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Old 20th December 2013, 07:35 PM   #1
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Default Transformer Windfall. Now what?

I came home this afternoon, expecting to find my 18V 10VA toroidal in the mailbox. And I did, or so I thought. I was a bit surprised by the weight of the box, but went inside to open it without thinking twice. Upon opening the shipment, I found a 20V 25VA toroid AND a 50VA toroid with 120V (100V tap) secondary and dual 6.3V secondaries.

Woot!

The 20V transformer will work just fine for my 18V regulated PSU project and now I've got the beginnings of a new...uh...something!

Anyone have any designs that can make use of this extra transformer? The heater secondaries are both rated at 2A and the 120V secondary (w 100V tap) is rated for 250mA. 150V B+ or 250V B+ with a voltage doubler?

I could use a tube buffer for my Tubelab SSE maybe. Tube phono-pre? Headphone amp? Who's got a good low-ish voltage tube design?




PS I did contact the manufacturer to let them know of the mix-up and expressed my satisfaction with the shipment even though it obviously wasn't my order. We'll see if they want me to send anything back.
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Old 20th December 2013, 08:04 PM   #2
lexx21 is offline lexx21  United States
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The #26 tube preamp uses pretty low voltage.
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Old 20th December 2013, 08:11 PM   #3
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Thanks, Lex. I'll check that out.

Currently also looking through 6Y6 schematics. I've got the beginnings of an audio boner...
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Old 20th December 2013, 08:47 PM   #4
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Erm, that #26 tube preamp thread is a hot mess. Anyone happen to know where I can find a proven schematic?
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Old 20th December 2013, 09:24 PM   #5
lexx21 is offline lexx21  United States
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LOL.... yes it is my friend... yes it is.....LOL.

That is one huge thread, but the benefit is that you see what people have tried, operating points, what worked, what didn't.... etc.

There is also some stuff on the Bartola Valves site where he uses a 26. He has several modifications that he has done to it.
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Old 20th December 2013, 10:22 PM   #6
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Ah, the Bartola Valves site is a little easier to digest. I've never played with DHT's, so this is interesting. Thanks!

In case anyone else is reading:

http://www.bartola.co.uk/valves/dht-...mplifier-gen2/
http://www.bartola.co.uk/valves/dht-...mplifier-gen3/

Last edited by Sodacose; 20th December 2013 at 10:24 PM.
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Old 24th December 2013, 01:11 PM   #7
lhgin is offline lhgin  Malaysia
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I would check out VT52.com. Pretty interesting stuff there, and proven to work. I've tried a few of his design.
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Old 24th December 2013, 02:08 PM   #8
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Something with EL86 (OR PL84) output tubes might work.
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Old 24th December 2013, 02:26 PM   #9
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Spending a lot of time reading on the forum and elsewhere, I think I've found somewhere to take this 'freebie'.

I think I'll use the 120V and one of the 6.3V secondaries to power an Aikido cathode follower (perhaps 6DJ8's @75-80V each or another valve with a voltage doubler).

If this works out, I may use the other 6.3V heater tap for a 12-24V supply to power a T-Amp, DAC, phono-pre or something.
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Old 24th December 2013, 02:31 PM   #10
Ketje is offline Ketje  Belgium
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A small stereo amp is a possebility.If you put in the voltagedoubler to replace the bridge rec. with an extra RC supplyfilter,less hum,somewhat lower voltage,than this one can be used.
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