Re: Marconi Radio communication Test set 2955A
I know it's a fairly common problem with the 2955, and unfortunately both mine have intermittent attenuators. We used to send them back for repair to Marconi with this fault as it required re-calibrating after so I have never taken the attenuator block apart. Exercising the relays by winding the signal level up and down a few times seems to help sometimes. One day I may be brave enough and find the time to dismantle mine. I'll bet the relays are expensive too. I suppose you could use a fixed external attenuator on the output to slug the real level output to a range that is working but this would be very much a last resort, and also creates the risk of blowing up your attenuator if you happened to transmit into it by mistake.
Alan.
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