Vintage Asylum

RE: Well, I own a Dynaco SCA-35 ...

12.10.199.10

Eli Duttman

A

In Reply to: RE: Well, I own a Dynaco SCA-35 ... posted by Audio Mind on February 19, 2015 at 11:33:24

UF4007s are MUCH quieter than earlier PN junction types. They are rated 1000 PIV/1 A. and come in the convenient DO41 axial lead package. The UF4007 is a low cost, drop in, replacement for the very noisy 1N4007.

If "zero" switching noise is what you're looking for, Cree makes silicon carbide (SiC) Schottky diodes that are up to 1200 PIV. These parts come in TO220 packages and may be mechanically problematic in a retrofit situation.

Eli D.

Follow Ups:

Yea buddy! - Crazy Dave 08:52:30 02/20/15 (0)
And Asylum Sponsor Uncle Ned makes a nice revised board with easy to find tubes.

Dave
RE: Well, I own a Dynaco SCA-35 ... - Audio Mind 12:25:19 02/19/15 (3)
A Schottky diode with 1200v piv !!!....cool wow I have been out of it for too long, the last time I checked they were like 100 or 200 volts. Been away from the latest tech for too long I guess...Thank you very much for the heads up.

I bet they are not too far off in sound form tube rectifiers as earlier diodes like painful sounding IN4007's. At least they are painful to my ear.
- RE: Well, I own a Dynaco SCA-35 ... - Michael Samra 21:52:21 02/19/15 (0)
  I bet they are not too far off in sound form tube rectifiers as earlier diodes like painful sounding IN4007's. At least they are painful to my ear.
  
  You are 100% spot on..They are so quiet and so linear and they don't sag.
  The Schottkys have been an absolute blessing.If people are smart,amps like the Dynaco ST70 should have the GZ34 removed and they should put in Schottkys. This will not only park the 5 volt winding and save stress on the power trans,they amp will run cooler and give you higher power and lower distortion..The GZ34 is pretty close to it's 250ma limit in the ST70 especially if you are running a three tube driver board.
  "If it measures good and sounds bad, it is bad; if it measures bad and sounds good, you have measured the wrong thing."
  
  - Daniel R. von Recklinghausen
- RE: "A Schottky diode with 1200v piv !!!" - 1973shovel 18:43:26 02/19/15 (1)
  Yep, here you go...Link below.
  - Cree at Mouser (Open in New Window)
  - RE: "A Schottky diode with 1200v piv !!!" - Audio Mind 22:08:50 02/19/15 (0)
    Thanks a million! I am eager to try them.

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