OT mounting

txstrat · 10-08-2009, 07:36 AM

Hi folks,

The OT for my newest build has no covers. I mean, if I bolt it to the underside of the chassis (sort of blackface cabinet with controls on the front side) the solder connections would be accessible and, if the amp is on, somebody might electrocute himself when grabbing inside the back of the cabinet.
Thatfore I think about cutting a hole in the chassis and mount the OT just like the PT with the solder connections inside.
What do you think? Would this induce more hum or other problems (other than having less space for the eyelet boards)?

thanks

tubeswell · 10-08-2009, 04:35 PM

Hi txstrat

I have built a couple of amps using PTs without end covers (but with copper band shields), and done X-mount style - through the chassis. They work fine. I wouldn't have the contacts exposed outside the chassis either - for safety reasons as you note.

guitician · 10-08-2009, 05:12 PM

Or, you could insulate the connections with something like phenolic or fiberglass board. Or just use some kind of shrink sleeve or rubber adhesive/cement like silicone.

tedmich · 10-08-2009, 06:57 PM

I think in x mounting the magnetic field projects up (no problem) and down so you shouldn't run signal under it. If looks aren't important a half tube of PVC conduit mounted on small L brackets can shield the contacts well, I'd avoid glue, or use electronic silicone, not common acidic RTV.

txstrat · 10-09-2009, 07:35 AM

Those are all very helpful suggestions. Thanks.

10-08-2009, 07:36 AM	#1
txstrat Senior Member Join Date: Mar 2008 Location: Germany Posts: 752	OT mounting Hi folks, The OT for my newest build has no covers. I mean, if I bolt it to the underside of the chassis (sort of blackface cabinet with controls on the front side) the solder connections would be accessible and, if the amp is on, somebody might electrocute himself when grabbing inside the back of the cabinet. Thatfore I think about cutting a hole in the chassis and mount the OT just like the PT with the solder connections inside. What do you think? Would this induce more hum or other problems (other than having less space for the eyelet boards)? thanks

10-08-2009, 04:35 PM	#2
tubeswell Supporting Member Join Date: Feb 2007 Location: Wellington NZ Posts: 2,663	Hi txstrat I have built a couple of amps using PTs without end covers (but with copper band shields), and done X-mount style - through the chassis. They work fine. I wouldn't have the contacts exposed outside the chassis either - for safety reasons as you note. __________________ Building a better world (one tube amp at a time)

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10-08-2009, 05:12 PM	#3
guitician Senior Member Join Date: Aug 2008 Location: Phoenix Posts: 341	Or, you could insulate the connections with something like phenolic or fiberglass board. Or just use some kind of shrink sleeve or rubber adhesive/cement like silicone.

10-08-2009, 06:57 PM	#4
tedmich Senior Member Join Date: Apr 2008 Location: PDX Posts: 501	I think in x mounting the magnetic field projects up (no problem) and down so you shouldn't run signal under it. If looks aren't important a half tube of PVC conduit mounted on small L brackets can shield the contacts well, I'd avoid glue, or use electronic silicone, not common acidic RTV.

10-09-2009, 07:35 AM	#5
txstrat Senior Member Join Date: Mar 2008 Location: Germany Posts: 752	Those are all very helpful suggestions. Thanks.

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