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Old 5th December 2006, 02:27 PM   #1
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Default Found a power transformer, what to do with it?

OK, first of all, I'll admit right now that this is kind of a backward way of doing things. Usually you set your eyes on a tube you want to play with before designing/searching a design that you like. Well, I just happened to find a power transformer but I've no idea what I could do with it. The secondary is rated 120V/0.6A (no CT). However, since the primary winding is rated for 220V and my mains is 230V, I get a bit more voltage from the secondary (about 136V no-load). I also have some other stuff lying around, like some tube sockets etc. I did a few simulations on PSUD, and I could build a nice 150-160V B+ supply out of this transformer. OK great! But what to power with it? Anything goes; preamps, headphone amps, power amps. Suggestions?
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Old 5th December 2006, 03:01 PM   #2
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A number of low- voltage tubes can be used - unlikely you'll need much of the 600 mA capacity. One more possibility - you could get about 160 mA at 300V with a doubler. Plenty for a stereo SE amp, or mono push-pull.
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Old 5th December 2006, 10:55 PM   #3
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Blacklight,

Tom Bavis give a GOOD hint in mentioning a voltage doubler. Your trafo will supply the B+ needs of an "El Cheapo". "El Cheapo" is an "integrated" amp that reaches full power when driven by a CDP.
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Old 5th December 2006, 11:54 PM   #4
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Old 5th December 2006, 11:57 PM   #5
Sherman is offline Sherman  United States
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How about an Aikido using 6922 valves? Should be pretty happy at the B+ your trafo can provide.

Or maybe a headphone amp?
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Old 6th December 2006, 12:03 AM   #6
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Old 6th December 2006, 12:15 AM   #7
arnoldc is offline arnoldc  Philippines
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WE417A / 5842 transformer-coupled headphone amplifier
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Old 6th December 2006, 12:42 AM   #8
paulb is offline paulb  Canada
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Default Re: Found a power transformer, what to do with it?

Quote:
Originally posted by blacklight
OK, first of all, I'll admit right now that this is kind of a backward way of doing things.
Not according to my way of thinking...
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Old 6th December 2006, 06:25 AM   #9
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Ha! paulb: point taken. Wow, I never thought I'd have this many replies. Thanks for all the suggestions. I did concider that voltage doubler, and while it does seem attractive, I think I'll have to do it another time (I may be able to get my hands on another of these trafos). Looks like I'll be building an Aikido Low impedance headphone amp, since that's something I need. Thanks all, you've been most helpful, again.
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