Hello,
I am re-capping a old 20MHz Hameg oscilloscope.
There is a 2.2uF capacitor in the time base circuit that determines the hold-off delay.
The cap on the board was 63V. I have at my disposal only 50V ones.
Lookinh at the circuit (attached below) I think that 50V should be OK and the cap is overspeced or they just used uniform parts to reduce cost.
I don't really see a reason for a 63V cap.
Please, let me know if I am wrong.
Full schematics here:
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Hameg/hameg_hm203-6_oscilloscope_sch.pdf