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Given one 12AX7 how would you run it given the rest of the amp is SS?
Given one 12AX7 how would you run it given the rest of the amp is SS?
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Old 20th February 2020, 08:22 PM   #71
Gnobuddy is offline Gnobuddy  Canada
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Join Date: Mar 2016
Quote:
Originally Posted by Printer2 View Post
...I have other voltages...
In case it's useful: a lot of HP inkjet printers have a 32 volt DC power supply, and I've seen these in a Value Village or other thrift store many times. Most of the time the HP power supply has an oddball 3-pin connector, with zero, +16V, and +32 volts on the three pins.

These make good op-amp power supplies with a little additional RC filtering, and they may be good for feeding the 400 volt step-up switching power supply too.


-Gnobuddy
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Old Yesterday, 03:26 AM   #72
Printer2 is offline Printer2  Canada
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Join Date: Apr 2010
Quote:
Originally Posted by Gnobuddy View Post
In case it's useful: a lot of HP inkjet printers have a 32 volt DC power supply, and I've seen these in a Value Village or other thrift store many times. Most of the time the HP power supply has an oddball 3-pin connector, with zero, +16V, and +32 volts on the three pins.

These make good op-amp power supplies with a little additional RC filtering, and they may be good for feeding the 400 volt step-up switching power supply too.


-Gnobuddy

The 32V ones only do about 0.5A (too lazy to run downstairs to check). The 12V ones I want to see 2.5A minimum. The most I seen is 60W out of a brick. 19V looks like it might be ideal in terms of a Class D amp given the voltage and current ratings. I can see a 12V for heaters and another brick to boost up for the HV for a 30W tube amp. One day I have to catalog what I have for voltages and current ratings. At $2-5 in the thrift stores it looks like adapters are my version of a woman's shoe fetish. I have resolved to stop buying them. That is unless I come across really small ones in the 25-35V range for bias supplies.
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