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Old 12th July 2005, 04:22 PM   #1
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Question Tube rectification for SS cicuit

I have seen lots of tube circuits with solid state rectifiers, but I have never seen the opposite. Is there a reason to not use a tube rectifier in a solid state circuit?
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Old 12th July 2005, 05:41 PM   #2
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Well, considering typical effective resistance is in the range of 100 to 600 ohms, I think that pretty well answers it.

If you want to make a high voltage, low current SS circuit, with output transformer to match the high current speaker to the amplifier, you are welcome to do it. Kind of redundant though.

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Old 12th July 2005, 08:08 PM   #3
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Quote:
Is there a reason to not use a tube rectifier in a solid state circuit?

It's not easy. Obviously the 'standard' tube rectifiers are not really suitable for currents in excess of 250-300mA which rules out power amps. For preamps/cdplayers/dacs vacuum tube rectifiers should be fine but would likely drop a lot of voltage. Unless regulation is involved this may be a problem. Mercury rectifiers, otoh, are readily suitable for preamp duties.

So, why haven't i tried it? I guess i still haven't found a SS circuit deserving of all this loving care. A tube powered DAC would certainly look deliciously perverse if you're into digital.
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Old 12th July 2005, 11:34 PM   #4
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Originally posted by analog_sa
So, why haven't i tried it? I guess i still haven't found a SS circuit deserving of all this loving care. A tube powered DAC would certainly look deliciously perverse if you're into digital.
The circuit in question I was thinking about is for a NOS DAC. The current it draws is pretty small, certainly les than 100mA ... maybe I'll look into it?
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Old 16th July 2005, 09:43 AM   #5
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Default Re: Tube rectification for SS cicuit

Tube rectifiers...big, expensive, voltage loss up to tens of volts, low current, low efficiency, need heating, short life...

In high power solid-state circuits, the current is too small; in small signal ones, the voltage is too high.

And it's not like tube ampilfiers, which benefits the sound.

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Originally posted by dsavitsk
I have seen lots of tube circuits with solid state rectifiers, but I have never seen the opposite. Is there a reason to not use a tube rectifier in a solid state circuit?
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Old 16th July 2005, 10:59 AM   #6
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And it's not like tube ampilfiers, which benefits the sound.
Oh, yeah? You sure about this?
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Old 16th July 2005, 11:04 AM   #7
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Quote:
The circuit in question I was thinking about is for a NOS DAC

Go for it. In any case you'll have lots of regulators so uncertainties about voltage drop are less of an issue. It may be a good idea to use some kind of high voltage preregulator as it will allow tube rolling without undue excitement
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