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FDP Forum / Amp Mods, Repairs, and Projects / The Official Tube Socket Clean and Retension Thread

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RussB
Contributing Member
**

Connecticut

a little out of tune
Jun 15th, 2006 07:25 PM   Edit   Profile   Print Topic   Search Topic

I use De-Ox-It and a pipe cleaners...then rinse with a burst of "CRC Electronic Cleaner"

sonicly duo

Canada

Tweed Champ - TURN IT ON & TURN IT UP!
Jul 18th, 2006 09:42 PM   Edit   Profile   Print Topic   Search Topic

Great posting. I printed off the steps and went off to my workshop with my guitar & amp and performed a successfull re-tensioning of the 6V6 socket in my tweed Champ with simply a jeweler's screw driver (after checking the caps were drained with a DMM of course).

I then plugged my guitar in to make sure nothing loosened in the car ride there, and noticed my workshop has a cool echo/reverb-like sound quality to it due to the size and concrete construction. It sounded cool...

Baxter Guitars

Down in Monterey

still giggin' after all these years
Jul 18th, 2006 11:52 PM   Edit   Profile   Print Topic   Search Topic

coincidence: just this week I did the pins on a Princeton that had been left out in someone's damp garage for years.
I sprayed a little DeOxit on the toothpick so's not to get oil all over.
PS: pipe cleaners can leave lint, which will burn and make more carbon traces.

jvstratman
Contributing Member
****

USA

Nursing grudges won't make em better!l
Jul 20th, 2006 06:40 PM   Edit   Profile   Print Topic   Search Topic

I discovered an alternative tool this evening with a little help from my better half. I asked her if she had any pipe cleaning type devices.

She gave me a heavy duty eyebrow defining tool.

It held up real good to a power & rectifier socket cleaning. I used Deoxit 5 followed by compressed air.

What impressed me is that the bristles retained their shape after a vigorous cleaning with the Deoxit.

It doesn't fit into the pin contacts of pre-amp tubes, but fits like a glove in the 8-pin sockets.

It's also handy for cleaning tube pins.

Power tube socket cleaner

(This message was last edited by jvstratman at 06:43 PM, Jul 20th, 2006)

jvstratman
Contributing Member
****

USA

Nursing grudges won't make em better!l
Jul 20th, 2006 06:42 PM   Edit   Profile   Print Topic   Search Topic

Better pic.

Pic 2

rockable
Contributing Member
**

USA/ NC/ Greensboro

A passion for making noise....
Jul 21st, 2006 06:33 AM   Edit   Profile   Print Topic   Search Topic

Great addition, jvstratman! Thanks.

pdjohnson

GB

Jul 21st, 2006 07:47 AM   Edit   Profile   Print Topic   Search Topic

Or you could do it like.....


THIS

Blue Strat
FDP Business Member

USA

Jul 21st, 2006 08:02 AM   Edit   Profile   Print Topic   Search Topic

>>>Sorry to harp on this issue, rockable, but I still don't see how putting the standby in "play" position achieves anything to drain the filter caps.>>>

Don't worry about it, it works. But, NEVER trust any discharge method without double checking with a meter.

While the tubes are still warm, the discharge path is through the standby switch, output transformer, and power tubes to ground. Probably a similar path (no OT though) through the preamp plate load resistors and preamp tubes to ground.

Mike K

KCA NOS Tubes & Amp Repair

(This message was last edited by Blue Strat at 10:54 AM, Jul 21st, 2006)

BobRuth
Contributing Member
**

The Houston area...

From The Houston Area
Aug 4th, 2006 08:24 AM   Edit   Profile   Print Topic   Search Topic

Just for the sake of discussion, if it helps your understanding, it might depend on what type of "standby" you have.

Some schemos have a standby that makes/breaks the ground for the center tap of the B+ windings on the PT. Others though, are after the rectification/filtering stage and actually make/break the B+ connection to the amplifier.

Especially in this latter case, in standby, the caps are disconnected and, unless there happen to be bleeder resistors, they will have no discharge path at all and will have a tendency to stay charged.

I have always liked a "pro-active" stance on discharging but that is just my personal preference:

1) amp unplugged
2) power switch on
3) standby switch to "play"
4) take a jumper and clip ground to any preamp tube socket plate pin. That will provide a discharge path that is somewhat "rate controlled" even if it is not so spectacular as the old "screwdriver across the filter cap" approach.


I like to leave that jumper on too. Sometimes those big electrolytics can re-charge themselves at least partially, if you take a minute to go to the can, make a pot of coffee or, put the work off until the next day. You can be in for quite a surprise.

This is why, though, there is an attempt to maintain balance between encouraging people to learn some of their own amp maintenance.... and...
constantly reminding them of the danger involved in certain areas.... this being one of them. Sometimes, it can be a little tricky making a procedure simple and generalized to the point where just anyone can do it. Often a little detailed knowledge of the circuitry involved can be extremely helpful.

(This message was last edited by BobRuth at 08:36 AM, Aug 4th, 2006)

Fender_Freak
Contributing Member

USA

Aug 4th, 2006 12:31 PM   Edit   Profile   Print Topic   Search Topic

Thanks for the time and effort you put into a very informative thread - much appreciated!

jazzguitar
Contributing Member

Delicious tone !

Looking for the perfect job
Aug 4th, 2006 01:41 PM   Edit   Profile   Print Topic   Search Topic

I would not use any type of brush to clean the socket contacts, as Baxter writes, they can leave fibers that burn to carbon traces and short out ... although there's one seller on ebay selling tube socket cleaning brushes, I'd like to try them. (Anyway make sure the center wire of the brush is not too large for the socket contact, I'm thinking of those cosmetic ones!)

Also I don't recommend any chemical to remove oxidation on the contacts: all those contacts usually are plated, either nickel, tin or silver. A toothpick for octal bases and a smaller wood pin (you can make out of a toothpick by sanding) for preamp tube sockets works best, just polishing off the corroded surface without leaving any residue in the socket. IMHO, as usual!!

mertzy
Contributing Member
*

North Jersey

Democracy Inaction
Dec 21st, 2006 02:06 PM   Edit   Profile   Print Topic   Search Topic

BTTT

Bobby12

Canada

Dec 21st, 2006 06:14 PM   Edit   Profile   Print Topic   Search Topic

to clean the socket of my amp. the 6l6 type ,i use contact cleaner and a small tooth brush the small verticl one we use, to go beteween the teeth

Bobby12

Canada

Dec 21st, 2006 06:22 PM   Edit   Profile   Print Topic   Search Topic

for the larger tubes like the 6l6 use a small verticul tooth brush,trim some off it fits perfect

rockable
Contributing Member
***

USA/ NC/ Greensboro

A passion for making noise....
Sep 14th, 2007 07:55 PM   Edit   Profile   Print Topic   Search Topic

Can't overemphasize the shutdown method. If you get used to working on PRs and Champs, you don't have to do it. Then, one day you're working on a DR, VR, etc and you forget to switch the power off and let it discharge itself and POW! All of a sudden, you're reminded again. It pisses me off every time I forget it, because I know better but I still do it every now and then.

Whiskey Rock-A-Roller

Thats what I am...

Women, whiskey, and miles of travelin'
Oct 21st, 2007 10:06 AM   Edit   Profile   Print Topic   Search Topic

So what's the verdict then?

Don't use de-oxit or contact cleaner?

I'm gonna try some alcohol and a tooth pick on my amp today. The hissing and crackling is drivin me up the wall...

We'll see what happens...

rockable
Contributing Member
***

USA/ NC/ Greensboro

A passion for making noise....
Oct 21st, 2007 10:10 AM   Edit   Profile   Print Topic   Search Topic

IMO, the deoxit and contact cleaner does a better job of getting oxidation off but it does leave a residue that will attract dust. I use Deoxit, others use alcohol. Try the alcohol and retension your octal sockets. Then you dedice. YMMV.

Whiskey Rock-A-Roller

Thats what I am...

Women, whiskey, and miles of travelin'
Oct 21st, 2007 10:15 AM   Edit   Profile   Print Topic   Search Topic

Yeah, I figured I'd try alcohol first. The amp's not THAT old, so I don't expect any serious oxidation.

If that don't work, I'll go get some De-oxit.

Dust shouldn't be a big issue should it? Once the tubes are back in, how would dust float up in there?!?

imjb1911
Contributing Member

Chicago

BFPR fan club member
Oct 21st, 2007 10:23 AM   Edit   Profile   Print Topic   Search Topic

I usually clip a jumper from ground to pin 1 of V1. This works well to dissipate any residual charge.

Quote from rockable:

"Can't overemphasize the shutdown method. If you get used to working on PRs and Champs, you don't have to do it. Then, one day you're working on a DR, VR, etc and you forget to switch the power off and let it discharge itself and POW! All of a sudden, you're reminded again. It pisses me off every time I forget it, because I know better but I still do it every now and then."

I had a few Champs Vibro Champs and PRs when one day I got my first DR. It was an all original '67. I couldn't wait to tune it up. I had the chassis upside down on a couple of 2x4s and laid my forearm on the bottom of the chassis as I stuck my dental probe into one of the sockets. After I got back up, I checked and found 280v on that pin. Good thing it wasn't 450v is all I could think of. Be safe.


Whiskey Rock-A-Roller

Thats what I am...

Women, whiskey, and miles of travelin'
Oct 21st, 2007 12:07 PM   Edit   Profile   Print Topic   Search Topic

"After I got back up, I checked and found 280v on that pin. Good thing it wasn't 450v is all I could think of. Be safe."


Checked mine before starting...

Did the ol' unplugged, standby on...

Made a cup of joe, and checked to find 0v at all pins...

Nice... It it only RI amps that discharge themselves?


Got her all done though,


And hey..... WAIT!!!

What's that sound coming from my amp!?!?!?!?!?



Why I think its:



NOTHING!!!!

Wow, I've never been so happy to hear nothing coming out of my amp.

Been puttin this off for the longest time, but now she's nearly dead quiet. Didn't have any alcohol around (thought I did) But just a tooth pick alone got a lot of crud out. May do it once more with alcohol or de oxit in a few months to get the remainder out. power tube sockets were QUITE oxidized.

Not a lot of retensioning to do. Only a couple sloppy ones.

Much better now!

With doing this, replacing pre amp tubes with Tung sol's and a Mullard PI, bright cap clip, and a Weber beam blocker, this is a whole different beast...

I think the only other thing in the works is some better Power tubes, and maybe a Weber 12F150 one day...

But for now, she sounds GREAT!

Previous 20 Messages   Next 20 Messages  

FDP Forum / Amp Mods, Repairs, and Projects / The Official Tube Socket Clean and Retension Thread




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