VERY old transistors for free! - Page 2

TroelsM · 26th August 2007, 11:06 AM

OK, dug up some more.

This time it's resistors.

All brand new.

What are these? Are they any good?

I have 10-20 different values

Regards TroelsM

anatech · 26th August 2007, 09:16 PM

Hi TroelsM,
Yes, those resistors are good. They appear to be wire wound.

-Chris

TroelsM · 26th August 2007, 09:24 PM

Hi Chris.

Good for what? I'm just curious as they seem to be a lot bigger than modern types.

Regards

anatech · 26th August 2007, 09:32 PM

Hi TroelsM,
They are power resistors and are good for much more than 1/2 watt like the average part. I would hang on to them and use them when you need that value at higher power.

-Chris

john_ellis · 26th August 2007, 09:46 PM

Hi TroelsM

Those AC176's might be valuable!
Back in the days of geraniums (sweet scented...) the AC128 was pretty much an OC81 update. The transistor sold as its complement was an AC127. It wasn't. If you ever tried to design a complementary 9V tranny radio output stage the gain fall-off of an AC127 was pretty poor, and you had to push the driver current somewhat to guarantee it would work. The AC176 was a "true" complement to the AC128 and you could successfully design the proverbial 1W amp. with it.

You have to go some to make a silicon tranny amp work like the AC176/AC128 pair. It is possible, but you need something special. For example, a BC327/BC337 pair CAN do 1W but run out of steam (a bit like the AC127) but a double pair of BC327/337 will do 1W. But then you've got the Vbe to limit performance unless you use a bootstrap on both sides; then the gain is still a little low.

But there again who uses 9V tranny radios these days with 1W/channel?

cheers
John

anatech · 26th August 2007, 10:33 PM

Hi John,

Quote:

But there again who uses 9V tranny radios these days with 1W/channel?

Headphone amp.

A 1W transistor radio would have been quite the performer! Most were a couple hundred mW, "back in the day".

-Chris

SY · 26th August 2007, 11:30 PM

Well, thanks for making me feel like a senior citizen. One of my first electronic kits was one of those 26-in-1 setups with a breadboard from Philips- got it for my 11th birthday. AC126 and AF116. I had just built a little preamp with CK722 and was intrigued by these European units. Nice find!

mod_evil · 27th August 2007, 12:40 AM

Hey

If you can send to me some AC128 to make a FUZZ FACE PEDAL, i will be very happy!

My email: Felnavarro@gmail.com

Best Regards,
Felipe

valvusmusicus · 24th May 2008, 08:13 PM

Hi
I build Guitar Pedals and have a use for all (well most anyway) of these. I would be prepared to make adonation or pay what you want for them. If you have any left, that is

Cheers
paul

unclejed613 · 25th May 2008, 05:07 PM

those Mot transistors can find use in old car radios or old Leslie amps. you might want to find a pro-audio shop that refurbs old organs like Hammonds. those transistors (large and small) would be quite useful to them.

26th August 2007, 09:16 PM	#12
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi TroelsM, Yes, those resistors are good. They appear to be wire wound. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

26th August 2007, 09:24 PM	#13
TroelsM diyAudio Member Join Date: May 2003 Location: AARHUS. DK	Hi Chris. Good for what? I'm just curious as they seem to be a lot bigger than modern types. Regards __________________ Need more time...

26th August 2007, 09:32 PM	#14
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi TroelsM, They are power resistors and are good for much more than 1/2 watt like the average part. I would hang on to them and use them when you need that value at higher power. -Chris __________________ "Just because you can, doesn't mean you should" © my Wife

26th August 2007, 11:30 PM	#17
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	Well, thanks for making me feel like a senior citizen. One of my first electronic kits was one of those 26-in-1 setups with a breadboard from Philips- got it for my 11th birthday. AC126 and AF116. I had just built a little preamp with CK722 and was intrigued by these European units. Nice find! __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

27th August 2007, 12:40 AM	#18
mod_evil diyAudio Member Join Date: Dec 2004 Location: Rio	Hey If you can send to me some AC128 to make a FUZZ FACE PEDAL, i will be very happy! My email: Felnavarro@gmail.com Best Regards, Felipe __________________ Brazilian Tube Amp Builder.


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26th August 2007, 09:46 PM	#15
john_ellis diyAudio Member Join Date: Sep 2006	Hi TroelsM Those AC176's might be valuable! Back in the days of geraniums (sweet scented...) the AC128 was pretty much an OC81 update. The transistor sold as its complement was an AC127. It wasn't. If you ever tried to design a complementary 9V tranny radio output stage the gain fall-off of an AC127 was pretty poor, and you had to push the driver current somewhat to guarantee it would work. The AC176 was a "true" complement to the AC128 and you could successfully design the proverbial 1W amp. with it. You have to go some to make a silicon tranny amp work like the AC176/AC128 pair. It is possible, but you need something special. For example, a BC327/BC337 pair CAN do 1W but run out of steam (a bit like the AC127) but a double pair of BC327/337 will do 1W. But then you've got the Vbe to limit performance unless you use a bootstrap on both sides; then the gain is still a little low. But there again who uses 9V tranny radios these days with 1W/channel? cheers John

24th May 2008, 08:13 PM	#19
valvusmusicus diyAudio Member Join Date: Apr 2007	Excellent, I have a use for them Hi I build Guitar Pedals and have a use for all (well most anyway) of these. I would be prepared to make adonation or pay what you want for them. If you have any left, that is Cheers paul

25th May 2008, 05:07 PM	#20
unclejed613 diyAudio Member Join Date: Dec 2006	those Mot transistors can find use in old car radios or old Leslie amps. you might want to find a pro-audio shop that refurbs old organs like Hammonds. those transistors (large and small) would be quite useful to them. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: http://www1284177414881.v-dc.net/

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