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In Reply to: Re: Power Diode upgrades? posted by Bob G on January 9, 2007 at 09:44:08:
Thanks. I have gone to fmtunereinfo and they don't have specifics for thr TU-9900.I still have the question of how do I decide which shottkys to get. Which parameters or specs of the old one to I have to duplicate or exceed or not exceed?
Follow Ups:
I'm no electronic engineer, so I can't give you the exact way to determine what you need, but I've read that the voltage rating for Schottky's needs to be higher than for the original silicon diodes. In the tuners I've modified, I've used 85 volt/3 amp Schottky's that I picked up at my local electronics supply store, and I've used some 100 volt/5 amp ones that I got through DigiKey. I've also used the 5 amp Schottky's in vintage receivers with no problems, so you'd be totally safe with them in your tuner which doesn't draw nearly as much power.Again, I'm no expert, but I don't think the actual value you install makes a lot of difference (at least to the sound) as long as you get to, or beyond, that minimum value.
Maybe I've just been lucky, but I've installed Schottky's in almost all the solid state stuff I have using the above guide lines, and the results have always been good.
Schottky are the best if you can find them in the voltage/amp rating you need, they are harder to find in high voltage/amperage ratings. Hexfreds are next best and are more widely available in higher voltage/amp ratings. Ive used the IR 11DQ10 100v/1.1a in my Marantz cd63se uppgrades and they worked well.
If you have the real estate and the bucks, diodes can be paralleled for greater current and seriesed (ok, you make up a word for that) for greater voltage.
You're right about that. I've wanted to install Schottky's in my tube equipment but have found them very hard to find. Parts Connexion has some, but they're beyond my budget.
Only need to install ONE diode to get all the alleged benefits from the new and improved design. But then the Vendors don't tell you that, either from ignorance or greed... you decide which :-)
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