Reveb Pan close to chassis - hum in reverb

[Normybaby]

I built this great amp using blackface scheme; preamp, tone stack and reverb coupled with beefed up trannys, ultralinier OP and a pair of KT88's all on a Weber Princeton type chassis. I stuck this all in a small head cab with just enough room for a reverb pan. I figured if the pan was grounded to the chassis it should work out...NO…… too much 60hz hum
Any ideas on how to solve this problem?
Thanks

[Enzo]

Get the OUTPUT end of the reverb pan as far from the power transformer as possible. I realize this pretty much just means at most turning the thing end for end.

Make sure the open side of the reverb pan faces away from the transformers.

Cut a piece of sheet steel to cover the open side of the pan and screw it on there. This to complete the shielding.

[Normybaby]

Get the OUTPUT end of the reverb pan as far from the power transformer as possible. I realize this pretty much just means at most turning the thing end for end.

Make sure the open side of the reverb pan faces away from the transformers.

Cut a piece of sheet steel to cover the open side of the pan and screw it on there. This to complete the shielding.

Wow...I think you've got it! Your right, the output is sitting right under the PT and if I reverse it, it will be away form the trannys sitting under the preamp tube. The shield on the bottom to insure nothing sneeks in....Great!
Thanks

[tubeswell]

Hi Enzo (Happy new year BTW)

I have also tried swapping pan ends around in this sort of small-enclosure/amp-head type situation, and find that keeping the Pan Output away from the PT helps somewhat. Thanks for the tip.

Also maybe trying different RT driver tubes (and elevating the heaters) could help as there might be a quieter 6V6/6K6 than the one being used (possibly)?

But when I try screwing a piece of steel onto the pan open side (using Accutronics pan = 8 nuts & bolts), I just get more hum (- probably caused by introducing ground loop(s) on the pan cover?). So if the OP was going to do that successfully, they may have to think about shielding the bottom of the pan another way - perhaps by mounting the steel plate on the bottom of the amp cab and running a wire from the chassis to the steel plate, whilst keeping some sort of insulation between the pan and the steel plate? 2CW

[Bruce / Mission Amps]

I wonder if you have a reverb pan that has the RCA jack grounded to the pan instead of floating?

[tubeswell]

I wonder if you have a reverb pan that has the RCA jack grounded to the pan instead of floating?

Nah the pan in that unit has a floating RCA jack on one side and is only grounded on the other RCA jack. (Don't know about the OP)

[Chuck H]

I've done this same thing. Along with rotating the pan 180* so the output is away from the trannies, leave the pan unsecured and shift it around in whatever space you have. IMHE transformers don't have a 360* EMF so you may find a quiet spot. I did.

Chuck