MarshallForum.com
 
Go Back   MarshallForum.com > The Amps > Marshall Amps
LIKE MarshallForum on Facebook FOLLOW MarshallForum on Twitter
  
Like Tree4Likes
  • 1 Post By thrawn86
  • 2 Post By American Viking
  • 1 Post By FFXIhealer

Reply
LinkBack Thread Tools Display Modes
Unread 11-08-2009, 04:18 PM   #1 (permalink)
Junior Member
 
Join Date: Nov 2009
Posts: 3
Problems with jack plate on 1960 lead cab

i have a marshall 1960 lead cab and the imput jack is crapping out on me.

i have to bend and apply pressure on the cable for it even produce a sound. its not the cable because ive tryed 3 different ones.

is this a fixable problem or do i have to replace the entire jack plate its self
ampbassist is offline   Reply With Quote
Alt Today
Marshall Amps

Beitrag Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on MarshallForum.com
   
Unread 11-08-2009, 06:57 PM   #2 (permalink)
Senior Member
 
Join Date: Aug 2009
Posts: 7,674
Re: Problems with jack plate on 1960 lead cab

You can take the back off of the cabinet, but don't pull it away too quickly, because you'll have to unscrew the jack plate and feed it through the hole on the rear panel. After you do that, look for bent pins and solder that's cracked/missing. You should also check all the speaker connections while you're in there. If it needs some solder, you might be able to do that yourself, but if the jack is shot, they aren't too pricey to replace either.

Hope this helps.....
__________________
-Martimus Maximus Tone Packs - MHD Pickups - OFA Pedals-
thrawn86 is offline   Reply With Quote
Unread 11-08-2009, 08:38 PM   #3 (permalink)
Senior Member
 
American Viking's Avatar
 
Join Date: Jan 2009
Location: RICHMOND, VIRGINIA
Posts: 4,047
Re: Problems with jack plate on 1960 lead cab

It sounds like the life scorpion is about to sting the hell out of you...

I gotta fill you in on a couple things, first off...

Running an amplifier with no load connected is severely damaging to the output transformer. If you are not getting sound out of the cabinet and the input is bad, then you can't just jiggle it to get it to work, every second that the signal is not under a complete path your output transformer is shorting and frying.

Second, I hope when you swapped cables you are only using speaker cables and not instrument cables. Speaker cables are a thicker gauge that is meant for transferring current as instrument cables are thinner and cannot handle it. This again, severely damages the amplifier

Third, we need to know if you have a single input or if you have the MONO/STEREO input jack.

Either way, your solution is simple...
If it is the single input jack, just replace it. If it is the MONO/STEREO jack, then I would recommend taking the PCB out and hard wiring it for 16ohms and only use a single input. If it is the MONO/STEREO jack you will have to rewire all the speakers too, but this is really simple and you can do it without any tools. You will need a soldering iron to at least make the final connection to your input.

Wiring a 4 X 12 Speaker cabinet
Here's all the wiring diagrams you should need.

I highly recommend you do some research on matching impedance because this is also vital to the life of your amp. Based on what you said earlier I'm thinking you may not know the importance of this.

Let us know how it goes and I'll try to take care of any more questions you might have. Hope you don't think I sound rude because I'm not trying to be, these amplifiers aren't toys and unfortunately no one tells us everything we need to know when we purchase them.
American Viking is offline   Reply With Quote
Unread 11-08-2009, 09:11 PM   #4 (permalink)
Junior Member
 
Join Date: Nov 2009
Posts: 3
Re: Problems with jack plate on 1960 lead cab

American viking -

hey thanks for your reply

its a mono/stereo jack.

i took it apart to check for solder cracks like thrawn suggested and it was wierd, when i took the cab apart and tryed getting sound of the speakers, it worked fine on stero on 16ohms but nothing from the 8ohms imput, either on mono or stereo.

but when i put the cab back together then it stopped working. it was wierd, like the jack itself was not reaching the imput all the way, i check to make sure everything was tight as far as screws holding the jack plate in place and the wires were assembled correctly by useing the wiring digram you sent and it was correct.

so once again im unsure

if you have any other ideas of if you think i should just go ahead and rewire the cab to a single imput at 16ohm please let me know, i would hate to have to buy another cab.
ampbassist is offline   Reply With Quote
Unread 11-08-2009, 09:43 PM   #5 (permalink)
Senior Member
 
Adrian R's Avatar
 
Join Date: Jan 2009
Location: Far North Chicago Burbs'
Posts: 3,637
Re: Problems with jack plate on 1960 lead cab

Quote:
Originally Posted by ampbassist View Post
American viking -

hey thanks for your reply

its a mono/stereo jack.

i took it apart to check for solder cracks like thrawn suggested and it was wierd, when i took the cab apart and tryed getting sound of the speakers, it worked fine on stero on 16ohms but nothing from the 8ohms imput, either on mono or stereo.

but when i put the cab back together then it stopped working. it was wierd, like the jack itself was not reaching the imput all the way, i check to make sure everything was tight as far as screws holding the jack plate in place and the wires were assembled correctly by useing the wiring digram you sent and it was correct.

so once again im unsure

if you have any other ideas of if you think i should just go ahead and rewire the cab to a single imput at 16ohm please let me know, i would hate to have to buy another cab.


**I just experienced a similar situation with my 1960 cab. The solder joints that connected the receptacle pins for the jack wires had broke, and if pushed upon came free from the jack/plate pcb board. Although it was not creating an issue at that moment I could see that it would in the future. For me it was an easy fix as I just reiforced those solder joints with fresh solder.

It sounds as if the actual switching mechanisim on that plate has failed, and even you can do what AV suggests, the easiest thing to do probably is just replace that entire jack/plate assembly. They cost about $50.00.

In the meantime I certainly would not attempt to use that cabinet untill its fixed! AV is absolutely right about the abuse a zero load is on any tube amplifier...
__________________
99' Marshall JCM 2000 Dual Super Lead 100 w/mods
00' Marshall JCM 2000 DSL 100 w/mods
05' Marshall 1960 4x12 V30s/GK85s
85' Marshall 1960 4x12 V30s/GK85s
06' Marshall MG-15 mini-stack..w/G10 Vintage/G10 GB
95' Gibson LP Standard
14' Gibson SG Standard
00' Gibson Flying V98
06' Gibson 67'RI Flying V
00' Guild DV-6

*Some* hearing loss?
Adrian R is online now   Reply With Quote
Unread 11-08-2009, 10:24 PM   #6 (permalink)
Senior Member
 
American Viking's Avatar
 
Join Date: Jan 2009
Location: RICHMOND, VIRGINIA
Posts: 4,047
Re: Problems with jack plate on 1960 lead cab

Quote:
Originally Posted by ampbassist View Post
American viking -

hey thanks for your reply

its a mono/stereo jack.

i took it apart to check for solder cracks like thrawn suggested and it was wierd, when i took the cab apart and tryed getting sound of the speakers, it worked fine on stero on 16ohms but nothing from the 8ohms imput, either on mono or stereo.

but when i put the cab back together then it stopped working. it was wierd, like the jack itself was not reaching the imput all the way, i check to make sure everything was tight as far as screws holding the jack plate in place and the wires were assembled correctly by useing the wiring digram you sent and it was correct.

so once again im unsure

if you have any other ideas of if you think i should just go ahead and rewire the cab to a single imput at 16ohm please let me know, i would hate to have to buy another cab.
If it is a 1960 cab there is no 16ohm Stereo input. It is 4ohms Mono on the left, 16ohms mono on the right and when switched to stereo both sides are 8ohms and each jack only controls two speakers. Mono uses all four. You never need to use stereo unless you are hooking two amplifiers to the same cabinet.

Your head must be matched to your cabinet. If the cabinet is set to 16ohms, the head must be at 16ohms, and so on and so on. This only changes if you add more cabinets. You must match the impedance.

This leads me to believe if you have a DSL100 or newer Marshall head, some will shut down and not send signal or current when the impedance is mismatched.

Do you own a multimeter? You can verify the jacks on the cabinet and see exactly what is wrong with it.

The Cliff jacks in the cabinet do no usually go bad, there is usually a problem with the switch failing or cracks in the PCB.

I would recommend just hardwiring it for one 16ohm input. Even for this, I also recommend having and being able to use a multimeter to check behind yourself. You can verify the impedance after you are finished the wiring to make sure you didn't miss something like accidentally crossing a + or - wire or something. Wiring a cabinet and using a multimeter are super easy and the tools you need are cheap.
American Viking is offline   Reply With Quote
Unread 11-08-2009, 11:17 PM   #7 (permalink)
Senior Member
 
Join Date: Aug 2009
Posts: 7,674
Re: Problems with jack plate on 1960 lead cab

Almost sounds like something's up with your wiring. If you pull the back off, plug in, and everything works right, and then it won't when you put it back together, it sounds like a wire is broken or shorted. Definately DON'T use it until you find the culprit, or buh-bye amplifier.
__________________
-Martimus Maximus Tone Packs - MHD Pickups - OFA Pedals-
thrawn86 is offline   Reply With Quote
Unread 11-09-2009, 09:25 PM   #8 (permalink)
Junior Member
 
Join Date: Nov 2009
Posts: 3
Re: Problems with jack plate on 1960 lead cab

thanks for your reply guys, i think i may just replace the entire jack plate, sounds like one the easier ways to handle this.

i dont know if it makes a difference but im actually useing a valvestate vs-100 head
ampbassist is offline   Reply With Quote
Unread 02-12-2010, 10:58 AM   #9 (permalink)
Junior Member
 
Join Date: Feb 2010
Posts: 1
Re: Problems with jack plate on 1960 lead cab

I have a 1960A cab that is having problems. When i plug my JCM900 head in, it only works if i set the plate switch to stereo and plug into the right jack. Even then, only the right side of the cabinet produces sound. When set to mono, i get no sound and when set to stereo and plugged into the left jack, i get no sound. I'm guessing i need to replace the jack plate, but if anyone can think of another solution, it would be apprecaited.
JONdoTCON is offline   Reply With Quote
Unread 03-03-2012, 12:26 PM   #10 (permalink)
Junior Member
 
Join Date: Mar 2011
Posts: 4
Re: Problems with jack plate on 1960 lead cab

Just bend socket plates strips, so you get 8 and 16 ohms in mono setting.
Attached Images
File Type: jpg Image002.jpg (100.8 KB, 27 views)
Makerock is offline   Reply With Quote
Unread 03-24-2012, 08:27 AM   #11 (permalink)
Senior Member
 
American Viking's Avatar
 
Join Date: Jan 2009
Location: RICHMOND, VIRGINIA
Posts: 4,047
Re: Problems with jack plate on 1960 lead cab

Resurrecting an old thread...

Chances are nobody is using anything but one setting on the jack. Best solution is to remove the PCB and hard wire the cabinet to 16ohms. As long as you know how to make a strong solder joint there will be no more problems.
Ken and frogbreath like this.
American Viking is offline   Reply With Quote
Unread 03-24-2012, 08:42 AM   #12 (permalink)
Ken
Senior Member
 
Ken's Avatar
 
Join Date: Feb 2009
Location: Arlington Heights, IL
Posts: 8,535
Re: Problems with jack plate on 1960 lead cab

Quote:
Originally Posted by ampbassist View Post
i dont know if it makes a difference but im actually useing a valvestate vs-100 head
That means an open load is okay; at least you weren't damaging the amp while it was in failure mode.

Ken
__________________
1999 Marshall DSL 50
Music Man 65 Reverb late 1970's (?)
Late 1970's (?) Fender Champ
Marshall battery amp
1980 Model 1982A 4x12 cabinet G12H-80's 444 cones
1983 Model 1982B 4x12 cabinet G12-80's 444 cones
PRO 4x12 from the 1970's
Woodson 2x12
1976 Les Paul Standard
Epiphone Les Paul knockoff
ESP Lawsuit Explorer
1979 Chiquita Travel Guitar
1995 Taylor 310
Ken is offline   Reply With Quote
Unread 03-24-2012, 10:48 AM   #13 (permalink)
Senior Member
 
FFXIhealer's Avatar
 
Join Date: Nov 2011
Location: Lake Charles, LA
Posts: 1,614
Re: Problems with jack plate on 1960 lead cab

There are places you can get them new.

Guitar Nucleus Guitar Parts - Marshall Amp Parts
frogbreath likes this.
__________________
2007 Marshall JVM410H + 1960A Lead
2011 Fender Mustang V + V412
2010 Fender Mustang II
1985 Marshall Lead 12 3005 Microstack
2012 Marshall JTM1H
2012 Marshall JMP1H
2011 Gibson Les Paul Custom Silverburst
2012 Gibson SG Special Faded
2009 Fender American Special Stratocaster
2007 Hagstrom Ultra-Swede
Custom Warmoth Strat with S/D pickups
FFXIhealer is offline   Reply With Quote
Unread 05-12-2013, 06:08 PM   #14 (permalink)
Junior Member
 
Join Date: Mar 2013
Posts: 3
Re: Problems with jack plate on 1960 lead cab

I had the exact same problem with a 1960 Lead cab... (like yours) mine also has the stereo/8/16 ohm jack plate... It was cutting out at gigs and I noticed that if I wiggled the cord where it plugs into the jack it would cut in/out... I taped it over to one side to finish the show. the following week, when I had time to remove and inspect the jack this is what I found... the traces on the circut board had hairline cracks where the edge of the input jack solder joint thins out into the foil trace... one fix could be to solder back over it, but this is not good enough for me. (like your other reader suggested) i hard wired my cab to 16 ohm mono, and that's the cheapest and most reliable fix.. (getting off topic) we thought we liked having a stereo cabinet around because somewhere around here there is a rack mounted JMP tube pre and 9200 el34 dual monoblock power amp, and I thought someday we may want to use it with a single stereo 4x12 cab, but it never happens, rack mounted rigs are kinda like trying to re-invent something for no practical reason.
Attached Images
File Type: jpg old superlead.jpg (3.4 KB, 5 views)
SmokinDaveWolfe is offline   Reply With Quote
Unread 05-12-2013, 06:22 PM   #15 (permalink)
Senior Member
 
Dogs of Doom's Avatar
 
Join Date: Aug 2012
Location: Los Angeles
Posts: 7,229
Re: Problems with jack plate on 1960 lead cab

I use mine in stereo w/ my EL34 50/50 & it works flawlessly. The guy that had it before me, toured hard w/ it. He switched the plastic nut on the 16ohm input to a beefy metal one & hadn't had any problems w/ it. He used it w/ a 900 @ 16ohm.

I use the 16ohm in when I'm not using the stereo setup.
__________________
My 2...


Dogs of Doom is online now   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:13 PM.


Find us on Facebook!   Follow us on Twitter!

Our Network: PRS Guitar Forum | Luthier Forum | SG Guitar Forum | Les Paul Forum | Music Gear Forum | 7 String Guitar Forum | Acoustic Guitar Forum

MarshallForum proudly supports St. Jude Children's Research Hospital

Copyright © 2005-2014, MarshallForum.com. All Rights Reserved.