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Quanghao Audio Design Quanghao Audio Design is a producer of DIY Audiophile Kits and PCB boards, selected from many listening tests!

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Old 10th March 2010, 01:58 PM   #1051
Ferrari is offline Ferrari  Netherlands
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1. Strosek: full set
2. boudy : full set
3. ksnider1: full set
4. toufu : (IV + Supply For IV) x 2
5. ferrari: (IV + Supply For IV) x 3
6. analogdiy: full set
7. wobii: full set
8. Cobra2: (IV + Supply For IV) x 2
9. mikelm: full set
10. le´flu: just one salas reg please


Quantity updated (one additional for a friend).
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Old 10th March 2010, 07:13 PM   #1052
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Hi Quanghao,

I sent you an message yesterday thatś somewhat important. Can you get back to me.

Cheers,
dshambala
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Old 11th March 2010, 03:17 AM   #1053
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Quote:
Originally Posted by vzs View Post
I might be cursed and thrown out asking this in a thread with so many tube lovers

Did somebody try a Bride Of Zen ( BOZ ) approach for the line level amplification?
or it's JFet counterpart Jfet BOZ (Lineup version with a bit lower THD ~0.06% or Nelson Pass version from 1st page) ?
In simulations both versions have a very nice, monotonically decaying THD spectrum, as tubes do, with THD from 0.06% to 0.2% depending on parts used.

I don't want to start a dispute between tube vs. fets, just from pure curiosity, as it costs almost nothing, only a good output cap.

Thanks.
Ohh this is OUTRAGEOS!!! *** Just Kidding **

No, I never tried and I don't see why not trying.
I was actually going to design an hybrid tube input mosfet single ended output power amp as an experiment to see if the mosfet stumbles compared to tube power stage. I suspect mosfet is slow compared to tube.
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Old 11th March 2010, 04:59 AM   #1054
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Quote:
Originally Posted by apelizzo View Post
Ohh this is OUTRAGEOS!!! *** Just Kidding **

No, I never tried and I don't see why not trying.
I was actually going to design an hybrid tube input mosfet single ended output power amp as an experiment to see if the mosfet stumbles compared to tube power stage. I suspect mosfet is slow compared to tube.
I have used the following Borbely/Welborne hybrid as a line stage and will use it with a differential output DAC I am experimenting with. As a side comment I have also used 6H6P in the line stage. Sounds good to my ear.

DAC Tube Output Stage Kit

See also the CATO at the same site.

Best
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Old 11th March 2010, 05:20 AM   #1055
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Well the boards are nearly complete.. Just waiting for the last couple of parts, now its time to order the Transformers..

Which types/models is everyone using? I'm open to suggestions as new to this..
I had a look at the R-core R80-36 on ebay for the IV stage, just that the specs don't sound right.
R80-36 260-230-0-230-260(90mA). 2.5-0-2.5(3A).(3.15-0-3.15)X2(3A)
Is this the right one?

What about to run the salas shunts?
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Old 11th March 2010, 06:16 AM   #1056
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Quote:
Originally Posted by CustomHT View Post
Well the boards are nearly complete.. Just waiting for the last couple of parts, now its time to order the Transformers..

Which types/models is everyone using? I'm open to suggestions as new to this..
I had a look at the R-core R80-36 on ebay for the IV stage, just that the specs don't sound right.
R80-36 260-230-0-230-260(90mA). 2.5-0-2.5(3A).(3.15-0-3.15)X2(3A)
Is this the right one?

What about to run the salas shunts?
That's the one I've used. Available also from Diyclub.biz
For Salas I've used two separate 10va 9+9V PCB toroidal transformers: one for Digital section (9V) and another for the two 9V 9V for Analog section. Total 3 transformers

Last edited by apelizzo; 11th March 2010 at 06:23 AM.
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Old 11th March 2010, 06:23 AM   #1057
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Quote:
Originally Posted by CustomHT View Post
Well the boards are nearly complete.. Just waiting for the last couple of parts, now its time to order the Transformers..

Which types/models is everyone using? I'm open to suggestions as new to this..
I had a look at the R-core R80-36 on ebay for the IV stage, just that the specs don't sound right.
R80-36 260-230-0-230-260(90mA). 2.5-0-2.5(3A).(3.15-0-3.15)X2(3A)
Is this the right one?

What about to run the salas shunts?
the Salas shunt need:
2 or 3 : 9-12 V/ min 100mA
You can choice R-core (R26-28) for Salas shunt, It is good

The supply I/V need: 0- 260V min 50mA
The Filament need: 0-9 V min 3A
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Group buy DAC-END R (ES9018) full assembled board
update 06/14/2013 :http://www.audiodesignguide.com/DAC32/index2.html
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Old 11th March 2010, 04:34 PM   #1058
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Location: Magenta (MI)
Hi Quanghao,
I'm started to find a components on web,I check the part list and I found a mistake.
Part list DACEND2 about capacitors 0,01uF are N.4, but on schematics I found 11 components 0,01uF(10nF): I suppose that only C26-C27-C28-C29 are 0,01uF and all othres are 0,1uF (100nF).
That's right?

Thanks
Ivano
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Old 11th March 2010, 05:49 PM   #1059
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Location: Ioannina
What about this transformer, is it ok?

R-Core Power Transformer Tube preamp amplifier 6DJ8 bei eBay.de: Transformers (endet 21.03.10 08:21:16 MEZ)

Primary 117V 50/60Hz , 117V 50/60HZ
Secondary 265V - 0 - 265V ( 50mA ), 6.3V(3A) , 12.6V (1A)

Last edited by prooptiki; 11th March 2010 at 05:52 PM.
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Old 11th March 2010, 06:12 PM   #1060
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Salas shunt powered up and working.
Still waiting for farnell for my remaining parts for my I/V.

First ever DIY electronic project from scratch, nearly done.
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