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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: I realize specs aren't everything... posted by Eli Duttman on March 25, 2015 at 14:14:27:
Two negative rails are needed: the 1st is "short"/instant on (for bias/C-) and the 2nd is "taller"/slow starting (for LTP power/B-).
Start with an AnTek AN-0240 power trafo.
Phase the 2X 40 VAC windings up and connect them in series. Hybrid bridge rectify the composite using a MBR20200CT common cathode twin Schottky diode as the connection to ground and a 6AL5 forming the connection to the B- supply filter. This bridge is like that in the original "El Cheapo", but the rail voltage is a bit lower (NBD).
Connect the cathode of a MBR1100G Schottky diode to the junction of the 40 VAC windings. Connect the anode of the MBR1100G to the C- supply filter.
Both rails are full wave rectified, with the MBR20200CT providing the path to ground. The "tall" rail is bridge rectified and the "short" rail is FWCT rectified. Zero switching noise too. ;>)
Thank Pete Millett for the 2 rails from 1 CT winding concept.
Eli D.
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Follow Ups
- Negative Rails - Eli Duttman 17:44:18 03/25/15 (1)
- RE: Negative Rails - Triode_Kingdom 16:52:25 03/27/15 (0)
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