Radio Road

Which tuner to get and getting the most from it. Thank God, for the radio!

Return to Radio Road

Message Sort: Post Order or Asylum Reverse Threaded

FM3 diodes

Posted on April 17, 2023 at 16:13:44
Posts: 2
Location: HAWAII
Joined: April 17, 2023
Hi. I was starting to modify/upgrade an FM3 when I had to move. After several months of settling in to the new place I started unpacking the electronic stuff. I found all the upgrade pieces for the FM3 except the four diodes (D71-D74). FM3Zone has not responded to my messages so I am trying to find them elsewhere.
Does anyone have these diodes or at least the specs so I can order them from Digi-Key? Any help would be greatly appreciated.

Dan Bal


Hide full thread outline!
RE: FM3 diodes, posted on April 17, 2023 at 16:28:27

Posts: 9627
Location: NJ
Joined: December 11, 2000
I hope you find some but did you look under the flaps at the bottom of the box?


RE: FM3 diodes, posted on April 17, 2023 at 18:28:51
Steve O

Posts: 12200
Location: SE MI
Joined: September 6, 2001
Don't know what diodes were spec'd in the FM3Zone kit. I've successfully used 1N5711 in that app. 1N5711 is a 70V / 15mA Schottky device so forward drop is on order of 0.4 V or thereabouts and similar to germanium in that regard. They're in a leaded DO41 pkg so should drop in w/o mods. You could also try 1N34A. This is an old style germanium part that is no longer current but shows up occasionally at the usual antique radio parts sources like AES.


RE: FM3 diodes, posted on April 18, 2023 at 05:35:23
Posts: 2
Location: HAWAII
Joined: April 17, 2023
Steve O, thanks so much for the info. I have just ordered 10ea from Digi-Key.
It is the last thing left to do.


RE: FM3 diodes, posted on April 18, 2023 at 09:08:07

Posts: 411
Joined: June 23, 2004
Second the 1N5711's - has about the lowest forward voltage from silicon and is much more rugged


ESL Audio, posted on July 1, 2023 at 06:48:29

Posts: 4473
Location: SoCal
Joined: June 25, 2001
I got my PEC and Power Supply Kits from them. really nice. I don't know if they are still around, won't hurt to check. The PEC PCB kit raise the sonics on my FM-3. Then I did the other upgrades on the Audio Output section.


Page processed in 0.021 seconds.