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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: Which PS would you rather listen to? posted by th on May 8, 2007 at 00:01:33:
...add a resistor ACROSS the secondary winding of the traffo (before any diodes) so it's current isn't completely cut off when the diodes go into their "dead band" near zero crossing. It's the sudden change from some current to no current that creates the voltage spike. It helps on both cap and choke input supplies.I size this R by looking at an unconnected low voltage winding (heaters etc) on the same traffo with the delayed sweep on the scope, and decrease the R untill the switch-on and switch-off spike is vanished, or at least majorly reduced and turned into a soft ripple rather than a spike.
Sure this R uses some power - but with your wall of rectifier tubes I think you wouldn'd notice the extra heat!
Regards, Allen
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Follow Ups
- Thomas, all good points. Another trick is to... - Allen Wright 01:22:23 05/08/07 (4)
- I use this trick and it works well. - Stephen R 00:41:24 05/09/07 (0)
- Hmmmm... got me thinking - Mike Spence 15:14:45 05/08/07 (0)
- Re: Thomas, all good points. Another trick is to... - gfederys 12:13:21 05/08/07 (0)
- Re: Thomas, all good points. Another trick is to... - Thomas Mayer 01:27:10 05/08/07 (0)
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