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Old 3rd June 2005, 04:14 PM   #1
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Default 5902 amp schematics?

Hello. I'm interested in building an amp using two 5902 sub-mini tubes.
I'm having some trouble finding schematics of amps using these tubes. I would like to run them push-pull, cathode bias.
Any and all info is welcome.

Thanks,
Anthony
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Old 5th June 2005, 11:39 AM   #2
RE 604 is offline RE 604  Germany
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Hello Anthony ,
look here :

http://www.jogis-roehrenbude.de/Lese...rmann-Mini.htm

It is single - ended , but maybe a help .
Regards , Alexander .
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Old 5th June 2005, 08:41 PM   #3
RE 604 is offline RE 604  Germany
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Here is the second link :

http://www.roehrentechnik.de/html/kolibri.html

Regards , Alexander .
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Old 7th June 2005, 06:55 AM   #4
mwiebe is offline mwiebe  United States
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Alexander, thanks for posting those links.

I have been using a 955 (acorn) driving a P-P 5902 triode connected to drive a Klipsch La Scala for a few years. However both driver and power tubes are battery biased, 1.2V and 6V respectively. I use the small Hammond 125C as outputs. I don't have a schematic to share but my B+ is 110V. Nice sounding amp and I've been meaning to play around a bit more with it--also try a pentoded 5902 as a driver. So by all means dive into your project.
Matt
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Old 9th November 2011, 09:16 PM   #5
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Default 5902 push-pull amp from Italy

Folks,

If I may add a link on 5902 amplifiers: there is a push-pull amplifier project posted on the "Radio di Sophie" site, run by Italian hobbyists. I have built a prototype (single channel) of Nicola del Ciotto's amplifier and it sounds good, but needs a preamp capable of providing 10V RMS output (or more).

The following document provides all information including PCB layout:

http://www.leradiodisophie.it/Downlo...to-Amp5902.pdf

(If anyone wonders: Sophie is (or was) an Abessynian cat with impressive looks, that liked to sit on working valve radios !)

Best regards,

Aren van Waarde (aka arensattic)
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