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Old 5th January 2008, 11:21 PM   #1
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Default Top cap tube users: pics of your amps?

Just curious what people have done to attach the top cap lead under the top of an amplifier chassis. Do you use a simple hole with rubber grommet, or some type of connector, or what? Of course, this is just a tiny excuse to show of your amp!
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Old 6th January 2008, 02:12 AM   #2
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sorry, no pix - but for some EL38s I used British made 6mm black plastic plates with phospor contacts. For running the lead, I was lucky enough that the Dynacos already have nearby slots in the metal work. Suggest some heatshrink tubing / rubber / grommet / strain relief to stop the wire from rubbing and potentially shorting out.

will take some pics soon

For future use I would like to build some top-plate cap adapters with the top-cap running to an octal adapter.
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Old 6th January 2008, 10:53 AM   #3
Conta is offline Conta  Europe
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Tubes with caps in my amplifier are mounted into case, and are layed on the side, none of them are sticking out.
http://audio.ring.lt/pw36/36_e.html
It is more safe, there is no high voltages above the chassis
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Old 6th January 2008, 08:59 PM   #4
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Hole + grommet is fine. Grommet may not be necessary if your wire is tough enough. If you're using a perforated sheet a la Morgan Jones just take your pick of holes. Re tubes inside the chassis: isn't half the fun in seeing the glow..?
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Old 6th January 2008, 09:19 PM   #5
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Quote:
Originally posted by kstagger
For future use I would like to build some top-plate cap adapters with the top-cap running to an octal adapter. [/B]
okay, any pics of these as well would be nice
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Old 6th January 2008, 09:33 PM   #6
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Look here:

http://www.vacuumtubes.com/6BG6.html

These tubes rock by the way. I made my own adapters by using the base of dead Chinese KT88's. Too ugly to post pictures.
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Old 6th January 2008, 09:43 PM   #7
pchw is offline pchw  United States
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This amp is mine. I didn't build it, but I brought to the operating state :-)
No grommet or anything, just a drilled hole; however, the wire has a tough braided cloth like material outside. The top plate is very thick, not much of a chance to cut through the wire.
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Old 6th January 2008, 10:45 PM   #8
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Here is the top half of my amp, showing the rubber grommet for the plate leads. I use a silicone insulated wire that is very limp and flexible, stocked in various colors by people who cater to model car enthusiasts. It's durable and stands up well to high temperatures. It also is a nice, snug fit into the tube cap
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Old 6th January 2008, 10:55 PM   #9
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Silicon wire, eh? I'm on it!

pchw, where did you get those plate caps? I'm always on the lookout for caps that actually fit. I hate the way many of the ceramic ones "fit" ie, do make a secure electrical connection, but look like they're floating above the tube.

Think I'll start a new thread on this...
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Old 6th January 2008, 11:04 PM   #10
KaDe is offline KaDe  Germany
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Quote:
For future use I would like to build some top-plate cap adapters with the top-cap running to an octal adapter. [/B]
I did it like this for a 6LW6 test run:
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