5U4 Darling power TX advice needed

waam68 · 13th December 2008, 03:44 PM

Hi
I just picked up four NOS 1626's dated 1942 for peanuts & as my vintage speakers run very loud with a 3W 6B4G amp I'm considering having a go at a <1W Darling as my first point to point build using this schematic:

http://www.audiohobbyist.com/images/...16265u4sch.jpg

I'm planning to use the small 5K 15ohm Edcor OPTX I have left over from another project & a NOS svetlana 5U4 from the junkbox. Ideally I would like to recycle an Edcor Power tx I have spare...it's an XPWR106-240 550V 125mA Center Tapped (2* 275v and a CT) & 6.3V 4A. The schematic calls for 240v ...is this power tx any use for this project, I know I would need a separate heater transformer. I am slowly learning but my first 2 amps (which amazingly work well) were both built off PCB's & had manuals!
Mike

Elektor78 · 14th December 2008, 03:43 PM

would it be better decoupling the supply ? (of first tiode)
as this : http://www.drtube.com/schematics/fen...-5c1-schem.gif
(anodic current of 6SJ7 are filtered by 8uF Cap. and 25K resistor)

bye

Klimon · 14th December 2008, 07:15 PM

Take a look at the DC Darling amp; the dedicated power supply uses a transformer with the same specs as yours. http://www.geocities.com/TimesSquare/1965/darling.html

You'll like the sound of those little buggers

Simon

13th December 2008, 03:44 PM	#1
waam68 diyAudio Member Join Date: Apr 2007	5U4 Darling power TX advice needed Hi I just picked up four NOS 1626's dated 1942 for peanuts & as my vintage speakers run very loud with a 3W 6B4G amp I'm considering having a go at a <1W Darling as my first point to point build using this schematic: http://www.audiohobbyist.com/images/...16265u4sch.jpg I'm planning to use the small 5K 15ohm Edcor OPTX I have left over from another project & a NOS svetlana 5U4 from the junkbox. Ideally I would like to recycle an Edcor Power tx I have spare...it's an XPWR106-240 550V 125mA Center Tapped (2* 275v and a CT) & 6.3V 4A. The schematic calls for 240v ...is this power tx any use for this project, I know I would need a separate heater transformer. I am slowly learning but my first 2 amps (which amazingly work well) were both built off PCB's & had manuals! Mike

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14th December 2008, 03:43 PM	#2
Elektor78 diyAudio Member Join Date: Jul 2008	would it be better decoupling the supply ? (of first tiode) as this : http://www.drtube.com/schematics/fen...-5c1-schem.gif (anodic current of 6SJ7 are filtered by 8uF Cap. and 25K resistor) bye

14th December 2008, 07:15 PM	#3
Klimon diyAudio Member Join Date: Apr 2005 Location: Leuven	Take a look at the DC Darling amp; the dedicated power supply uses a transformer with the same specs as yours. http://www.geocities.com/TimesSquare/1965/darling.html You'll like the sound of those little buggers Simon

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