"Dave Woolf" wrote in message
...

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

Well, with some care, you could make one. It's a lp filter that cuts off
somewhere above 60 Hz. If you don't want to build one, try to find some
discarded hospital electrical equipment. They all have filters that are
tested for low leakage to the chassis.

73,

"PM"