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Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Hello, I need a tube socket for an 833a tube. They seem to be quite $$$ new. I am seeing prices around $50.00 plus shipping for one new socket. Anyone here have some used ones they could sell me for a better price?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
I sometimes find myself unable to find a socket for specialist parts, and have developed a few techniques for dealing with the problem.
If the pins are large and far apart, I take the metal insert and its screws out of a plastic 'chocolate block' terminal block, and use these to secure the pins.
If the component generates significant heat, I drill the pin pattern through one or more fire tiles using a diamond bit, and then screw the choc block inserts onto the pins where they come out the other side. Glass rope and glass rope adhesive used in oven door seals can be used to reinforce the ceramic tiles where necessary.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Proud Mary wrote ...
I sometimes find myself unable to find a socket for specialist parts, and have developed a few techniques for dealing with the problem.
If the pins are large and far apart, I take the metal insert and its screws out of a plastic 'chocolate block' terminal block, and use these to secure the pins.
If the component generates significant heat, I drill the pin pattern through one or more fire tiles using a diamond bit, and then screw the choc block inserts onto the pins where they come out the other side. Glass rope and glass rope adhesive used in oven door seals can be used to reinforce the ceramic tiles where necessary.
I also was considering building one, but figured I would wind up spending the same amount on the materials and tools in order to make it work right. I was going to use some aluminum clamp style electrical connectors that I found at the hardware store, but the holes are a little too small. (Now I would need to buy a large drill bit to widen the holes and thus add to the expense).
I guess I will just bite the bullet and buy one on ebay. I will deffinately treasure it! Matt
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
It is pretty cheap and easy to make a tube socket if you have some suitable connectors.
I needed to make a socket for the donated 4CX250BM i got from brtaman. I took apart an old socket that was made for small preamp type tubes from televisions. I cleaned the conducting surfaces up with sandpaper, but that is irrelevant. I put the connectors on the pins of the 4CX250BM and arranged them how they would be in a real socket. I took some polymer hobbiest clay, and made a flat sheet about 3-5mm thick, and i pressed it onto the base of the tube. The ends of the connectors that are to be soldered stick out, and the middle pin on the base of the tube stuck out, and there was an indention in the clay for the key to ensure the tube is inserted the correct way. I took the clay off and baked it.
I baked it a few minutes too long, so the corners burnt. I tested with 2kvac in between all of the terminals for about 10 minutes with no failures and no measurable conductivity. After warming up of the tube with a high CFM squirrel cage fan on the radiator with nothing but filament bbeing powered, it burnt the clay, but this would not happen with other tubes, seeing that their base is normally cool.
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
Arcstarter wrote ...
It is pretty cheap and easy to make a tube socket if you have some suitable connectors.
I needed to make a socket for the donated 4CX250BM i got from brtaman. I took apart an old socket that was made for small preamp type tubes from televisions. I cleaned the conducting surfaces up with sandpaper, but that is irrelevant. I put the connectors on the pins of the 4CX250BM and arranged them how they would be in a real socket. I took some polymer hobbiest clay, and made a flat sheet about 3-5mm thick, and i pressed it onto the base of the tube. The ends of the connectors that are to be soldered stick out, and the middle pin on the base of the tube stuck out, and there was an indention in the clay for the key to ensure the tube is inserted the correct way. I took the clay off and baked it.
I baked it a few minutes too long, so the corners burnt. I tested with 2kvac in between all of the terminals for about 10 minutes with no failures and no measurable conductivity. After warming up of the tube with a high CFM squirrel cage fan on the radiator with nothing but filament bbeing powered, it burnt the clay, but this would not happen with other tubes, seeing that their base is normally cool.
Pretty clever of you, but the 833a is a big tube and I dont have any suitable connectors. I think I will just take a hit and go for a porcelain socket on ebay. Thanks, Matt
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Oh i am sorry I guess i misread the title to say 811A.
You can however make a socket by just making clamps to clamp the filament/cathode connections and screwing that to some wood or whatever. But yea, if you have money, i would go to eBay anyway
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WANTED: 833a tube socket
I was going to use some aluminum clamp style electrical connectors that I found at the hardware store, but the holes are a little too small. (Now I would need to buy a large drill bit to widen the holes and thus add to the expense).
I guess i misread the title to say 811A.
