5U4 Darling power TX advice needed - diyAudio
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Old 13th December 2008, 03:44 PM   #1
waam68 is offline waam68  United Kingdom
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Join Date: Apr 2007
Default 5U4 Darling power TX advice needed

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:


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!
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Old 14th December 2008, 03:43 PM   #2
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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)

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Old 14th December 2008, 07:15 PM   #3
Klimon is offline Klimon  Belgium
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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

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