VERY old transistors for free!

TroelsM · 25th August 2007, 08:20 PM

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

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

Hi.

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

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

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... ?

25th August 2007, 08:20 PM	#1
TroelsM diyAudio Member Join Date: May 2003 Location: AARHUS. DK	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 __________________ Need more time...

25th August 2007, 08:53 PM	#2
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	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. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

26th August 2007, 12:04 AM	#8
OzMikeH diyAudio Member Join Date: Mar 2007	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. __________________ Help some guys with funny hair bang two rocks together really hard. http://athome.web.cern.ch/athome/LHCathome/whatis.html

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25th August 2007, 09:25 PM	#3
Nordic diyAudio Member Join Date: Sep 2005	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...

25th August 2007, 11:18 PM	#5
davidallancole diyAudio Member Join Date: Nov 2005	The AC128 was used in the fuzz face effects pedal for the guitar. I would take those of your hand.

25th August 2007, 11:29 PM	#6
bob_v5 diyAudio Member Join Date: Sep 2005	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.......)

25th August 2007, 11:32 PM	#7
davidallancole diyAudio Member Join Date: Nov 2005	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.

26th August 2007, 08:22 AM	#10
Nordic diyAudio Member Join Date: Sep 2005	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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