JCM900 Cabinet Restoration and Upgrade

This is what it sounds like, when cones cry.

Moderators: VelvetGeorge, BUG

User avatar
rgorke
Senior Member
Posts: 4509
Joined: Fri Feb 08, 2008 11:37 am
Just the numbers in order: 13492
Location: Drought Ravaged SoCal

Re: JCM900 Cabinet Restoration and Upgrade

Post by rgorke » Mon Oct 24, 2016 10:08 pm

"If you make a mistake, do it twice and smile and let people think you meant it." Jan Van Halen.

sixpakldp
Senior Member
Posts: 203
Joined: Thu Feb 26, 2009 12:02 pm
Just the numbers in order: 7

Re: JCM900 Cabinet Restoration and Upgrade

Post by sixpakldp » Sat Oct 29, 2016 5:46 pm

Any chance anyone has the baffle bracing for the inside of the cab? That's what I was looking for, the vertical member that is missing in modern cabs. The center post seems to be a 2x4.

Wattever
Senior Member
Posts: 139
Joined: Fri Mar 04, 2011 6:56 pm
Just the numbers in order: 7

Re: JCM900 Cabinet Restoration and Upgrade

Post by Wattever » Sat Dec 31, 2016 12:09 pm

I expect to be making one of those braces very soon. if you still need the dimensions, I can get them off my 66ish top handle cab.

Wattever
Senior Member
Posts: 139
Joined: Fri Mar 04, 2011 6:56 pm
Just the numbers in order: 7

Re: JCM900 Cabinet Restoration and Upgrade

Post by Wattever » Sat Dec 31, 2016 2:19 pm

Happened even sooner than I thought, so here goes...

Start by cutting a piece exactly 26 3/8" long by 3" wide.

13 1/8" from one end mark one edge, and draw a line to the opposite corner on the opposite end that you measured your 13 1/8 from. That should give you the right (correct)angle. Your board will end up being 3" wide on the first 13 1/8" on one end and then taper from there to 0 on the other end.

My old cabinet has what they call 1" (actually less than that) pine for that brace, and also for the 2 cross braces whereas the JCM800 I have has a single cross brace made of BB, so you'll have to notch around your cross brace.

My vertical brace mounts in the centre of the baffle, 1" from the bottom, and 1/2" from the top. if you want to get REALLY "correct" they drew lines 13 3/4 from each side of the baffle, and then did a pretty poor job of gluing and screwing the brace between the lines. :palm:

My 2X4 measures 1 3/4 by 3 3/4 and is notched around the bracing. you should be able to figure that out from various pictures.

It sounds complicated, but you should hopefully be able to make a brace from those instructions. :thumbsup:

If (when) it doesn't make sense, let me know and I’ll try to clarify. :scratch:

Post Reply