Head cab for Twin Reverb

[Dave Meis]

How tall should I make my head cab to accommodatethe reverb tank? All the after-market ones I see are barely tall enough to accommodate the tubes.. let alone the reverb tank, which I think should have some clearance
from the transformer.
Thoughts from folks that have done it?
TIA

[Rollin Schmidt]

Hi Dave, mine is 8 inches

[Steve Hinson]

How tall should I make my head cab to accommodatethe reverb tank? All the after-market ones I see are barely tall enough to accommodate the tubes.. let alone the reverb tank, which I think should have some clearance
from the transformer.
Thoughts from folks that have done it?
TIA

Yeah,you gotta be careful...I had a BF Twin chassis put into a head cab and never could use the reverb because the tank was too close to the electronics and it caused a horrible hum!If you are determined to use the tank, you should maybe build the head cab to the same height as a Dual Showman Reverb...I've never used one, but I expect Fender built that amp(basically a TR in a piggyback format)to a height that eliminated the hum...only downside is that the DSR head is almost as tall as a Fender combo amp!

SH

[Jerry Overstreet]

I found that when I built a few head cabinets, placement of the tank was crucial. I think mine were 10 inches. Experimenting with placement while it's all powered up and choosing the location with the least amount of hum.

In some cases, rotating the tank 180° might be necessary. I forget whether it's input or output side, but one of them needs to be furthest away from the transformer.

[Dave Meis]

@ Rollin: Do you have any hum at 8”?

Would there be a way to shield it? Say, like the thin plate on the top of the chassis part of the combo cab, but above the tank?

[J Fletcher]

You could install the tank in the speaker cab. Have done that successfully. The tank is already shielded by the metal housing that holds the springs . Jerry

[Raybob Bowman]

Just be sure the input to the reverb tank is at opposite end from the power transformer and you will be fine.

[Dave Meis]

Thanks guys! I appreciate the input!

[Rollin Schmidt]

Been using it about four years and it’s quiet as a mouse. Then again I might be deaf from sitting in front of that thing

[Dave Meis]

They can get loud!

Another consideration:
I was looking at the head cabs by Mojo, and they list a cab for a BF Twin. I called them, and the guy seemed to think there was a difference between the BF & SF concerning the mounting straps.
Has anyone put a SF in one of the Mojo cabs? Seems like an AB 763 would be the same..
Thoughts?

[Raybob Bowman]

SF and BF use the same chassis so yes, same chassis straps.

[Dave Meis]

@ Raybob:
He was thinking that the 3 screw lip at the back of the chassis pan required the holes to be maybe a 1/4”-1/2” different from front to back. The hole spacing is the same, but the location front to back was the issue … I don’t know, but he said he’d send me a diagram.. we’ll see.
Edit to add:
The SF has the 3 screw holes..

[Craig A Davidson]

I am thinking about doing this with my Twin. Can anyone recommend someone that can build one?

[Raybob Bowman]

Mojotone builds them.
https://mojotone.com/products/fender-bl ... 9809158240

I have one that is older but essentially new. Never been used. I can sell it for $250 plus shipping from South Lake Tahoe, CA. PM or email me if interested.

[Matthew Dawson]

Check out the tall Dual-Showman Reverb cabinet. Mount everything just like Fender and you will have no hum or electronic interference. The DSR is a Twin in a head cabinet done correctly. If Fender could have gotten away with something smaller they would have done so to save money on materials.

[Stephen Cowell]

Check out the tall Dual-Showman Reverb cabinet. Mount everything just like Fender and you will have no hum or electronic interference. The DSR is a Twin in a head cabinet done correctly. If Fender could have gotten away with something smaller they would have done so to save money on materials.

That's my experience... back in my hack-butcher days I added reverb to one of my BF Bassmen... never could get away from the hum. That Mojotone cab looks too small.

[Bob Carlucci]

I get it -"real Fender spring reverb",,, However, if you put your Twin head is a plain old "small" Showman type cab, and just put a modern digital reverb in the signal chain, it will sound every but as good with a lot less hassle.. At stage volume, todays digital reverbs even cheap ones sound just as nice as "real spring, tube driven reverb".. I've A'B them along with an expert, and neither of us could tell the difference... It would save you headaches in size and weight, and proximity hum.. Its only my opinion, but I would just forget the spring reverb, go digital, and enjoy your nicely portable tube head....bob

[Steve Hinson]

I get it -"real Fender spring reverb",,, However, if you put your Twin head is a plain old "small" Showman type cab, and just put a modern digital reverb in the signal chain, it will sound every but as good with a lot less hassle.. At stage volume, todays digital reverbs even cheap ones sound just as nice as "real spring, tube driven reverb".. I've A'B them along with an expert, and neither of us could tell the difference... It would save you headaches in size and weight, and proximity hum.. Its only my opinion, but I would just forget the spring reverb, go digital, and enjoy your nicely portable tube head....bob

Agreed-my favorite right now is the Catalinbread"Topanga"...
A knockoff off the old Fender tube reverb that looked like a little amp and sat on top of your Bassman,Showman,whatever amp you had that didn't have built in reverb...love it!

SH