2220B H216 Diode?

[milo63]

Working on a troubled 2220B, someone has spilled some liquid on to the P100 board and it corroded a bunch of component leads.

H216 is a 20A 90M diode and nobody has seemed to have had to replace one per the search function.

 

[avionic]

H216 is a 20A 90M diode

The one in the photo looks germanium to me.

 

[milo63]

The one in the photo looks germanium to me.

Thank you.
I forgot that our own overachiever @Steven Tate (thank you Steven!) made a massive PDF of Marantz subs and called it a 1N60 Germanium.



Looks like a BAT43 Schottky is the sub.

 

[rBuckner]

Weird how they numbered it, I was thinking the original is an OA90, no "2" in front. I bet the 1N60 works fine.

 

[bill_p]

The "2" indicates a matched pair. H215 and H216 are matched and used in the ratio detector. Mismatched diodes may increase detector distortion. Schottky diodes may not work well as substitutes.

 

[milo63]

The "2" indicates a matched pair. H215 and H216 are matched and used in the ratio detector. Mismatched diodes may increase detector distortion. Schottky diodes may not work well as substitutes.

Great....how does one match germanium diodes if one can find real germanium diodes?

Thanks for clarifying and reminding me that I hate tuners.

 

[ocdecio]

Great....how does one match germanium diodes if one can find real germanium diodes?

Thanks for clarifying and reminding me that I hate tuners.

I would buy any P200 you can find and scavenge 1N60s from there.

 

[milo63]

I would buy any P200 you can find and scavenge 1N60s from there.

That's where I'm at, I dug through my box of boards with no luck.

 

[rcs16]

"Great....how does one match germanium diodes if one can find real germanium diodes?"
Use your DMM in diode test mode, lead clipping probes. Match for the same or very close to the same readings.

 

[Bill Ferris]

I would buy any P200 you can find and scavenge 1N60s from there.

FWIW, I seem to remember from many yrs. ago that 1N34(A) is a Germanium small signal diode that was commonly used as modulation detectors in both AM & FM receivers.

Just a suggestive thought.

 

[milo63]

"Great....how does one match germanium diodes if one can find real germanium diodes?"
Use your DMM in diode test mode, lead clipping probes. Match for the same or very close to the same readings.

Thank you.
I bought the cheapest P100 board (2270) on eBay to cannibalize the 1N60 diodes from, it has a bunch so I should be set for life

 

[rcs16]

Very good, best way to get original parts is from doners.
Test them anyways, see how close they match