Amplifone Tube Swap ...

[kentmurphy]

I am swapping my old Amp tube with a NOS one. I've removed the rings, the yoke, and I have pulled the tube from the cabinet. I have a few questions though.

There is tape around the neck of the old tube. See the first pic. Do I need to put a similar type of tape on the new tube?

There is tape inside the yoke. See pics 2 and 3. Should I leave it there or remove it?

The yoke windings are dirty. Would it hurt to wipe down the windings with a dry rag?

http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap1.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap2.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap3.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap4.jpg

Thanks,
Kent

 

[Level42]

Do you mean the strips here:

Those are the strips to be used to do the edge convergence
(see my video about doing this, but this is the LAST step !: http://www.youtube.com/watch?v=QYB1L8AIeq4)

The tape on the yoke I would definitely leave, it looks like it's holding the wiring in place !!!

Please post everything about your swap here, I'm going to have to swap a 25" tube on an Amplifone (yikes !) soon !!

 

[kentmurphy]

no ... do you see the white tape wrapped around the neck? ... that is what I am referring to ...

Kent

 

[kentmurphy]

ooops ... just read your whole response ... the white tape is on the old tube ... not certain if I need it on the new one ....

 

[Level42]

I really have no clue about that tape around the neck....anyone else ??

 

[VectorJunkie]

I really have no clue about that tape around the neck....anyone else ??

When I swapped the tube in a 6100 it had some tape like that under the yoke. I don't know if it is required or not, but it seems to be a nice buffer for tightening the yoke enough to not move while helping prevent you from cracking the neck in doing so. So I put tape on the new one. I had some really similar bandage tape that I used.

 

[kentmurphy]

thanks guys ... note, the same tape is also inside the yoke ... any thoughts on that?

Kent

 

[Level42]

Like I mentioned in the first reply:

It looks like that tape is also holding the wiring in place. Definitely leave it there ! (Also for the reason VectorJunkie mentions...)

 

[kentmurphy]

ok ... thanks ... got to read more carefully ... I just discovered that the tape is more than tape ... under each strip is what appears to be a magnet ... I'll post a pic in a second ...

Kent

 

[Level42]

O wow, that's very interesting !!!

 

[kentmurphy]

here's a pic ... when removing the yoke, one of the pieces of tape remained stuck to the bottom of the tube .... you can see what appears to be a magnet ...

http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap5.jpg

 

[smalltownguy2]

DONT PULL UP ANY MORE TAPE!

Those magnets are assisting in convergence - if you remove them, you'll have a helluva time getting your convergence correct.

I've had those magnets fall out the second I pulled the yoke away from the tube before. They're a pain to put back in the right place if you're not careful.

The tape's not holding the wiring in place.

 

[kentmurphy]

thanks ... I think I can place the one that fell out pretty close to where it was in the yoke ... hopefully this will help and I won't struggle converging the monitor ...

Kent

 

[Level42]

See, already learned something....what I also learned is that my spare yoke is probably useless without these ?!?!?! O well, I hope to never need it

 

[kentmurphy]

I hooked everything up and applied power to the tube. The manual states to degauss the monitor before doing the purity adjustments. Looking at the pics below I would think it needs to be degaussed. Does anyone disagree?

http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap6.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap7.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap8.jpg
http://cid-4127ea3a33b50049.office....Arcade/machines/starwars/images/tubeswap9.jpg

Kent

 

[smalltownguy2]

I'd agree with that.

See here:'

http://mirrors.arcadecontrols.com/OscarControls/degauss/index.shtml

 

[docfrankie]

how in the heck are you keeping that tube still

 

[kentmurphy]

how in the heck are you keeping that tube still

The NOS tube came with cardboard packing that had a top and a bottom. I am using the cardboard bottom to keep the tube steady. If you look closely at the pics I posted previously you will see the cardboard. The tube itself is sitting on a table behind the cabinet. It's a nice setup because I can connect the wiring harness to the tube.

Kent

 

[kentmurphy]

Well, this project is on hold for a little while. I don't have a degaussing coil (stupid, eh?) and before I can move forward I need one. I tried to commandeer one in the local area, but no luck. I intend to purchase one tonight and once I get it I'll report back.

Kent

 

[komodo]

Couple things. Bolt the tube into an empty frame to prevent an - uh-oh followed by a bunch of cussing. You can make a degaussing coil out of an old degaussing coil from a dead monitor and a momentary on switch and a plug. Do a google for it. Degaussing coils to buy are about $25-30. Don't hold the switch in for a long time.