Here are my suggestions: for the unregulated voltage circuit with U05B (2.5A, 100V) diodes, replace with UF5405 (3A, 500V) fast, soft recovery diodes. For the regulated voltage circuit (H806, H807) with W06B (0.75A, 150V) diodes, replace with UF4005 (1A, 600V) fast, soft recovery diodes. You should also replace the H808 diode that supplies the lamps with a UF4005 diode. Note that both suggested replacement parts have a forward voltage drop of 1.7V to slightly lower the DC voltages closer to the original specs with today's AC mains voltages that are higher than when the units were originally made.
