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Old 25th August 2007, 09:20 PM   #1
TroelsM is offline TroelsM  Denmark
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Default 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

BCY34

OC71.

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
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Old 25th August 2007, 09:53 PM   #2
EC8010 is offline EC8010  United Kingdom
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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.
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Old 25th August 2007, 10:25 PM   #3
Nordic is offline Nordic  South Africa
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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...
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Old 25th August 2007, 11:32 PM   #4
TroelsM is offline TroelsM  Denmark
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Default Update

Hi.

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

Regards TroelsM
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Old 26th August 2007, 12:18 AM   #5
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The AC128 was used in the fuzz face effects pedal for the guitar. I would take those of your hand.
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Old 26th August 2007, 12:29 AM   #6
bob_v5 is offline bob_v5  England
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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.......)
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Old 26th August 2007, 12:32 AM   #7
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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.
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Old 26th August 2007, 01:04 AM   #8
OzMikeH is offline OzMikeH  Australia
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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.
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Old 26th August 2007, 07:47 AM   #9
poynton is offline poynton  United Kingdom
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Default Re: Update

Quote:
Originally posted by TroelsM
Hi.

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

Regards TroelsM

it's a Mullard early package design.


http://homepages.nildram.co.uk/~wyli...rd/Mullard.htm


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


Andy
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Old 26th August 2007, 09:22 AM   #10
Nordic is offline Nordic  South Africa
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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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