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26th October 2007, 05:04 PM
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diyAudio Member
Join Date: Jan 2006
Location: Northern Virginia, USA
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Oscillating Transistors?
I have a bad transistor in the FM IF Board of the HK-330A receiver. It is an 2SA234, a Ge PNP small signal BJT. I got a cross to an NTE160, not wanting to buy ancient old stock. So, what is this oscillating issue and how can I determine if the replacement is a candidate? Can this happen with any transistor in the circuit, or just the outputs?
Here is service manual for the 330A showing the transistor, it is used TR-102 thru TR-105. I have all of them off and am ready to install 3 2SA234 and the 1 NTE, where would chance of oscillating be minimized if it could happen? http://manuals.harman.com/HK/service...K330a%20sm.pdf Cut sheet for NTE160: http://www.alldatasheet.com/view.jsp?Searchword=NTE160 Cut sheet for 2SA234: datasheetarchive site is down. |
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