Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by aortizjr, Mar 31, 2005.
What do you use for the glue to kinda shock-mount Filter Caps?
I use the hot-melt polythene stuff with a glue gun - you should be able to get it easily at any home DIY store.
currently I'm using some blue silicone automotive type gasket sealant...
Silicone caulk when necessary, though I really prefer proper holes in the board and a tie-wrap -- makes life easier for the next guy inside the amp.
Also, as caveat, be careful where you spread the goop. It has capacitance
I recently worked on a 120W Peavey that had everything fastened down with hot glue.It lost the bias supply to the power tubes and got so hot it melted all the glue.It ran down thru the tube sockets and everywhere else.What a mess.
E6000. Walmart. GREAT stuff!
Yeah but that stuff is crazy... Admittedly it might be 10+ years before these need to be replaced, but damn....
Like anything, you can overdo it. I wouldn't say that's a reason not to use it - I wouldn't put enough on (or anywhere close to something like a power tube socket) that this could happen. You don't need much to secure a cap, it's a very strong material - but actually more easily reworked or removed than most of the other types, which is one reason I like it.
Was that factory, or an over-enthusiastic tech, BTW? I don't remember seeing that much in any Peavey. I'm also a little surprised that it didn't blow a fuse if the power tubes were running wide-open like that. Something not quite right there.
It's also a bad idea to use any kind of glue to hold down power resistors, unless they're way over spec in the first place. All plastic glues are good thermal insulators and tend to make the resistor run much hotter. I've seen it done quite a lot though.
It was factory.Glue everywhere.I wish I could remember the model.It was a newer tube amp with all the bells and whistles.When the bias ran away it fried a couple of tubes.The owner figures it's a bad tube and stick some oddball tubes in he has laying around.the fuse was blown when I recieved it but apparently it did not blow quick enough.
My Kid's (Peavey) 5150 has the "factory Glue" all over the place. There are several fuses on the board as well (4, IIRC)
One of my pet peeves in newer mass-produced amps is the hot-melt threads all over the inside of the amp (as the assembler or robot goes from glue-point to glue-point he/she/it leaves a trail of spider webs).
Over time, particularly in smokey bars, these collect dust and nicotine and can become conductive.