the following were done on the amp:
1. replaced 4 coupling caps to 0.1uf/600v Illinois Caps
2. replaced 2x2.5uf orange drops to 3uf/600v Wondercap (vintage, used in Audible Illusions). this may be hard to find. i believe you can use 3.3uf illinois caps too.
3. NOS sylvania 5751 replaced with NOS RCA 5751 Command Series Black Plate Triple Mica
4. rectifiers replaced with IXYS DSEI 12-12A 1200 volts max 11 amps HEXFREDS
5. time delay circuit installed with diode for soft start
andrew did 1,2,5. i supplied 1,2. i did 3,4. andrew says, he will make 1 standard in his amps.