Hamish, 140's may have the same basic circuit inside, but they really are crude, coarse cr@p of the finest order. Don't ask me why, but the very best of this circuit as made in Salisbury was always the 135's and Nait 1 & 2, the CB and Olive 250 need very careful setting up and the 180 is good when new, but I read elsewhere it goes off big time as it ages.....
I can't go on and I can't go back, I don't feel so matter of fact,
I tried and tried to make good sense, What's the good to try it all again?