Voltage switching: Where do you put the switch?

1/20/2000 5:27 AM

Todd

Voltage switching: Where do you put the switch? Well, the "subject" line isn't quite what I want   to know. I want to put a DPDT switch immediately   after the PT (and pre-rectifier tube) to switch the   ultimate B+ voltages (assuming a PT with two   different VAC secondary taps). However, I'm   concerned that the drop in all the stages will   not be proportional and that it will mess up   the original proportionas of drive and gain   in each stage. Example: I don't know if the   peak-to-peak drive coming out of the driver   will be reduced to the correct proportion to   the new grid bias voltages of the output section.     Does switching the B+ post-PT and pre-rectifier   mess up the gain and voltage proportions in an   amp or not?     I'm new to the idea of voltage-switching (too   old school perhaps?) and I may not be clear   with my question. Hopefully somebody gets the   gist of what I'm asking. Thanks in advance!   TJK