Is a selectable B+ switch for different preamp voltages doable without popping?

[stevehoover]

Hi folks, I'm trying to figure out if it is possible to switch B+ voltage without getting a loud pop.

I've built a "Fender Time Machine" with separate BF and tweed preamps mixed down to a single ended 5881.

I would like to be able to safely switch preamp voltages in each of these channels for "period appropriate" voltages...(it sounds pretty cool when I do).   However I'm concerned about damaging some expensive NOS
Preamp tubes as well as other components and speakers.  It's a bummer to have to power down the amp to do this now.....not the end of the world, just inconvenient.     Any input would be appreciated..Thx!

[PRR]

Won't pop much:

[jojokeo]

 It's a bummer to have to power down the amp to do this now.....not the end of the world, just inconvenient.

Can't you simply either turn off the standby or just turn down the volume before switching? Or better yet, build two separate sections with their own input jack and design the voltages separately for each. Then join the two as a typical Fender amp would then no switching is necessary on the amp itself. You then could use an AB-Y box to switch between both channels on the fly via foot pedal if that is what you're truly after?

[kagliostro]

What PRR says

K

[jjasilli]

Instead of a SW maybe you could use a variable voltage circuit.