UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Improving Selectivity In Vintage Receivers

G6Tanuki · 26th Oct 2022, 9:03 am

Small ceramic filters for valve receivers do exist, Trio-Kenwood used them in their 9R59 back in the 1960s.

I also remember that Toko made some midget mechanical filters with built in matching transformer intended for use in FET based circuits, these had high impedance inputs and outputs.

MFH41 and 61 series if my memory is correct.

26th Oct 2022, 9:03 am	#2
G6Tanuki Dekatron Join Date: Apr 2012 Location: Wiltshire, UK. Posts: 14,007	Re: Improving Selectivity In Vintage Receivers Small ceramic filters for valve receivers do exist, Trio-Kenwood used them in their 9R59 back in the 1960s. I also remember that Toko made some midget mechanical filters with built in matching transformer intended for use in FET based circuits, these had high impedance inputs and outputs. MFH41 and 61 series if my memory is correct. __________________ I'm the Operator of my Pocket Calculator. -Kraftwerk.