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Old 8th June 2009, 02:10 PM   #1
diyAudio Member
Join Date: Jun 2009
Angry Fried Reel To Reel tape recorder

I was calibrating the record and play levels on my Akai 4000DS mk II Reel to Reel tape recorder, and I accidentally shorted something out and fried at least one of the transistors! I need to find some replacements, but don't know where to go, can anyone help? I don't yet know witch ones are fried, but if I replace them all I know I'll get it working again.

these are the transistors I need:


It's quite an old machine, from 1972, so I don't know if those particular transistors are still in production. Can anyone tell me where I can get them? Or where I could get suitable substitute replacements?

I've added a picture to help identify them.
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Old 8th June 2009, 02:51 PM   #2
oshifis is offline oshifis  Hungary
diyAudio Member
Join Date: Mar 2004
Location: Budapest, Hungary
You can find the datasheets by referring them as 2SC1312, 2SC1647 and 2SC458, respectively. The leading 2S is just not printed on the body. I think they are all small-signal, small-voltage NPN transistors, and you can replace them with 2N2369 or BCY58 or the like if you identified the pinout.
Before replacing them, I'd measure them for short-circuit or even better for h21e using a DMM that is capable of such measurement. As a simple test, the B-E and B-C should behave as a diode, the C-E should be open circuit, measure with a DMM in 2kohm range. Test them off-circuit.
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