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Old 2nd May 2005, 11:21 PM   #1
abmoggy is offline abmoggy  United States
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Default What can I do with 3Q4 Pentode tubes?

Hello,

I just got my hands on a pile of these small Tung-Sol 3Q4 power pentode http://www.mif.pg.gda.pl/homepages/f.../127/3/3Q4.pdf and am wondering if I can build something out of them. They have a max power output of 250 mw so can I parallel (x3, x5, etc)them in a SE configuration a la http://www.tubecad.com/september99/page12.html or can I use them as output tubes for a headphone amp?

Any suggestions? Thanks!
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Old 3rd May 2005, 09:40 AM   #2
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if you connect them into triodemode you can build a SRPP preamplifier..
http://home.swipnet.se/dice/srpp/triatic_srpp.JPG
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Old 3rd May 2005, 10:32 AM   #3
Yvesm is offline Yvesm  France
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Quote:
Originally posted by Mr. Triatic
if you connect them into triodemode you can build a SRPP preamplifier..
http://home.swipnet.se/dice/srpp/triatic_srpp.JPG
But you'll need 2 independent batteries for the heathers

As a tubed headphone amp, it is highly improbale you may work without an OPT.

Yves.
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