SE Triode amp for a newbie

tta60 · 9th February 2006, 10:10 AM

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

Fuling · 9th February 2006, 10:22 AM

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.

rick57 · 9th February 2006, 11:21 AM

Is 3 w enough - how many dB are your Fostex ?

arnoldc · 9th February 2006, 10:13 PM

A popular choice- JE Labs 2A3 in two flavors. One is at www.angela.com site.

Eli Duttman · 10th February 2006, 03:09 AM

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.

Geek · 10th February 2006, 03:23 AM

Cheap, simple, parts are easily obtained. Go nuts.

andrei · 10th February 2006, 04:27 AM

Or you could do a single-bottle amp around 6DN7...

Sheldon · 10th February 2006, 03:09 PM

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

tta60 · 22nd February 2006, 11:07 AM

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

tta60 · 22nd February 2006, 11:11 AM

Oh, sorry!
I wanted to say that the amp should make the speakers sing. Nicely and safely!
TTA

9th February 2006, 10:10 AM	#1
tta60 diyAudio Member Join Date: Jan 2006 Location: Hanoi	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

10th February 2006, 03:09 AM	#5
Eli Duttman diyAudio Member Join Date: Apr 2004 Location: Plainsboro, NJ	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. __________________ Eli D.

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9th February 2006, 10:22 AM	#2
Fuling diyAudio Member Join Date: Aug 2001 Location: Sweden (Mora)	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.

9th February 2006, 11:21 AM	#3
rick57 diyAudio Member Join Date: Dec 2002 Location: dry ol Melbourne Australia	Is 3 w enough - how many dB are your Fostex ?

9th February 2006, 10:13 PM	#4
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	A popular choice- JE Labs 2A3 in two flavors. One is at www.angela.com site.

10th February 2006, 03:23 AM	#6
Geek diyAudio Member Join Date: Sep 2004	Cheap, simple, parts are easily obtained. Go nuts.

10th February 2006, 04:27 AM	#7
andrei diyAudio Member Join Date: Dec 2002 Location: Canada	Or you could do a single-bottle amp around 6DN7...

10th February 2006, 03:09 PM	#8
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	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

22nd February 2006, 11:07 AM	#9
tta60 diyAudio Member Join Date: Jan 2006 Location: Hanoi	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

22nd February 2006, 11:11 AM	#10
tta60 diyAudio Member Join Date: Jan 2006 Location: Hanoi	Oh, sorry! I wanted to say that the amp should make the speakers sing. Nicely and safely! TTA