Good point, I’ll just recap the monitor board then and start from there. If the transistors seem bad, I’ll bring the board to either the SystemSource workshop at the end of this month or the VCF one at the beginning of March. Cheers, Corey

On Jan 17, 2024, at 2:39 PM, Sentrytv via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:

From: Sentrytv <sentrytv@yahoo.com> Subject: Re: [vcf-midatlantic] Does anyone know the substitute germanium transistor for a B1182 Date: January 17, 2024 at 2:39:03 PM EST To: Corey Cohen <corey@vcfed.org> Cc: Herbert Johnson <hjohnson@retrotechnology.info>, vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>

Just an fyi If the transistor is suspect. There are many of us (in the group) who have testers that can identify the “type” of transistor, if it’s good. If you already know it is bad, then my point is moot. Personally I would go with the proper replacement type Ger. Vs Sil.

Funny, I have seen online so much conflicting information on this part number.

As someone mentioned, it is best to go with OEM part number instead of crossing to another manufacturer . There has to be a data book on the part “somewhere”.

Mike R.

Sent from: My extremely complicated, hand held electronic device.

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On Jan 17, 2024, at 2:21 PM, Herbert Johnson via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:



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I tried to find a cross-reference to B1182 transistor which is Q106 on the video board. This is a Germanium transistor in what seems to be a TO-66 case.

There's conflicting references to (2S)B1182 transistors or replacements as Silicon devices or germanium devices.

This device is on the video board of the ADM3A. So the video board (not CRT) could be from Ball or Motorola or other suppliers. It would be informative to identify the monitor/video board brand/model. Ideally a schematic of the video board showing the part.

also: A dead or good Ge transistor, will have a .2 or .3 volt drop across either junction (emitter base, base collector) with a "diode tester" voltmeter. A Si transistor shows .6 or .7 volt drop.

Regards Herb Herbert R. Johnson, New Jersey USA https://www.retrotechnology.com OR .net preserve, recover, restore 1970's computing email: hjohnson AT retrotechnology DOT com or try later herbjohnson AT comcast DOT net