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Sets, Parts and Service Information Wanted (private buyers only, no swaps) If you need help obtaining components, sets or equipment, post a message here. Private buyers only - no traders. No swaps.

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Old 21st Jan 2020, 11:42 am   #1
Boulevardier
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Default Matched pair AA112 germanium diodes

I'm looking for a matched pair of these gold-bonded, low Vr germanium diodes. The only supply I can find online is from the US, and cheap enough at $2, but the postage comes in at another $14!

Does anyone (in UK to keep postage down) have a pair of these (or very close equivalents) surplus to their needs that they'd be willing to sell?

Mike
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Old 21st Jan 2020, 12:21 pm   #2
paulsherwin
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Default Re: Matched pair AA112 germanium diodes

They were a standard European detector diode in the 60s and 70s, but are now rather rare. Littlediode have them for about 3 each including postage.

They are unlikely to be as critical as you think though. It sounds as if you need them for an FM ratio detector. A pair of 1N34As or 1N60Ps are likely to work just as well and can be bought from eBay sellers for next to nothing. You can hand select a pair for a close match, but two from the same batch are likely to have very similar characteristics anyway.

A scrap FM radio should also contain a pair of suitable diodes.
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Old 21st Jan 2020, 12:59 pm   #3
poppydog
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Default Re: Matched pair AA112 germanium diodes

Mike, I will have a look this evening.

poppydog
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Old 21st Jan 2020, 9:25 pm   #4
poppydog
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Default Re: Matched pair AA112 germanium diodes

Sorry Mike, I could only find 2 aa112 amongst all my diodes and they tested miles apart, I'm sure someone else will come up trumps for you.

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Old 23rd Jan 2020, 1:54 pm   #5
Diabolical Artificer
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Default Re: Matched pair AA112 germanium diodes

Could only find 1 AAZ15 & 1 AAZ17, sorry.

Andy.
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Old 23rd Jan 2020, 9:03 pm   #6
Boulevardier
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Default Re: Matched pair AA112 germanium diodes

Thanks anyway for looking, Andy. I am currently experimenting with some of The Schottky BAT41s I've got - not helped by the extreme difficulty of access to the IF board, which is perched horizontally close to surrounding components. So much physical stress from removal and insertion of components for testing that there's now a problem with those connector tracks joining the sub-board to the main board at right angles, at least one of which is giving intermittent contact. It's impossible to see tracks on the sub-board and the connections to the main board at the same time. So it's going to be time consuming and frustrating checking continuity. I will persevere cos it's a nice little radio!

Mike
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