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Old 5th Nov 2013, 11:58 pm   #5
Stefan_O
Retired Dormant Member
 
Join Date: Nov 2013
Location: Bremen, Germany
Posts: 11
Default Re: Marconi 2022C - Stopped working below 62.5 MHz

Thank you very much. It seems that IC2 is broken. While at pin 1 I´m able a measure a decent input level of about 100 mV, output is only about 20 mV (measured with an uncalibrated TF 2603, so this values are only relative).
All others seem to be fine. Is that plausible with the problem I described?

I searched for NOS parts, all I found is the offer for 290 Rand in South Africa (not original part) and on Ebay there is a NE68519 and a MMIC CGB-1089Z listed as a OM345 "replacement project" (seller is from Cornwall). Any idea what would fit here? For IC2 the input level is already quite high compared to the other OM345.
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