Advice sought for 1968 RCA GL-644W - Page 4 - Videokarma.org TV - Video

holmesuser01 · #46 07-15-2006, 12:53 PM

I wish it was that easy. If I could physically see the chassis, and handle it, I can most likely fix it. Hard to do when you are in another state... next door, but in a different state...

bgadow · #47 07-16-2006, 09:58 PM

I know there are at least a couple guys in the northern VA area; whether they could be talked into it is another thing. Calling Tony V!

Radiophile2001 · #48 07-17-2006, 08:27 AM

Holmes: Yes, it was probably a longshot on the phone thing! ;-) Thanks for the reply.

Bryan: Thanks. I'll keep checking to see if you find anyone interested in this area. Northern VA is definitely closer than Federalsburg, MD...although on some days with the traffic here on I-95, I wonder. PS. That station from your town on 107.1 (Oldies "The Duck") comes in pretty damn good here for the distance and signal strength. I'm a bit of an FM DXer and have some pretty decent radios for the hobby.

Carl

bgadow · #49 07-17-2006, 12:06 PM

Wow, that is a pretty good haul for "The Duck"! Thats one of the stations I listen to the most. I could give you a pretty good history of that station. I've been away from DXing for too long. I guess I shouldn't be too surprised since there are a number of DC stations that a good radio will pick up here.

Radiophile2001 · #50 07-17-2006, 03:19 PM

Holmes: You were right!

No bids at that price.

http://cgi.ebay.com/WORKS-Collectabl...QQcmdZViewItem

Radiophile2001 · #51 06-27-2007, 12:41 PM

Quote:

Originally Posted by holmesuser01

The 12HG7 is your video output tube. The 6GF7 is the vertical multivibrator/output tube. I still think that there are either solder bridges, or some bad connections somewhere. Best of luck to you.

[bump]

I think I'm ready to start messing with this set again......does anyone know what size/pin #'s of tube socket I should order for this tube? Going to try and replace the whole socket and see what happens....

"12HG7" Vertical output tube for CTC-38A Chassis (68 RCA)

I'll probably try to order it here:

http://www.tubesandmore.com/

Thanks!

roundscreen · #52 06-27-2007, 07:29 PM

The 12hg7 is the video output tube and has nine pins.
Ed

Chad Hauris · #53 06-27-2007, 10:59 PM

Yes, the 12HG7 is a 9-pin miniature base
(the larger 9-pin like used on the 6JE6 output tube is called a Novar base)

I would double check the socket...if it is not burned and is in one piece it is likely OK...more often the problem is microcracks in the solder attaching the socket to the board if the tube appears intermittent.

roundscreen · #54 06-28-2007, 07:14 AM

Quote:

Originally Posted by Chad Hauris

Yes, the 12HG7 is a 9-pin miniature base
(the larger 9-pin like used on the 6JE6 output tube is called a Novar base)

I would double check the socket...if it is not burned and is in one piece it is likely OK...more often the problem is microcracks in the solder attaching the socket to the board if the tube appears intermittent.

Chad.
What is the name of the base on the 6gf7 vertical tube. Would that be a novar base.
Thanks
Ed

Radiophile2001 · #55 06-28-2007, 09:25 AM

Quote:

Originally Posted by Chad Hauris

Yes, the 12HG7 is a 9-pin miniature base
(the larger 9-pin like used on the 6JE6 output tube is called a Novar base)

I would double check the socket...if it is not burned and is in one piece it is likely OK...more often the problem is microcracks in the solder attaching the socket to the board if the tube appears intermittent.

Thanks, both of you, for the info......yep, I had re-soldered all of the socket connections before to be sure that wasn't the problem....Now when I stick the tube in, there is a little bit of sparking going on with one of the pins.....the plastic is cracked and getting brittle.....does this seem like a socket issue itself now?

I remember when I put the new tube in that socket (along with all new other tubes) it performed like new for a few days. I think I had been maximizing all of the settings and making sure all the new tubes were fully in their socket and then the problems started. Had to jigger the 12HG7 just right for the set to work, then it just kept getting harder to "find that just-right position"....Then it just lost the picture and sound altogether. Now I have a dimly lit screen with no sound or reception--ironically just as it was before I replaced all the tubes....!

Any theories would be greatly appreciated......as I am an amateur in comparison to the AK mindtrust.

thanks

Radiophile2001 · #56 06-28-2007, 10:23 AM

Also, which of these 9-pin mini's would you recommend to fit this set?
Thanks.

SOCKET, 9 PIN CERAMIC, HIGH QUALITY
Top mounting tube socket. 7/8" chassis hole diameter, 1 1/8" mounting centers.

SOCKET, 9 PIN, MINIATURE, BELTON
9 pin miniature Belton socket. 1 1/8" mounting centers, fits 3/4" chassis hole.

SOCKET, 9 PIN, MINATURE, BAKELITE, BOTTOM MOUNT RING
Bakelite molded socket has bottom mount ring. 3/4" chassis hole, 1-1/8" mounting centers.

SOCKET, 9 PIN, MINATURE, SADDLE TYPE, PLASTIC
Phenolic top mount socket fits in a 3/4" chassis hole with 1-1/8" mounting centers.

SOCKET, 9 PIN, MINIATURE, CERAMIC
Top or bottom mounting ceramic socket fits in a 7/8" chassis hole and mounts with a ring on 1-1/8" centers.

SOCKET, 9 PIN, COMPACTRON, MOLDED SADDLE
Compactron socket for 6LQ6 tubes and others like it. NOS micalex socket is bottom mounting and fits in a 1" chassis hole. Mounting centers are 1-7/16".

SOCKET, 9 PIN, COMPACTRON, MOLDED
All molded sompactorn socket bottom mounts in 1-1/16" chassis hole, 1-5/16" mounting centers.

SOCKET, 9 PIN, MINIATURE, STANDOFF CERAMIC PC MOUNT
White ceramic PC mount socket.

SOCKET, 9 PIN, MINIATURE, PLASTIC, PC MOUNT
White plastic PC mount socket has 3/4" tail diameter.

SOCKET, 9 PIN, MINATURE, CERAMIC, PC MOUNT, GOLD PINS
PC mount ceramic 9 pin miniature socket. Gold pins.

SOCKET, 9 PIN, COMPACTRON, PC MOUNT
Socket rests on shoulder of contact tail, providing an air gap for cooling. For 1/16" circuit boards with bottom circuitry.

SOCKET, 9 PIN, MINIATURE, PC STANDOFF, BLACK
9 pin miniature, pc mount-standoff, black socket. 13/16" tail diameter.

SOCKET - 9 PIN PC MOUNT STANDOFF
Minature, PC mount stand off (Belton). 3/4" tail diameter.

SOCKET, 9 PIN, 3/4" CHASSIS HOLE, 1-1/8" MOUNTING CENTERS
Black plastic. 3/4" chassis hole, 1 1/2" mounting centers.

roundscreen · #57 06-29-2007, 11:35 AM

Best I can tell ya is get one that looks like this one with the crooked arrow pointing at it. {see picture}. Look around your parts chassis and you may find one that is in good shape.
Late 60,s color sets are cool.

bgadow · #58 06-29-2007, 11:51 AM

I'm thinking of a device called a socket-saver. Was this made for situations like this or just to save wear & tear on tube tester sockets? I've seen these but am just unclear on the idea.

Chad Hauris · #59 06-29-2007, 08:33 PM

The socket saver I don't think would work in this case. If the old socket is cracked and broken it can cause some of the contacts to be loose on the tube and a new socket should solve the intermittency. I would solder buss wire from each pin on the new socket back to the corresponding next solder joint on the PC board trace just to make sure you have a good connection.

Radiophile2001 · #60 07-01-2007, 09:14 AM

OK, not sure on the chassis hole and mounting center sizes offered from this store (www.tubesandmore.com), but it looks like this one will fit the set.
If I'm wrong, please do tell...!
;-)

thanks again.

"SOCKET, 9 PIN, MINATURE, BAKELITE, BOTTOM MOUNT RING
Bakelite molded socket has bottom mount ring. 3/4" chassis hole, 1-1/8" mounting centers."