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Proud Mary

Tue Sept 07 2010, 03:50PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Oidium45 wrote ...

PROUD MARY- maybe you could shoot some ideas my way?

You can download a 1966 radio amateur article on how to test 1966 semiconductors with a basic ohm meter here:

radiotech

Wed Sept 08 2010, 12:53AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

Steve McConner wrote: And most of them aren't even good for that as they have too high leakage.

Industry Number : CK722
NTE Device Number: NTE102
T-PNP,GERMANIUM AF PREAMP,DRIVER,TO-5

(drawn from this NTE QUICKCROSS 2010 Version 15.0-- Free download fron NTE

Of course you could buy a new one from NTE.

Adam Munich

Wed Sept 08 2010, 01:34AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

I just wanted some data on them. I'd like to build a model amplifier using all 1960's components. (brown tube resistors, funny looking diodes etc.) It doesn't have to sound any good, just work.

radiotech

Wed Sept 08 2010, 02:50AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

Here is a very smart little tester. Micronta Dynamic Transistor
Tester, Its a oscillator with an iron core transformer connected to a red LED with a adjustment pot to find the sweet zone for bias where it starts oscillating and the light comes on. If the transistor can oscillate-it can amplfiy- its good for something.

Additionally two pin jacks to connect to external amplifier to hear is oscilate or scope it. Lazy types can just lay the tester on a transistor radio and here it make a tone.

In the electronics intro class we lit matches under can type germanium transistor to hear them scream as they twinked out. And as they cooled down they started to work again until most of the tone returned. Most of the time. We had a hugh box of germanium pulls from old digital computer boards with socketed transistors.

Beat the boredom of slogging through bias stability calcs.

The views are of an original era Raytheon CK760 note the LED on.

1283914217 2463 FT92986 Transistortester

Matt Edwards

Wed Sept 08 2010, 03:59AM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

Grenadier wrote ...

I just wanted some data on them. I'd like to build a model amplifier using all 1960's components. (brown tube resistors, funny looking diodes etc.) It doesn't have to sound any good, just work.

I have several bags of these resistors (NOS) laying around. If you need a a few particular values give me a pm. Just have to promise to show off the results when you get dome building the thing.

Adam Munich

Wed Sept 08 2010, 04:15AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

I have plenty, but first I have to find the ratings on these things!

What I've always REALLY wanted to do is make an all-glass circuit, using glass resistors, glass vacuum caps, glass vacuum tubes, and glass diodes. But there's no way I'd find the parts with the right values to make an amp.

I've also always wanted to build a 555 timer from scratch. Never got around to it. BTW, anyone have any metal 555 timers?

Sorry to hijack the thread, but I'm still looking for the data on these. Anyone got an old copy of the general electric transistor manual?

Matt Edwards

Wed Sept 08 2010, 02:31PM

Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333

Try contacting GE. I have had good luck in the past. Just be polite and you may be able to get someone nice on the line.

Adam Munich

Fri Sept 10 2010, 03:38AM

Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242

Well I tested the Hfe, and here's what I got.

The PT2 and GE1 are both NPN, and the GE4 is PNP.

PT2 has a Hfe of 130
GE1 has a Hfe of 50
GE4 has a Hfe of 100

I still don't know the maximum ratings though.

pauleddy

Mon Oct 11 2010, 11:18PM

Registered Member #2909 Joined: Wed Jun 09 2010, 12:31AM
Location: fort belvoir, Va USA ( south of DC)
Posts: 145

i have found a few of these parts in a 28v 200a dc power supply
i think its some form of filter????
i put up pics shorty but this is all i have found

does any one know of any good uses for these?

Mads Barnkob

Wed Nov 24 2010, 10:59AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

I forgot where I got these from, text says "W47 +-5%, 500V EM"

They measure 53 - 55 nF so they are capacitors within their written rating, but what types are they? I have had no luck finding these on google.

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