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Old 1st Jan 2023, 10:59 am   #89
Jon_G4MDC
Nonode
 
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Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,013
Default Re: Improving Selectivity In Vintage Receivers

Yes I already have the filter. Actually I should have two of them, I know I bought a pair when they were plentiful. No idea where the 2nd one has gone. At those prices I should put more effort into finding it!

If will be good if Andrew can tell us first hand what he did. I joined in Nov 2015 so that thread had probably gone well down the list by then.

My mixer anode assembly is shown below. Definitely no gap between the coils.
I agree about the winding ends but it's been OK for ~84years. I'm not going to put them on the vibration table.

I'm wondering whether I can estimate the mutual inductance of those coils using a GDO. I have no other method to measure inductance.

PS Happy New Year to all.
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Last edited by Jon_G4MDC; 1st Jan 2023 at 11:12 am.
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