28 May
2013
28 May
'13
11:20 a.m.
I am trying to find out some information about this transistor from my ASR33
Teletype. Ideally a datasheet to tell me what kind of transistor it is, and
I am almost certain that 73xx number is the date code. I can't find any
related transsitor numbers in any lists.
I haev found my Model 33 schematics. The transistor in question is the
TO3 one on the sub-chassis of the call control unit. It's 'Q2' in the
parts list, and from the schematic it's PNP. Alas no equivalent is given,
just the Teletype part number.
even better any information on whether it has a modern
equivalent. This
page: http://www.diyaudio.com/forums/parts/167680-vintage-transistors-6.html
suggests it might be a 2N176, but I am not sure. Anyone have any
Well, it's possible. According to Towers International Transistor
Selector, The 2N176 is in a TO3 can, it is PNP. It's also germanium,
which would go along with the measurements you made. On the other hand
the voltage ratings seem a little on the low side, but...
information, old datasheets or anything else that may
help?
I know you've tested this transistor out-of-circuit, but why do you
suspect a problem in that area at all? What is the machine doing wrong?
-tony