Vacuum Tube Sleeve Or Cover Or

[space cowboy]

whatever it's called, I can't get them off.

the circuit board below the sockets will break apart first.
again.
the plastic sleeve will come off, but the metal ones...
any oldtimer secret solution?
I have a small heat gun...

 

[Captain Kilowatt]

WHOA! STEP AWAY FROM THE ELECTRONICS VERY SLOWLY!

Seriously you have no idea what you are doing do you? Those are NOT vacuum tube shields they are electrolytic capacitors and are soldered to the board. They are likely multi-capacitor units with two or more capacitors in each can although they may be single unit types. The metal case is ground and the other tabs are the capacitor connections. They are usually marked on the case and identified by geometric symbols such as a square, triangle, or a "D" shape on the underside.

 

[space cowboy]

apparently not. haven't seen caps like that before.

 

[Captain Kilowatt]

BTW please don't take offense to my first post. I meant nothing by it. Just my reaction after having spent nearly 35 years doing electronic service and seeing a question waaay off base like that one.

 

[space cowboy]

well, I've got a couple community college electronics course I took 20 years ago.
as long as you keep giving me the respect I deserve as an technician...

 

[wavrider]

Unsolder them then remove them.

If you insist on the destructo method of removal, maybe a saws all??

 

[Radio Tech]

Those are not tubes. They capacitors. You will need to write down or take a picture of the bottom of them before removing. Then unsolder the wires and ground tabs. Bend the ground tabs straight and pull them out of the back lite.

BTW, be very careful. Those cans can hold as much as 450 volts DC on them.

Also if you look on the sides of the can you will see several ratings in MF along with voltage ratings.

 

[Beetle]

Those are not tubes. They capacitors. You will need to write down or take a picture of the bottom of them before removing. Then unsolder the wires and ground tabs. Bend the ground tabs straight and pull them out of the back lite.

BTW, be very careful. Those cans can hold as much as 450 volts DC on them.

Also if you look on the sides of the can you will see several ratings in MF along with voltage ratings.

Since he's a "technician", the high voltage warning shouldn't be necessary...

 

[GnG8d]

I think he meant technician class amateur, not electronics technician. But that's a guess.

 

[Captain Kilowatt]

I think he meant technician class amateur, not electronics technician. But that's a guess.

That's what I was thinking as well.He did say he had a couple college electronics courses but it was 20 years ago. An electronics tech would have known they are capacitors and not vacuum tubes.

 

[space cowboy]

no, I meant respect as an electronics tech.
which basically means none at all.

I wasn't trying to remove them. I was trying to get the cover off the tube to see what tubes they were.

my grandfather bragged about that organ, it was tubes, not that new transistor crap.
those caps are like nothing I've seen before, and look remarkably like the vacuum tubes in my guitar amps with their metal covers.
I took his word and didn't look close.
just like he took the word of the sales man who suckered him into a purchase...

oh well, I thought I had a nice little tube amp.

beetle - don't worry, I was working one handed.

I'll need to look up the caps and see which connections to use to discharge them, they've been unpowered for at least a decade, so I don't think there's much to worry about, but I'm ignorant, not stupid.

 

[Radio Tech]

If you look at the bottom of the first cap Captain Kilowatt posted you will see how they are configured. The 4 outer tabs are ground. In the center there could be 1 to 4 tabs. That means there could be 1 to 4 capacitors inside that metal can. On the side of the can you can see writing. A symbol followed by the specs of that leg.
Each of the legs are a seperate capacitor and each will need to be shorted to ground by a resistor. If you never powered it up then they may be discharged. But always assume they are not.

On another hand they may work ok. I just pulled down a 1950's oscilloscope and the metal cans are spot on and have an ESR of .20 on all legs. Just never know when it comes to these things. These type of capacitors are in a lot of vintage electronic equipment and were the norm of the time. All the first CB base stations had these.

As far as the tube shields you can always see the tube inside the metal shield. The tops are always exsposed. This is so air can flow. If it was fully incase it would cook itself.