Hi All,
I am currently repairing a powered mixing desk and it uses (on each of its input channels) a pair of A970 transistors for the microphone input preamp stage. A channel has gone down and I've traced the fault to both transistors which have failed. My question is can I replace these with an alternative I have to hand such as a BC550, BC560 or BC108/109? Cant find a data sheet on the A970, but I think it has a beta of at least 400. Any help will be much appreciated!
Dan
The transistor is probably a 2SA970, the prefix is often omitted from the marking on Japanese transistors.
Anyway you can get the datasheet from here, and it shouldn't be too hard to find a suitable replacement.
Try searching for 2SA970, found them at ampslab, there is even a PDF that you can download
TOSHIBA LOW NOISE TRANSISTOR/ SILICON PNP / 120V / 0.1A / 100MHz.
Wes.
Hi, They are in the Grandata catalogue for £0.25 (+ £1.00 P&P+VAT) Tel 020 8900 2329 or
In message , Dan Gruner writes
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