I am looking for a part for a Tektronix 491 spectrum analyzer. It is called the RFI filter or the Low Pass 275 V AC Filter The Tek part number as listed in my service manual is 119-0095-00. It is a metal can that on one end has the male connector that the AC cord plugs into. The other end feeds out the line voltage to the internal fuses.
The failure is interesting. At some AC voltage around 105 - 110 volts there is a breakdown and short that blows a 20 amp circuit breaker. The short is not permanent as I can turn the unit off/on and it will again work below the above voltage. I know it is the filter as this is the only thing that is before the internal fuse which never blows.
I have a work-around by running the unit on a variac and keeping the voltage at around 100 volts. But I am not sure how long this will work, so I would like to replace the filter.
Anyone know of a source?
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Thanks, Dave Woolf - K8RSP