| 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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| Sch3mat1c |
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.
Tim |
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| analog_sa |
| 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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| dsavitsk |
| quote: | 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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| Kenshin |
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.
| quote: | 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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| analog_sa |
| quote: | | And it's not like tube ampilfiers, which benefits the sound. |
Oh, yeah? You sure about this? |
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| analog_sa |
| 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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