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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: Gotta replace my tube rectifier with a SS rectifier, what are the best choices? posted by drummerwill on January 28, 2007 at 14:48:06:
you could very well (probably will)open a whole new can of worms by
going to SS rectifiers. The switch-on surge (unless you have
a quite effectively designed soft-start circuit installed) will
absolutely be hard on your tubes and capacitors --likely greatly
shortening the life of your 300B's, if not others.
Also you will have higher HV voltage due to much less drop through
the SS diodes which you will have to compensate with an aditional
large dropping resistor. The sound of the amp will be changed too,
quite possibly for the worse. Be sure and use a 'soft-recovery'
type of diode if you MUST try this, and be prepared for possible
additional noise in the supply chain from any SS diodes.Personally, I have this feeling the tube rectifier may not be the
source of your problem. If you cover your TWISTED pair of 5v lines
supplying your rectifier filament with metallic braid shielding
which is insulated from the chassis by heat-shrink tubing and
grounded to the chassis (the metallic shield, that is) at ONLY
ONE END near the power transformer --then you could just about
eliminate the rectifier as the culprit. It really sounds like
you may have power transformer or choke (how near are they to
the input stage?) induction hum, or just as likely a ground loop
issue causing this.In short: I'd fiddle around quite a bit before thinking about
resorting to tube rectifier removal.Good luck,
-T.M.
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Follow Ups
- I suggest keeping Tube rectification, trying other things first.... - Thomas Martens 14:30:42 01/29/07 (2)
- Thanks Tom....... - drummerwill 06:25:32 01/31/07 (1)
- Re: Thanks Tom....... - Eli Duttman 17:11:18 01/31/07 (0)
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