Coral Stentor 100 help!
Hi, First post, helping a friend. Trying to repair the amp and I have a schematic. However, the transistor numbers don't make sense. I cannot figure out what a "9138" or a "3155" really are. Anybody been down this road? I think the 3155 is bad, since it fails on a transistor tester as Si or Ge, PNP or NPN.
The schematic shows the 3155 as PNP, and I can probably guess on acceptable parameters for the transistor specs, and finally, since the transistor was made in 1967 (mfgr date code), I'm guessing it is Germanium. So, I could hope I'm right and find something close, but it could get costly. Any ideas from the more knowledgeable folks?
Old days the (2N) was left off of transistors and (1N) for diodes on schematics.
2SA/2SB could also be dropped.
Maybe risky? http://www.onlinecomponents.com/all-...tml?p=10002776
Hi, thanks for the reply. Unfortunately, the specifications for the case don't make sense. The transistor I have is a TO-3 case, all metal, screws to hold it down, typical power transistor. The 2N3155 is (apparently) not that case style. The transistor I have does not even have a manufacturer, although the date code is 6722, and there is also a small 466 on it as well.
Maybe a 2SC3155? http://alltransistors.com/transistor...ansistor=14217 old lazy schematics are a PITA.
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