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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 5th February 2010, 02:47 PM   #521
vzs is offline vzs  Europe
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Default Low voltage tubes?

Quote:
Originally Posted by adamus View Post
yes it can, but it would need a redesign of the PSU (i would forget using the PS pcb, unless you want to keep the filament supply section) and then as you say, changing values.

if you are worried about the voltage.... read read read, then bite the bullet and do a high voltage project.,
The PSU pcb could remain, the 6.3V filament supply is OK, only the high voltage part must be adapted for lower voltage, 12 or 24 V.

A single simpler transformer could be used that would fit all.
And yes, maybe I'm worried a bit of the high voltages and if there is an alternative I would try that.

Is somebody who can help on this?

Thanks!

Last edited by vzs; 5th February 2010 at 02:59 PM.
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Old 5th February 2010, 03:08 PM   #522
apelizzo is offline apelizzo  Australia
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Quote:
Originally Posted by vzs View Post
The PSU pcb could remain, the 6.3V filament supply is OK, only the high voltage part must be adapted for lower voltage, 12 or 24 V.

A single simpler transformer could be used that would fit all.
And yes, maybe I'm worried a bit of the high voltages and if there is an alternative I would try that.

Is somebody who can help on this?

Thanks!
I had similar aversion and fear towards tube amplifiers.. until I've heard the sound, then all fear went away including my solid state amplifier.

There are low voltage tubes, I know a company using for buffering CD players output. But I don't think you should trade good performance for volts. You need to be methodic and careful as there is a level of danger. First until you are confident work with only one end on HV parts the other keep it in your pocket so if it happens the current does not go from one hand to the other through your heart.

I'll find out anyway if you wish to get used to HV little by little. But this project is mostly all on PCB...
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Old 5th February 2010, 03:21 PM   #523
quanghao is offline quanghao  Viet Nam
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Im Finis DAC-end2! that is ok! Can you see!
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Old 5th February 2010, 03:24 PM   #524
quanghao is offline quanghao  Viet Nam
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and
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Old 5th February 2010, 03:33 PM   #525
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by tassosk View Post
Can I use 180uF/20V Oscons instead 220uf? BOM says 100-220uf
That is Ok!
you can use 100- 220uf max!
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Last edited by quanghao; 5th February 2010 at 03:35 PM.
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Old 5th February 2010, 03:37 PM   #526
le´flu is offline le´flu  Germany
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Hi Quang Hao,
looking great...... very good work.
Where did you get the housing?

Greetings Ulf
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Old 5th February 2010, 03:44 PM   #527
quanghao is offline quanghao  Viet Nam
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I do not understand this :
**Where did you get the housing? ***
Can you show me please???
Thank you!
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Old 5th February 2010, 03:48 PM   #528
le´flu is offline le´flu  Germany
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Hi,
i meant:
where did you buy the box / cabinet / case or what ever
the right word is ;-)

Greetings Ulf
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Old 5th February 2010, 03:52 PM   #529
quanghao is offline quanghao  Viet Nam
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Quote:
Originally Posted by le´flu View Post
Hi,
i meant:
where did you buy the box / cabinet / case or what ever
the right word is ;-)

Greetings Ulf
Oh! now I seen! thank! I buy in the shop in China eshopdiclub.biz
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Old 5th February 2010, 04:21 PM   #530
adamus is offline adamus  United Kingdom
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post 524 the salas reg is lit up on the right, yet from the pic no wire from transformer. Have you routed power from another salas reg under the boards?
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