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Old 15th November 2002, 01:52 AM   #1
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Default power supply for tube preamp

Hi.

Im building a tube mic preamp and I would like to know your opinions about the power supply.

Should I use the original power supply rectified with 6X4 miniwatt tube or should I go with the alternate diode one?

What would be the best option?
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Old 15th November 2002, 02:00 AM   #2
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Default TUBE MIC.

Hi,

IMO take the original one and if you can post a circuit we can even improve that.

You may not like what the diodes do and if you don't have a stiff PSU that's well isolated from the rest of the amplification circuit you're bound to hear it in the recording.

Just my 2 euronickels,
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Old 15th November 2002, 03:57 AM   #3
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Default Tape OP?

Would this be the Mic pre in the tape op mag?
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Old 15th November 2002, 11:50 AM   #4
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Default Here goes the original power supply

Note that this is not for a tube mic, but for a tube mic PREAMPLIFIER

Thanks
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Old 15th November 2002, 12:04 PM   #5
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Default And the alternate one

Also would like to know if you can tell me the resistence for R6 and R11. Im using 110V. I dont know, but theres a text file that says that this resistors depends on input voltage.
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Old 15th November 2002, 12:04 PM   #6
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Default INVALID ATTACHMENT

Hi,

The .bmp file you posted doesn't seem to be valid.

Ciao,

I was too fast it would seem.

Works now so ignore my post.

Thanks,
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Old 15th November 2002, 12:05 PM   #7
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Default look again

look again
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Old 15th November 2002, 12:33 PM   #8
Joel is offline Joel  United States
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What's wrong with the first one? Capacitance maybe a bit low, but other than that, looks ok.
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Old 15th November 2002, 12:45 PM   #9
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Default PSU

Hi,

The tube PSU would certainly benefit from choke filtering and some good quality polypropylenes or PIOs behind it.

The SS one has an extra 48 VDC regulated but what is that for?
I can't see it in the tube PSU.

Cao.
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Old 15th November 2002, 03:00 PM   #10
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Default PSU filter

Quote:
Originally posted by fdegrove
Hi,

The tube PSU would certainly benefit from choke filtering and some good quality polypropylenes or PIOs behind it.


Cao.
Can you porvide more information on how to do it?
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