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Old 29th August 2003, 04:52 PM   #1
Raj1 is offline Raj1  United Kingdom
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Default tube rectifier and tda 1543

Hi,

I have a few tda 1543's, and I am interested in using a tube rectifier if at all possible, to run the dac chip which only uses a 5v supply, I'm not sure if tube rectifiers are available to operate at this level.

Does anyone know if this is possible and how?

Thanks
Raja
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Old 30th August 2003, 10:28 PM   #2
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Hi,

What's the motive for picking a tube rectifier?

Anything's possible but I think you may be best of with the appropriate Schottky rectifiers.

Cheers,
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Old 30th August 2003, 10:57 PM   #3
316a is offline 316a  England
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Default Beast Rectifiers

There are some rectifiers out there that could probably provide the current (dampers such as PY500a) but you'll still have to use a voltage regulator . Unlikely that any single rectifiers could provide enough current for the entire DAC . Franks's right , schottkeys are the way to go , just open up a Farnell catalogue and the choice is huge .

As an aside I have actually dabbled with valve rectifiers providing low voltage supplies and it was not easy (or small!) to implement . The design lit up the filaments of a pair of 11LE3 battery valves and used PY801's for rectification running choke-loaded from a 48-0-48v supply and DN2540 depletion msofets as current sources . This power supply scheme actually dwarfed the line stage it was designed to power and quite frankly I never got round to finishing it : far too impractical ! If anyone has managed this with a 2A3 I'd like to know !

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Old 30th August 2003, 11:20 PM   #4
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If you are looking to do something different for a power supply.....

Try a conventional diode bridge with a choke (inductor) input for filtering, what some people identify as an L-C-L-C filter.

If you want to go the next step, try a shunt regulater, fed by a constant current source.

Alan Wright's interesting "Tube Preamp Cookbook" gives some interesting comments.

http://www.vacuumstate.com/

Just a thought,

Aud_Mot
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Old 31st August 2003, 07:50 AM   #5
Raj1 is offline Raj1  United Kingdom
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Default tube rec's

Hi,

Thanks
for the replies,

Yes I would like to do something different, just wondered what sort of sound I would get if this was possible,

http://www.zandenaudio.com/products/english/index.html

similar to this, but thats tda 1541,

would like less of a solid state sound from my cd's.

Thanks
Raja
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Old 31st August 2003, 08:16 AM   #6
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Default Re: tube rec's

Quote:
would like less of a solid state sound from my cd's.
Hi,

If that is goal then hook-up a single triode amplifying stage behind your DAC. Bias it to some non-linear region, et voila you get all the harmonics tubes are (partly) famous for. For sure you get a much less solid state sound.

But to me this appears to be the same as using an air refresher on the toilet

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Old 31st August 2003, 08:18 AM   #7
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As schottkys don't come close to vacuum rectifiers i've also been tempted to use vacuum rectification with a SS circuit. It should be possible to use almost any rectifier provided you're prepared to drop a lot of volts across the regulator.
Btw it's not obvious from the link to Zanden that they actually use vacuum power for the DAC. It may just be for the output valve.
Any idea what the freaky air-cored coils are for?
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Old 31st August 2003, 08:28 AM   #8
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Quote:
Originally posted by analog_sa

Any idea what the freaky air-cored coils are for?
Hmm,

I only see a load of potcores. I appears to me that it is a passive anti-alias filter. Can't imagine that it is a PSU smoothing filter.

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Old 31st August 2003, 09:19 AM   #9
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Quote:
It appears to me that it is a passive anti-alias filter

The coils are for their patented notch filters ( output stage ).
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Old 31st August 2003, 06:00 PM   #10
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Hi,

Quote:
As schottkys don't come close to vacuum rectifiers i've also been tempted to use vacuum rectification with a SS circuit. It should be possible to use almost any rectifier provided you're prepared to drop a lot of volts across the regulator.
This can be and has been done before.

You don't even need to drop all that much voltage, a choke input filter would help here already.

Cheers,
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