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Old 17th Jul 2019, 9:37 am   #14
Mike. Watterson
Heptode
 
Join Date: Dec 2014
Location: Limerick, Ireland.
Posts: 901
Default Re: Ultra 761. Actually a T671.

I thought it might. A notorious place for high resistors. Often results in reception stopping at one end of a band, or if mains low (or batteries low).
If you have only 1/4W resistors you can put a pair of 33K in series. That's only 3% out and modern resistors are 2% or 1%. Twist the middle connection and cut short. Cut out existing one close to body and use pointy pliers to make hooks for new resistor wires. Unless the existing tags easy to solder.

An actual value of to 55K to 82K will likely be fine. It may even "work" at 106K, but that is 56% out and the oscillator might not start at any lower Q part of band, or band if the radio turned on.
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