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Ganged switching power supply for a tube amp.
Ganged switching power supply for a tube amp.
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Old 1st April 2020, 12:08 AM   #51
kodabmx is offline kodabmx  Canada
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Ganged switching power supply for a tube amp.
This one in particular is marginal. I've used it for a phono stage with success before, but I feel 160mA@150V might be pushing it for this supply. It was struggling with 25mA@330V...
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Old 1st April 2020, 11:05 AM   #52
indaco is offline indaco
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By the way, I found in your country this one:

Quiet Power Supply for Tube Amp - Tube Amp Kits by London Power

Although not so cheap, it would seemed to be SMPS...but I'm not sure.
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Old 2nd April 2020, 03:31 AM   #53
PRR is offline PRR  United States
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Ganged switching power supply for a tube amp.
> seemed to be SMPS...but I'm not sure.

Keep clicking the options.
Click the image to open in full size.
It is a plain old linear supply with 50/60Hz transformer.

The transistors on fins are for Kevin's variable-voltage scheme to make big guitar amps distort at less loud level.
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Old 2nd April 2020, 10:58 AM   #54
indaco is offline indaco
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Quote:
Originally Posted by PRR View Post
> seemed to be SMPS...but I'm not sure.

Keep clicking the options.
Click the image to open in full size.
It is a plain old linear supply with 50/60Hz transformer.

The transistors on fins are for Kevin's variable-voltage scheme to make big guitar amps distort at less loud level.


Yes, I realized then it by a better reading...with the TX furnished, the big caps and mosfets it could be only that.
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Old 16th April 2020, 01:34 PM   #55
moapys is offline moapys  United States
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Quote:
Originally Posted by PRR View Post
> seemed to be SMPS...but I'm not sure.

Keep clicking the options.
Click the image to open in full size.
It is a plain old linear supply with 50/60Hz transformer.

The transistors on fins are for Kevin's variable-voltage scheme to make big guitar amps distort at less loud level.

...@PRR - Might you have a link for both the board/tranny above, as well as the referenced "Kevin's variable-voltage...guitar-amp...distort at lower level" comment?

Thanks very much!
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Old 17th April 2020, 12:10 AM   #56
PRR is offline PRR  United States
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Ganged switching power supply for a tube amp.
> @PRR - Might you have a link for both the board/tranny above

There's no direct link; different options give different choices and images. Keep clicking the options!

There's also technical papers on the site carefully explaining Kevin's techniques.
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File Type: gif London-PS-PT-42.gif (54.7 KB, 47 views)
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Old 17th April 2020, 04:26 PM   #57
moapys is offline moapys  United States
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Ah; Kevin ...at LondonPower.com - - got it / great site: THX!
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Old 14th May 2020, 10:53 PM   #58
kodabmx is offline kodabmx  Canada
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Ganged switching power supply for a tube amp.
Just an FYI for those who are interested...

If you use this, you can use the 18V winding to boost or buck for more voltage choices.

500W 12VDC transfer 18VAC & 0-220v-380v inverter module | eBay

Yesterday, using the 160V winding into a doubler, and using an ATX supply that can sag, I was getting 277V out. Today I configured it to boost by 18V and I now have 313V just like I should.

For every 1V difference in input voltage, the output of 380V (full winding) changes by ~32V

In addition to the 160 220 and 380 volt outputs it comes with, you also get 142 172 202 238 362 and 398 volts, too (depending on if you boost or buck) and that doesn't count using a doubler.

Also, the one I measured today runs at 21.8 kHz if anyone cares.

Koda
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