2200uFs @63V instead, and also increased the zenner diode's 3K9 feed resistors to 4K7 ohms, but that's about it folks.

cw
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Old 5th March 2015, 11:28 PM   #35
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Got sum pics up here

Scrap-lifier MkII; 4ch, 50w, Fully Regulated 35-0-35 PSU. Sounds Amazing! | Alacrity Audio

cw
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Old 6th March 2015, 12:45 PM   #36
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The donated chassis was a Sherwood 200W monster of a power-amp. The main boards had gone down and were cooking the transformers. It was a full dual mono-block design to start with, so I just had to replace the boards and include a supply regulator to drop the 80-0-80 float-voltage to a more manageable 35-0-35.
I tried to fit a volume-control, but the fascia stands so far off the front of the chassis that the potentiometer stem does not reach through the aluminium extrusion.
:-)
'First-World' problems...
Fascia-plate being a right-royal PITA to get it pretty, if I'm honest. I just haven't got the time or patience (or space!!!) for spray-painting. Might make a new one in our usual perforated ali.
More pics when we've got more done.
Any questions about our 35-0-35 vdc, 12-0-12 adc Power regulators?
cw
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Old 18th October 2015, 11:30 AM   #37
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Hallo copperweed.
I've also ordered the Boards from Jims- Audio Ebay Store HongKong.
Than they are fully assembled with my own Parts- mostly German Distributor.
The PSU- Capacitors are KG Nichicon 15000F/50V ordered by HifiCollective in UK.
The Sound also impressed me. So i began to Test different familar Tubes, like: 6N23P;
6922EH; 6N1P; 6N1P-I; 6N1P-EV. It Ends up that i was in Twise about the Plate- Voltage by reading in Forum. I tell that Question to an Expert, he is also Distributor
Vacuumtubes and needed Parts.
I think he crossed Hands above his Head and thays "oh Man".
After his anthwer i ordered a customize toroid Transformer with all needed Voltages.
Core: 150VA, 24-0-24V, Heating:6,3V 0,5A, Plate Voltage in three 3!!! Steps 0-60-75-95V with some mA.
I tested out everyone for a Wile and end up with the highest 95VAC Voltage.
In my opinion THAT is the way to get more Sound out by this Hybrid Amp, not only by
higher Ub for the LM3886.
The Input Buffer, i feel, can better work in optimal Condition (higher Current Workpoint?) with higher Plate Voltage.
If possible you should test it out.

Regards.
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Old 13th December 2015, 06:53 AM   #38
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Default Transformer question

Ive been eyeballing this intriguing project for a while now. I have one toroidal transformer handy and I hope I can make it work. It's 28-0-28 4A with taps at 18-0-18 .3A. So the voltage is a bit high but ok as voltage is concerned, will the 4A affect anything negatively? It would be poetic to make the 18v work for the tube/pre section but no biggie if I have go another direction there.
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Old 1st March 2016, 02:43 PM   #39
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Quote:
Originally Posted by Dondragonfly View Post
Ive been eyeballing this intriguing project for a while now. I have one toroidal transformer handy and I hope I can make it work. It's 28-0-28 4A with taps at 18-0-18 .3A. So the voltage is a bit high but ok as voltage is concerned, will the 4A affect anything negatively? It would be poetic to make the 18v work for the tube/pre section but no biggie if I have go another direction there.
Hi Dragonfly. Hope your project went well (4A taps should give plenty of current). There are some links under the board to separate the tube supply, but on my boards the components are missing so I haven't tried.
One thing I have found to work well is to supply the tube heaters with a pre-regulated supply. I'm using a 9v wall-wart.
cw
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