Evening all,
I've recently acquired a Marshall 2266c Vintage Modern combo. I've yet to test it out in a suitable environment, as my tiny man-cave isn't the best place to really crank an amp (so much stuff vibrates or resonates oddly) but I have noticed what I read is a common problem with these (and many other) combos: rattling. It sounds like the power valves (BIG KT-66s) or something is making an odd noise as the volume dials up.
Does anybody have any ideas on whether you can get dampers for these valves? Hotrox do others but not for such big valves.
Any thoughts welcome.
Thanks!
Comments
there is another compound that can stand the heat
I bought loads
send me the diameter and I'll see if I have any left
My band, Red For Dissent
My band, Red For Dissent
I don't have any that large, here's where I got mine
btw I also found that, as well as an amp vibrating its own valves, if you have a few amps in a room, they rattle along sympathetically like guitar strings even when not in use, especially if they rest on an active cab.
Here's my general advice on valve dampers:
I've looked around and found Viton ones in the UK, http://www.polymax.co.uk, and I've bought some from there.
Silicone is hard to find.
There are some preamp sized ones cheap from China on ebay (search for "tube dampers")
Viton is rated to about 205 centigrade (and much higher peaks), SIlicone to 250C
I measured a 6v6 in my 5E3 clone, and it didn't go past 120C, and came down a little when driven hard
I'm assuming none go past 200C very often
The quantity I got wasn't much cheaper than from the US, about 20p for thinner cross-section (2.5mm) ones, 40p/50p for bigger ones (5.5mm) (plus vat and postage)
here's what I ordered, and the prices from 5 years ago:
BS122V75
BS122
20
£0.18
£3.60
BS124V75
BS124
20
£0.18
£3.60
BS125V75
BS125
20
£0.20
£4.00
BS320V75
BS320
10
£0.40
£4.00
BS322V75
BS322
10
£0.44
£4.40
BS323V75
BS323
10
£0.46
£4.60
BS324V75
BS324
10
£0.50
£5.00
these are 28mm, 32mm, 34mm
which covers most output and rectifiers I have. The thicker ones don't stretch much, so I get just under the valve diameter.
I put thick ones where the internal metalwork inside the valve touches the glass, and another thinner one in the middle for luck.
Advice seems to be "don't cover more than 35% of the glass"
I've now used these for over 5 years, they don't melt in any of my amps
https://www.polymax.co.uk/o-rings/rubber-viton-oring/
use this page to get the size you need
My band, Red For Dissent