Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

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astradyne
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Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by astradyne » 08 Jun 2018, 11:27

Hi guys.

I found this excellent little video on YouTube. If you're unsure about testing your 1969 transistors for faults then this is the perfect video for you. It's short, informative, easy to follow and directly to the point. No bells or whistles or someone rambling on. It's a matter of fact clip which anyone can follow. This guide will also work with any other NPN transistor such as the 2sc2166 and 2sc2312.

https://youtu.be/xo6PvI1sXyg
Never, ever, ever....bloody anything ever!

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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by ghost123uk » 08 Jun 2018, 13:48

The trouble with all this is how do you tell in advance if you are buying a genuine article or a Chinese fake?
Many UK wholesalers are actually just outlets based in the UK, selling the usual Chinese rubbish.
It's getting really hard to ensure you are getting a proper product.
I don't know what can be done about it, but sadly China is flooding the world with cheap tat and fake gear.
John, on the S. Cheshire / N. Shropshire border. Muppet handle "Grey ghost" and on UK C25 most working days.
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by cb4ever104 » 08 Jun 2018, 14:00

ghost123uk wrote:
08 Jun 2018, 13:48
The trouble with all this is how do you tell in advance if you are buying a genuine article or a Chinese fake?
Most of the time the fakes are pretty easy to spot . There's a good thread on here somewhere about it . A safe rule of thumb would be not to buy any from China at all . Most NOS ones tend to appear within Europe , and the States .

The only original 2312s I can see at the moment are these ones :
2312.jpg
Check the slight indentations on the main body . The legs should probably be a bit darkened over time . Check the size of the Mitsubishi symbol , plus the letters on it .

Sammy
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by ch25 » 08 Jun 2018, 16:43

That way you can check only if transistor is not defected.
In attachment is a circuit which will show you if transistor is legit or counterfeit. You go to the shop and you know before buy. Just put transistor to the socket and when led is lit, it is legit.
Kudos to sp8jux who invented that device.
tester rf.jpg
Chris
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by cb4ever104 » 08 Jun 2018, 17:27

ch25 wrote:
08 Jun 2018, 16:43
You go to the shop and you know before buy.
Nice little circuit there Chris . The only problem is . Who goes into a shop these days to buy 2166/1969 and 2312s ? They're not made any more . Anyway , it's a useful little tester regardless .

Sammy
Last edited by cb4ever104 on 09 Jun 2018, 10:44, edited 1 time in total.
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by ch25 » 08 Jun 2018, 18:00

I built that, because even 2078 are fake in local shops here. 1966 replacement is no problem to buy locally here. Eleflow HFR-20W 7 quid.
Online you can't go wrong with eleflow parts.
Chris
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by cb4ever104 » 08 Jun 2018, 20:28

ch25 wrote:
08 Jun 2018, 18:00
Online you can't go wrong with eleflow parts.
Chris
I agree . Saying that I've only had to ever buy 2 transistors from them . I haven't had that many radios with driver/final problems , so I don't have to replace them often . And on top of that I try and buy old scrap radios for parts when I can .
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Handle "Fortune Hunter" back in "the day"
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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by astradyne » 08 Jun 2018, 22:04

There are some NOS 1969's currently on eBay. £11 a piece with P&P, but they are from a trusted seller.

https://rover.ebay.com/rover/0/0/0?mpre ... 3007169746
Never, ever, ever....bloody anything ever!

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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by cb4ever104 » 11 Jun 2018, 13:44

ch25 wrote:
08 Jun 2018, 16:43
That way you can check only if transistor is not defected.
In attachment is a circuit which will show you if transistor is legit or counterfeit. You go to the shop and you know before buy. Just put transistor to the socket and when led is lit, it is legit.
Kudos to sp8jux who invented that device.
tester rf.jpg
Chris
Hi Chris .

Just looking at the diagram you posted again . Why would a fake not light the led ? Don't they like working at 27Mhz ?

Sammy
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Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by ch25 » 11 Jun 2018, 14:02

Not at all. You can use 40MHz crystal to be more sure :)
You can't have too many antennas...

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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by cb4ever104 » 11 Jun 2018, 14:14

ch25 wrote:
11 Jun 2018, 14:02
Not at all. You can use 40MHz crystal to be more sure :)
OK . Thanks ! :thumbup:
30TM060
Paul aka "Sammy". (108) PY60 Old Paisley DX Group (RIP Rab Markie)
Ex GM0 , now EA5 .
Handle "Fortune Hunter" back in "the day"
Radios ....? Anything that says "TAIWAN R.O.C" on the back.

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Re: Testing The 2SC1969/Eleflow CB-20 With A Digital Multimeter.

Post by 13EL121 » 15 Sep 2018, 19:56

Bought three 2312s from my local dealer last week for 10,00 Euro. A bargin for sure with a matched pair. But they were the last ones and i will keep them. They are very rare here in DL and we have no Eleflow dealer.

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