The amp is DONE!!!!! WHOO HOO!!!

chubs · Post by **chubs** » Wed Jun 04, 2008 7:29 am

Good luck finding Paxolin... I have been searching for a month... BTW Joe... if you decide to perf a redswirl ... wear gloves.... and keep the hell away from that red dust left over from drilling the holes... you will itch forever....

Rootz · Post by **Rootz** » Wed Jun 04, 2008 8:52 am

It's a stellar performance to let a board look like that. It not only is beautiful, but it's also how they made it back in the days. Looks teriffic!

Looks like drilling will be a lot easier when you've got a good template. I was thinking about one made out of rust free steel, that's pretty hard, so it will last for years without wearing out. I know a couple of companies with a CNC machine. I'm curious what the price would be for a template...

Now the question: what are the sizes of the board for JTM45/50's. Somewhere I read that the space between the holes measured from centre to centre is 1 centimeter (0.4"), is that correct?

Thanks for the help!

chubs · Post by **chubs** » Wed Jun 04, 2008 9:25 am

That is what I have. I got a local engraver with a cnc machine to make me a 1/4" plexiglass template with 1cm square holes... made a board last night and it worked like a charm... if you tape the template over the new board... and hold it loosly... the drill bit on the drill press will "grab" the hole and align it perfectly on it's own... Law of the least resistance...

Why do we love the look of perf board so much... I know my wife doesn't understand...

Rootz · Post by **Rootz** » Wed Jun 04, 2008 9:37 am

Are there women then that understand why we like building amps? Do they know why we like driving to fast? Or why we like drinking beer with our friends?

Oeps, here I go again...

Back to the topic. I just took some measurements of the board in my JTM45. Looks like the turrets are placed 9 mm out of each other. Now it's not really a problem that the turrets are placed differently, but when using George's chassis, the studs that hold the board in place will line out different too. How is that with the board you made? Does it line out corectly?

chubs · Post by **chubs** » Wed Jun 04, 2008 10:32 am

My chassis is a Ceriatone... I will probably drill holes in the chassis to fit. I need to mod the chassis anyways, I'm doing an Offset version ... but the chassis has the ears out... so I will cut them off and get my welder buddy to make corner triangles.

cole · Post by **cole** » Wed Jun 04, 2008 12:06 pm

Another shot in natural light...

Yes, the studs line up perfectly when mounted.

chubs · Post by **chubs** » Wed Jun 04, 2008 2:13 pm

Does anyone have the keystone.. or better yet the digikey # for those split turrets?

Ricky Lee · Post by **Ricky Lee** » Wed Jun 04, 2008 2:20 pm

chubs wrote:Does anyone have the keystone.. or better yet the digikey # for those split turrets?

George has the split turrets in Metro store.

Ricky Lee · Post by **Ricky Lee** » Wed Jun 04, 2008 3:15 pm

A few years back I purchased enough of the phenolic boards to do every style Marshall built. The phenolic boards are the hardest of the components to to get for the period correctness. But Marshall now has boards that are cosmetically identical to their early boards but of different material. Find out where they get their boards and that would remedy the need for phenolic. Nothing like a dark brown perf board, the red stuff just don't cut it for that vintage look.

cole · Post by **cole** » Wed Jun 04, 2008 3:31 pm

I remember a comment from Angus Young when he was asked about the prerequisite color for his SG's..."They can be any color as long as it's brown."

I believe the same applies for the boards. There's just something about a brown board that speaks to the vintage correctness and cosmetic appeal of a build.

I don't believe anyone who's building these amps with any level of finesse in build quality will want to use anything but Garolite, Paxolin, or Phenolic for materials.

There should be as much attention given to materials selection as is possible. If we ever see a perfect build (I mean absolutely PERFECT), we'll see a beautiful brown board peppered with NOS components superbly soldered to split turrets.

Now THAT turns my crank!!

Ricky Lee · Post by **Ricky Lee** » Wed Jun 04, 2008 4:22 pm

I've got some sheets of brown phenolic I purchased that is wider than the 66 plexi power board, that way I can make any of the plexi boards by just down sizing from there. The last sheets I purchased are 16th inch thick and work good for the Fender boards.

Krinkle · Post by **Krinkle** » Thu Jun 05, 2008 6:02 pm

Are the JTM spacings different from the '59? I just finished a 12 series and confirmed that they were 0.375" or 3/8". The holes lined up perfectly with George's chassis.

Darrin

cole · Post by **cole** » Fri Jun 06, 2008 7:03 am

3/8" spacing.

robert · Post by **robert** » Fri Jun 06, 2008 7:12 am

Cole is right, and 3/8" equals 9,525 mm.

Robert

Krinkle · Post by **Krinkle** » Fri Jun 06, 2008 10:10 am

Cole also confirmed that it was 0.375" for me in my thread, I just wanted to reinforce this for Rootz who said 0.4" above.

Thanks, Darrin