• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Board placement

Folks, I am building a paraphase driven 6V6 power amp into an old Knight PA chassis (that I quite like the look of). This happens to have just the right amount of octal sockets in it for my build (which avoids having to drill new chassis holes), but converting this originally mono chassis into a stereo unit (with the salvaged Scott iron I am using) limits very much where I can place my transformers. Underneath I am faced with having to mount my “pre-amp” turret board (basically all of my front end components from the grid leak resisters through the coupling caps, AC balance control, etc) directly under the power transformer.

Bad idea, or really not such a big deal in practice?

Justin
 
Generally, you want all that stuff as far away from the PT as you can get it. If the chassis is good at shielding, you run the wire properly etc, it might be fine.

Also, you could try and build that turret board in a Faraday cage.
 
I would suggest keep the low level stuff away from the PT. You can get magnetic coupling into the signals and grounds of your circuit. Try and keep any signal/ground loops short with little area for the flux to go through. Your probably OK with the final grids.