Well it's nearly 4am and I am on the prowl and wow wee what I have I found; back in
2014, there was a thread on this forum by Andrew (GW3OQK) who had put a pair of (3-legged?) ceramic filters in to his 1155 and reported how amazingly good the outcome was. Moreover, he later did the same thing with an HRO.
He didn't show a diagram, and the written description is not "crystal" (
) clear, I will PM him and ask him to join us. He was last on the forum in March '22.
https://www.vintage-radio.net/forum/...d.php?t=107140
B