Reverb tanks and proximity to other components

[pjd3]

Hello,

I'm in the middle of trying to outline an odd, shaped amp and wondering if there are any "gotcha's" or interference elements when it comes to spring reverb tanks and what the rules are with them in terms of proximity to primarily speakers and transformers. This amp in its odd shape only has a height of around 10 inches and could put one of the reverb tanks (it's a stereo amp with a toroidal power transformer in the middle of the chassis with speakers more at the sides or ends of the amp cabinet.

Thats it really, I was curious if the input or output was more susceptible to transformer or speaker fields or, it the tank itself can create any issues with other components.

Thank you,
Best,
Phil D.

[martin manning]

The first rule is keep the return end of the tank away from the power transformer. The field from the PT will induce current in the transducer coil, which is connected directly to the recovery stage grid. I wouldn’t think proximity to a speaker magnet would be an issue.

[Stevem]

When in 1969 fender added reverb to the Bandmaster this is how much taller they had to make the cab so as to have no 60 hz power transformer hum issues entering into the amps reverb recovery circuit.

When Ampeg took there Jet model and added reverb they mounted it vertically on the left inside wall of the cab.

Your type of power transformer has far less stray 60 hz flux to deal with.

Since your short on room a 9” 3 spring type tank should work if you can’t fit the better sounding 14” type.

I dong know if the 9” tanks are made with the vertical mounting option like the 14” tanks are .

Speaker magnets are not a concern.

[pjd3]

Thank you for the informative info and pictures.

OK, I might have some hope for having two of those 16.75" long reverb tanks fit at the bottom of this odd little amp. (I kinda like the "sound" of those MOD 3-spring, medium decay long tanks - (I'm actually "hearing" with my eyes, ha right).

The inner length of the cabinet is 46 inches wide (yup - you heard that right, its going to be an odd, odd duck, just like his dada).

So, the sum of those two tanks length is 33.5". That leaves us with 46 - 33.5 = 12.5 inches of left over space to slide around and position them. That should do it especially if I don't have to worry about the speakers. the 8" speakers are positioned all the way to each end and the toroidal transformer is 5" in diameter.

Being that the cabinet is 10" deep and the speakers are around 3.5" deep, there should be plenty of space to prudently place them to keep out of trouble. The tanks are 4.24" wide/no cover. I suspect that careful shielded wire and routing will be something I need to pay attention to as I've never implemented a spring reverb into any of the builds.

Thanks for your input on this having never done it before but, going to do it soon!
Best
Phil D.