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 Post subject: Help with 2SC693G transistor pinout. From a Teac 4010SL
PostPosted: May Tue 04, 2021 2:59 am 
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I need to replace this but cannot find the pinout. Got a data sheet from Sanyo with lots of different cases but not a round one with no flat side. Since I will be using a substitute I need to be sure I have the orientation right.


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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 3:14 am 
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Well, I suppose it goes without saying that if it's got no flat side, and is perfectly round, there are only three ways to figure out the basing. One would be with a transistor tester or ohmmeter. The other, preferred way, would be with the schematic and you'd have to match up the other parts connected to that transistor, with each leg of the transistor.

The third way is to find the manufacturer data sheet. That's hit or miss on the internet with some of these older parts.

And if it's got no flat side, or flat spot, or other marking, I don't see how a data sheet would help. Are you SURE there's no indicator of any kind? How would the factory know which way to put it in? There should be at least an offset for the center leg...

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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 3:53 am 
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Barry H Bennett wrote:
Are you SURE there's no indicator of any kind? How would the factory know which way to put it in? There should be at least an offset for the center leg...


So far the only clue is that the number seems to be on the same side for the two in the circuit. I may have to test or as you point out trace the circuit connections. Still hoping someone has an obscure data sheet.

The good news is that a noisy transistor is the only problem I have found after doing the mechanical repairs.

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Last edited by black85vette on May Tue 04, 2021 3:58 am, edited 1 time in total.

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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 3:57 am 
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I've seen lots of them, but finding that case style took some searching!
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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 4:01 am 
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Elvirafan wrote:
I've seen lots of them, but finding that case style took some searching!

Bob



Awesome! Your searching skills are very strong. I looked all over and found nothing. Looks like there may be a flat on the bottom. I will have a closer look.

Thanks Bob!!

Edit: I had to bend the transistor over and move some other components enough to get a mirror down in there and sure enough, there is a flat on the bottom edge that you cannot see from above. Gotta love this forum when you need old obscure information. Seems to be part of the hobby.

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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 3:22 pm 
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I have not had good 'luck' with transistors in that package style, I prefer TO-92.
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 Post subject: Re: Help with 2SC693G transistor pinout. From a Teac 4010S
PostPosted: May Tue 04, 2021 5:04 pm 
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Worked on dozens of these in the 70s. Outstanding machine, congrats having one. Even the germanium version was remarkably quiet. Bias just beyond peak flattens them to 15K. Record at +3 on standard tape e.g. Ampex 641. Never used 3.75.

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