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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: Gotta replace my tube rectifier with a SS rectifier, what are the best choices? posted by drummerwill on January 29, 2007 at 06:19:15:
Will,I hope your experiments with ferrous metal shielding bear fruit. However, you should have a SS fallback position, should shielding fail to get the job done.
CL150 inrush current limiters will slow the B+ down ENOUGH, as you are using DHT "finals".
A slightly unusual topology will minimize the amount of heat generated in a dropping resistor. Connect each end of the rectifier winding to the cathode of a UF5408 via CL150 inrush current limiter. Connect both UF5408 anodes to ground. Connect the CT of the rectifier winding to an end of the 5 VAC rectifier filament winding. Connect the other end of the 5 VAC winding to the anode of a 1200 PIV Schottky diode. Of the 2 possible arrangements of the 5 VAC winding, 1 will lower the net B+, while the 2nd will raise the net B+. You will have to determine the lower voltage arrangement at the bench and use it. The cathode of the Schottky diode feeds the PSU filter network. Like a vacuum diode, a Schottky diode is free of switching noise and it will also block PN junction diode noise. Ferrite beads on the filament power leads will kill any UF5408 generated noise that sneaks into the power trafo.
Eli D.
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- Re: Gotta replace my tube rectifier with a SS rectifier, what are the best choices? - Eli Duttman 16:44:33 01/29/07 (0)
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