Model 90 - poor sensitivity - Printable Version

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+--- Thread: Model 90 - poor sensitivity (/showthread.php?tid=23509)

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Model 90 - poor sensitivity - lrbkrjr - 05-01-2022

I have a Model 90 lowboy that until recently was working very well. It was recapped, retubed, and aligned, etc. - the extent of my technical expertise. One day it became almost totally deaf, receiving only the one, close station. I don't see anything obviously wrong. What is odd is if I connect a jumper from the antenna connection to the oscillator tube anode (I think that's the tube), it receives pretty well. Probably not as good as it should if the earlier stages worked, but decent reception. While this "fix" solves my issue, my OCD wants to make it correct. Any suggestions as to where to look? My concern is one of coils failed and that's above my pay grade, plus the challenge of rewinding or finding a replacement.

Any advice would be appreciated.

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RE: Model 90 - poor sensitivity - Radioroslyn - 05-01-2022

Which version of the model 90 is it? Are all the heaters lit?

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RE: Model 90 - poor sensitivity - lrbkrjr - 05-01-2022

It’s the version with the single 47 tube in the audio amp. Heater meaning filaments, yes.

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RE: Model 90 - poor sensitivity - Mondial - 05-01-2022

Sounds like you might have an open antenna coil. Check both the primary and secondary windings for continuity.

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RE: Model 90 - poor sensitivity - lrbkrjr - 05-02-2022

I will take a look at that. Thank you.

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