Sentura II Standby Switch

[patlaw]

The standby switch on a Sentura II is between the rectifier tube and the first filter capacitor. On the Fender Twin, it's between the first filter capacitor and the choke. What practical difference does it make?

[Isaac]

Without doing a direct comparison, my guess is that the Fender method results in a higher voltage on the first cap when the amp is in standby, but powers up more quickly when switched into run mode. That higher voltage could be an issue if the amp is running near the cap's voltage limit.

[patlaw]

Without doing a direct comparison, my guess is that the Fender method results in a higher voltage on the first cap when the amp is in standby, but powers up more quickly when switched into run mode. That higher voltage could be an issue if the amp is running near the cap's voltage limit.

It doesn't appear to make much difference. The cap that I'm using to replace it (two in series) will handle 900 volts, so that's not a problem.