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Old 3rd July 2014, 05:34 PM   #1
Champ is offline Champ  Canada
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Default Can Anyone ID this Transistor For Me?

Is anyone able to please ID this transistor and suggest a replacement for it.


It reads 93SE133 Then 1087 and then 6841.

I need it to replace outputs on a vintage amp. The receiver is 1967ish.

Any help would be very appreciated.
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File Type: jpg Hallmark CW120_2-1.jpg (79.4 KB, 319 views)
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Old 3rd July 2014, 06:10 PM   #2
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No answers but it's Solitron brand, listed as hard to find - (surprise!)
These guys aim to make money telling you that. 31SX347 ... - Datasheet Search Engine Download
The date of manufacture is week 41 1968 so I guess the amp would be a little younger than you thought.
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Old 3rd July 2014, 06:13 PM   #3
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Originally Posted by Ian Finch View Post
No answers but it's Solitron brand, listed as hard to find - (surprise!)
These guys aim to make money telling you that. 31SX347 ... - Datasheet Search Engine Download
The date of manufacture is week 41 1968 so I guess the amp would be a little younger than you thought.
Thanks Ian. I may have to find a parts unit if can't get the replacement. That may be even harder
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Old 3rd July 2014, 06:20 PM   #4
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I looked, too. A runaround.

Post your schematic here and I'm sure we'll find many modern substitutes.
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Old 3rd July 2014, 06:27 PM   #5
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Originally Posted by cliffforrest View Post
I looked, too. A runaround.

Post your schematic here and I'm sure we'll find many modern substitutes.
Alas clifforrest, no schematic. This is a local (Toronto) house brand receiver. I have another thread going on this, but I was not getting response on it. It is called The Hallmark CW120 receiver. Made in Canada and designed by Benzig & Breunig of Magnum Dynalab fame. Very scant info on this receiver.

She is not high end but sounds rather nice, even with an output failing, and she is very attractive. The FM is excellent. I would like to give the lady the dignity she deserves in her old age. I will do a full recap on her since there are a number of nasty lytics in there.
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Old 3rd July 2014, 06:31 PM   #6
Mooly is offline Mooly  United Kingdom
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Late 1960's. Could they be germanium ? Easy to check with a DVM by measuring the forward drops across the junctions.

If not then just determine if NPN or PNP, see what the rails are and add a safety margin and choose something appropriate. Could be as easy as a 2N3055 or 2N3773 etc.
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Old 3rd July 2014, 06:40 PM   #7
sbrads is offline sbrads  United Kingdom
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There's a good chance they're germanium PNP if the receiver is also from 1968. If the supply is positive earth and the speaker capacitor coupled I wouldn't mind a bet on it. The low Vbe would be a give-away. There was never much difference between TO3 germaniums, you could try OC35 OC28 or OC29 types.
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Old 3rd July 2014, 06:42 PM   #8
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Originally Posted by Mooly View Post
Late 1960's. Could they be germanium ? Easy to check with a DVM by measuring the forward drops across the junctions.

If not then just determine if NPN or PNP, see what the rails are and add a safety margin and choose something appropriate. Could be as easy as a 2N3055 or 2N3773 etc.
Hey Mooly, this is something I will have to do later on this month as I am out of town a fair bit and will need to get the new caps in first. I have included a shot of the amp board.

Would I measure the rails off of the last diode on the right side and top of the image?

It's the far right transistor that is running cold BTW.
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Old 3rd July 2014, 06:51 PM   #9
Mooly is offline Mooly  United Kingdom
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If the diodes are part of the main bridge rectifier then yes... but are they ? Perhaps just measure across the big silver cap (which looks like it will be the reservoir cap) and see what the voltage is there.
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Old 3rd July 2014, 06:54 PM   #10
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Originally Posted by Mooly View Post
If the diodes are part of the main bridge rectifier then yes... but are they ? Perhaps just measure across the big silver cap (which looks like it will be the reservoir cap) and see what the voltage is there.
There is another one of those large, reservoir caps, underneath the chassis as well. What do they actually do?
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