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TroelsM 25th August 2007 08:20 PM

VERY old transistors for free!
Hi all.

I've been given a number of old (germanium-transistors).

Half of them have never been used and I would guess that they are in good condition.

I have no use for them, but there seems to be some hype about these and I would like to offer them to you guys.

Types are (amongst others)

AC176, AC128, AC125



I guess that there are around 30 in all.

I can post pics (germanium-porn?)

Some one has obviously taken great care of these for many years and I would like to "honor" this by giving them to people at DiyAudio.

If the transistors are worth anything I would like people to donate some money to DIYA and I'll send the transistors for free.

So, post here if you feel that you have a "worthy" project.

If I dig more stuff up, I'll post it here.

Regards TroelsM

EC8010 25th August 2007 08:53 PM

I'd be interested to measure them. However, they may not work. I tried measuring a GET1 recently but when I opened the sealed packaging, it turned out not to work. Poor seals on the transistor had allowed water vapour in and killed it. Shame.

Nordic 25th August 2007 09:25 PM

I still have 1 a128 somewhere.. its mate is dead... realy old.... I remember it being in my dad's drawer when I was just a kid still...

TroelsM 25th August 2007 10:32 PM

2 Attachment(s)

I also found these. - I've never seen anything like them before.

Regards TroelsM

davidallancole 25th August 2007 11:18 PM

The AC128 was used in the fuzz face effects pedal for the guitar. I would take those of your hand.

bob_v5 25th August 2007 11:29 PM

Just wondering, are these any better than sillicon transistors, and if they are why does no one use them anymore? ( ha this is where i get a hundred people saying they use them.......)

davidallancole 25th August 2007 11:32 PM

They are better in some respects like a lower base to emitter voltage, around 0.3V, but are worse in others like higher leakage currents.

OzMikeH 26th August 2007 12:04 AM

I used to use an AWA regulated power supply with 2n442s in it ( my memory may be failing me but they were something like that). The thing was built mostly point-to point, the whole thing was made like they were expecting valves to go in it. Was still running beautifully when I left the company 3 years ago.

4 of them were good for 10 amps at 13.8V. they might be good for a little retro class A amplifier.

poynton 26th August 2007 06:47 AM

Re: Update

Originally posted by TroelsM

I also found these. - I've never seen anything like them before.

Regards TroelsM

it's a Mullard early package design.

EDIT :- No it's Motorola !!!!


Nordic 26th August 2007 08:22 AM

I was thinking in bed last night.. I would like to try a headphone amp with germaniums... Can I maybe buy one or two of those A128's from you... ?

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