Hi
Im looking at a tube buffer using the 12AU7 and EZ81 rectifier. The schematic calls for a Allied Electronic 6k88vg (250-0-250. @40ma; 6.3v @2a). Locally (Australia) the cheapest I can find is a Hammond at $120. Heater transformers are cheap but I can't find a 500vct.
I recall reading somewhere that guitar amp guys were reversing wall wart transformers and connecting primaries of one to the secondaries of another to achieve various HV supplies.
Would this be possible, if so what is the equation?
Any other suggestions more affordable?
Our mains is ~240v
Im looking at a tube buffer using the 12AU7 and EZ81 rectifier. The schematic calls for a Allied Electronic 6k88vg (250-0-250. @40ma; 6.3v @2a). Locally (Australia) the cheapest I can find is a Hammond at $120. Heater transformers are cheap but I can't find a 500vct.
I recall reading somewhere that guitar amp guys were reversing wall wart transformers and connecting primaries of one to the secondaries of another to achieve various HV supplies.
Would this be possible, if so what is the equation?
Any other suggestions more affordable?
Our mains is ~240v
With no low-price CT transformers, the wisest path is to drop the vacuum rectifier and run 240VAC (from a transformer(s)!) to a full wave bridge of 1N4007 Silicon diodes.
Yes, 240V:6V then (backwards)6V:240V gets you there. The first one should be at least 10VA.
Yes, 240V:6V then (backwards)6V:240V gets you there. The first one should be at least 10VA.
Hi
Antek has what you need.
There in USA, but it's cheap.
AS-1T250 - 100VA 250V Transformer - AnTek Products Corp
Antek has what you need.
There in USA, but it's cheap.
AS-1T250 - 100VA 250V Transformer - AnTek Products Corp
As PRR said, use the 6V between transformers to feed the filament.
Other option is to get an toroidal isolation transformer (240 to 240VAC in your case), use the full wave bridge, and add a 6.3V winding to it. On the transformer I worked with this always turned to be around 35-40 windings. Here is an example:
https://www.diyaudio.com/forums/tub...ry-5-secondary-antek-2t350-3.html#post2354966
Other option is to get an toroidal isolation transformer (240 to 240VAC in your case), use the full wave bridge, and add a 6.3V winding to it. On the transformer I worked with this always turned to be around 35-40 windings. Here is an example:
https://www.diyaudio.com/forums/tub...ry-5-secondary-antek-2t350-3.html#post2354966
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