Moscode 600 noise every 1.5 to 2 seconds

At turn on, I get a fairly loud noise similar to the noise I get at turn on, but more than twice as loud which will repeat itself every 1.5 to 2 seconds or so.
There are 4 fuses on the board as well as 1 on the power supply on the back of the unit next to the power cord.
It blew one of the fuses on the board. I replaced that fuse as well as the center 6922 and it makes the same noise

Ten yrs ago I replaced all of the caps in the signal path, according to a post somewhere here at diyaudio, with Jentzen caps.
The amp was nodded by George Kaye and had the large Solen caps put in parallel with the filter supply caps.
The filter caps as well as about 6 other electrolytic are original, as well as the black gates
Is this the sound that big cans would make if they are past due? Is this the sound of bad caps somewhere ?
Thanks for your help