PT/OT placement

[sliberty]

If it hums, just play louder.
Now, git er dun!

[RJ Guitars]

A few years back I tried a lot of orientations and it turns out that I rediscovered what many veteran builders already knew, including KF. As it turns out unless you want to put the transformers at opposite ends of the chassis, Aligning them with the stacks at 90 degrees to each other and then keep them on centerline was consistently the lowest hum.... Looks like you found the sweet spot.

[beasleybodyshop]

A few years back I tried a lot of orientations and it turns out that I rediscovered what many veteran builders already knew, including KF. As it turns out unless you want to put the transformers at opposite ends of the chassis, Aligning them with the stacks at 90 degrees to each other and then keep them on centerline was consistently the lowest hum.... Looks like you found the sweet spot.

RJ, when you say centerline, are you referring to keeping both transformers on the centerline of the PT? My understanding is you mount your PT first, then move your OT around until the hum is reduced.

[M Fowler]

I've never done the headphone trick or worried about it but some people love to fuss about things.

I mount the PT and OT 90 degrees of each other and in the case of the TW builds I keep them center line too.

But must also make sure you allowed for front valance and side cleat clearance first then mount PT followed by OT on a CT line of the PT.

[beasleybodyshop]

I've never done the headphone trick or worried about it but some people love to fuss about things.

I mount the PT and OT 90 degrees of each other and in the case of the TW builds I keep them center line too.

But must also make sure you allowed for front valance and side cleat clearance first then mount PT followed by OT on a CT line of the PT.

Thanks Mark. That valance clearance is a must!

[RJ Guitars]

RJ, when you say centerline, are you referring to keeping both transformers on the centerline of the PT? My understanding is you mount your PT first, then move your OT around until the hum is reduced.

Yeah, set that power tranny where you want it leaving plenty of clearance for your cabinet and front panel (thanks for the reminder Mark), then find the sweet spot for the output tranny using the headphone trick. What you'll find is that as you do the transformer trick and the hum goes away, the transformers will be nearly smack on aligned on their center axis. As mentioned it will get to some minimum level and that's as good as it gets. I haven't bothered with the transformer trick once I verified the results with a few of my early efforts.

[Richie]

as for the choke, many amps have them on the inside of the chassis. Sunn amps and some gibsons...., maybe down by the PT end find a place to mount it,if you have room.