I wish I could send a picture to this thread but I got the part number from the actual board not the maintenance book or pdf. I checked both the physical book and the online pdf’s and Q106 isn’t actually listed in the parts list but is on the diagram and obviously actually there. Cheers, Corey corey cohen uǝɥoɔ ʎǝɹoɔ Sent from my iPhone
On Jan 17, 2024, at 2:21 PM, Herbert Johnson via vcf-midatlantic <vcf-midatlantic@lists.vcfed.org> wrote:
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