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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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What is a sutable alternative to small signal transistor type A970?
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 |
#2
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What is a sutable alternative to small signal transistor typeA970?
Dan Gruner wrote:
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. http://www.datasheetcatalog.com/data...9/2SA970.shtml |
#3
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What is a sutable alternative to small signal transistor type A970?
"Dan Gruner" wrote in message ... 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 Try searching for 2SA970, found them at ampslab, there is even a PDF that you can download http://www.ampslab.com/trans_2sa970.htm TOSHIBA LOW NOISE TRANSISTOR/ SILICON PNP / 120V / 0.1A / 100MHz. Wes. |
#4
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What is a sutable alternative to small signal transistor type A970?
Hi,
They are in the Grandata catalogue for £0.25 (+ £1.00 P&P+VAT) Tel 020 8900 2329 or www.grandata.co.uk In message , Dan Gruner writes 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 -- Neil J. Harris |
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