I noted the set on Radio Museum: There seems to be some misleading stuff there if you try to download. I often wonder if its been hacked? The Malware program here just loves blocking things that pop up there.

You've mentioned that a number of times on here, but I have never had any such issue myself, nor to my knowledge has anyone else reported any such issue. My suggestion is that the problem is at your end with some sort of false positive.

It is odd, as I have actually downloaded a circuit without issue. One has to be careful as my name appears as a contact for a couple of organisations, Which seems to give Carte Blanche to several that need to get a real job, to bombard it. Rare to actually have a week sometimes a day without some grub ringing up, or trying to get into the system.

You can replace OC44s and OC45s with silicon BC557s with a performance improvement and for a few cents. Reason is, the circuit had to tolerate huge variations between those early transistors.

Some years back I had a British radio in which the mix/osc and both IFs were dead. OC169, OC170 from memory. BC557s in all positions resulted in a hot performing radio without even needing alignment.