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Old 9th February 2006, 10:10 AM   #1
tta60 is offline tta60  Viet Nam
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Default SE Triode amp for a newbie

Friends!
My new madness is to do it myself in making a SE triode amp (3w)! And I badly need help: a schematic, a part list for something simple, cheap that should give nice results with a pair of Fostex full range drivers.
Thank you very very very much!
TTA
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Old 9th February 2006, 10:22 AM   #2
Fuling is offline Fuling  Sweden
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Cheap and simple 3W SE DHT, hmm...
2A3 or 6B4G (Sovtek single plates), Hammond 1627SE OPTS´s, a simple RC-coupled triode input/driver stage and a tube rectified CLC power supply.
2A3 should work with AC filaments but 6B4G needs DC heating to avoid hum.
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Old 9th February 2006, 11:21 AM   #3
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Is 3 w enough - how many dB are your Fostex ?
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Old 9th February 2006, 10:13 PM   #4
arnoldc is offline arnoldc  Philippines
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A popular choice- JE Labs 2A3 in two flavors. One is at www.angela.com site.
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Old 10th February 2006, 03:09 AM   #5
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If DHT is not mandatory, costs can be held down by using a triode wired multigrid tube. 6AQ5s are inexpensive and 12AQ5s even more inexpensive, but not as plentiful. Either 'AQ5 variant will do fine driven by 1/2 of a 5965. Hammond 125ESE O/P trafos are about as low cost as can be, while offering OK performance.

SS B+ rectification by UF4007 diodes combined with a low cost snubber network is quite good sounding and will cost less than vacuum rectification.
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Old 10th February 2006, 03:23 AM   #6
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Cheap, simple, parts are easily obtained. Go nuts.
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Old 10th February 2006, 04:27 AM   #7
andrei is offline andrei  Canada
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Or you could do a single-bottle amp around 6DN7...
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Old 10th February 2006, 03:09 PM   #8
Sheldon is offline Sheldon  United States
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They don't come much simpler than this: http://www.the-planet.org/6EM7.html You could also, as Eli said earlier, sub in ss diodes. If you do that, you might want to reduce the power transformer voltage about 10%.

Or this: http://www.enjoythemusic.com/magazin...2/levinson.htm

Either of these will give a watt or two. Depending on the size of your room, may be plenty.

Sheldon
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Old 22nd February 2006, 11:07 AM   #9
tta60 is offline tta60  Viet Nam
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Friends,
Thank all of you that have tried to give me a hand. What I've got in this moment is a pair of Russian made 6C33C. The wonderamp that I'll build around these tubes should make a pair of speakers made based on Fostex FE 206E drivers following the producer's cabinet design.
Again advises, suggestions, schematics etc. needed.
Thanks a lot and best regards,
TTA
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Old 22nd February 2006, 11:11 AM   #10
tta60 is offline tta60  Viet Nam
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Oh, sorry!
I wanted to say that the amp should make the speakers sing. Nicely and safely!
TTA
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