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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: power tranny question posted by Vinnie on April 4, 2007 at 17:52:24:
Vinnie, the transformer is likely to be capable of tremendous amounts of current. It should be more than adequate for powering a pair of 845 SE, or even a pair of parallel push-pull 845. It has been suggested that you measure the resistance of the windings. I'll repeat that suggestion.Concerning the question of how you can get over 1000V DC from it: traditional power supplies for tube equipment use a center tapped transformer for the simple reason that the AC can be rectified with just two diodes. Both diodes might be contained in a single tube rectifier...
With a center tapped transformer and two diodes configured as a full wave center tapped (FWCT) rectifier, the effective AC voltage that gets rectified is that between the center tap and either end. In your case that would be 425 volts. With the 1500VCT transformer that Grover specifies it would be 750 volts.
However, if you use four diodes (tube or SS) connected as a full wave bridge (FWB) rectifier then you can use the entire 850 volts present across the whole secondary (taps 5 & 7.) The center tap (tap 6) would be left unconnected. That's actually 100 volts more than what Grover specs.
Fundamentally, tube rectifiers and SS rectifiers perform the same basic function. You might choose to use either or even a combination of the two. The high voltage that we are talking about here limits your choices of tube rectifiers; most of the types used in more common tube amps will not survive.
There are diagrams of both FWCT and FWB rectifiers on Wikipedia.
-- Dave
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Follow Ups
- Re: power tranny question - Dave Cigna 16:17:16 04/05/07 (3)
- Re: power tranny question - Vinnie 17:57:32 04/05/07 (2)
- Re: power tranny question - Dave Cigna 05:07:18 04/07/07 (1)
- Re: power tranny question - dave slagle 06:12:13 04/07/07 (0)
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