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FDP Forum / Fender Amps: Vintage (before 1985) / Fender Bandmaster blackface back plate help

stratcrazy

Ancona - Italy

Nobody knows I have the blues.....
Jan 7th, 2019 01:54 AM   Edit   Profile  

Hi, is there anybody could write down here the exact dimensions of the Bandamaster blackface (1966- no reverb) back plate? I need all the measures not only wide and height (I mean for example also the dimension of the upper short horns). I'd like to try to do it by myself. Thank you guys!

Cal-Woody

USA/California

Why do I keep fixing things that work?
Jan 7th, 2019 10:08 AM   Edit   Profile  

Look up Angela's amp repair. They specialize in Fender parts and amp plates.
Not sure where they are stationed but Fender replacement parts are their specialty!

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 7th, 2019 12:12 PM   Edit   Profile  

Angela is in Jessup, MD on Guilford Rd.

But you can draw your own pattern right now, very accurately.

Here's how:

Click the link and copy the image. Print it as large as you can in landscape on printer paper.

Next, measure the space between the amp cabinet's side panels where the back panel goes. It should be in the neighborhood of 22.25". Let's assume that's the dimension.

Subtract 1/4" from this to accommodate the Tolex over wrap on the ends of the panel. That allows 1/8" on each end, meaning the uncovered Masonite or plywood panel will be 22" wide.

Next, measure the width of the panel in the printed picture. Let's say it's 11 inches. Now do some simple math.

11 รท 22 = .5

Draw a grid of 0.5" squares over the printed picture.

Now you'll know exactly how tall the panel should be, as well as the dimensions and angles of edges and cutout features.

Tape together several sheets of paper and draw a grid of 1" squares. All that's left to do is copy the edge lines from the .5" scale grid to the 1" scale grid.



Click

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 7th, 2019 12:18 PM   Edit   Profile  

This guy gives a really good tutorial on scaling images using grids.

This is a really ancient method of up- and down-scaling. The Egyptians did it!

Look here.

Te 52

Laws of Physics

strictly enforced
Jan 7th, 2019 12:54 PM   Edit   Profile  

Peegoo's grid method is good, especially for enlarging complex shapes like guitar bodies from a photograph or drawing.

For simpler shapes like your back panel, I use a similar approach, but without grids: Decide on what size you want some dimension to be, say the overall width W. Print out the pattern to as large a scale as possible. Measure the equivalent dimension on the pattern, call that W'. Now calculate the scale factor F, which is the ratio W/W'. Save that F value.

To get *any* dimension on the real part, just measure the equivalent dimension on the pattern and multiply it by F.

This is all *much* easier if you do all your measurements in millimeters, that way you don't have to deal with fractions.

(This message was last edited by Te 52 at 03:06 PM, Jan 7th, 2019)

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 7th, 2019 01:17 PM   Edit   Profile  

Five out of every four people don't understand fractions :o)

stratcrazy

Ancona - Italy

Nobody knows I have the blues.....
Jan 9th, 2019 09:09 AM   Edit   Profile  

Thank you Peego for your kind help. I know well how to scale images and that's what I did with images I found out in the web. The problem is pictures were a bit distorted so I was not able to do a good scaling. Now I try with the link you posted. ;-)

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Jan 9th, 2019 01:10 PM   Edit   Profile  

Cheers!

If you've never done Tolex cabinet covering before, the best advice I can provide is to use a very sharp knife to make all your cuts as you trim and fold the material--especially on and around corners.

Don't overlap the material; make sharp cuts so the material meets edge to edge on the wood. This makes for a neat and pro-looking job.

Solvent-based contact cement is also the glue of choice for this stuff. You brush a light coat on both surfaces to be joined, wait about 10 minutes for it to tack up, and then stick it down. Work carefully here because you get one chance. Peeling it and trying again usually stretches the Tolex and ruins a nice clean fit.

But none of this is particularly difficult to do. Work slowly and carefully and you'll get pro results. It would help to watch a few how-to videos on YouTube.

Please keep us posted.

stratcrazy

Ancona - Italy

Nobody knows I have the blues.....
Jan 11th, 2019 11:56 PM   Edit   Profile  

Hi,I have scaled the image you posted and with the help of a friend of mine I draw with CAD a diagram of the backplate. Here's the link
https://drive.google.com/file/d/1Nwm9rxwhhH6UaDWIeiErIMGG-sjlhQAv/view?usp=drivesdk

Now I buy a 5mm thick plywood and find someone can cut it.

stratcrazy

Ancona - Italy

Nobody knows I have the blues.....
Jan 12th, 2019 12:15 AM   Edit   Profile  

Bad news! I checked better my cab and the backplate has to be 160mmm high, not 180 as my draw downscaled from the pic you posted. Maybe the pic is incorrect. Come from Mojotone web site? In this case Mojotone added an uncorrect picture.

pcalu

usa Thumb area Mi

Jan 12th, 2019 06:12 AM   Edit   Profile  

Just call Mojotone...

I just got a backplate for a 69 Bassman. Its perfect.

takes a couple of weeks cause they make them up from scratch

stratcrazy

Ancona - Italy

Nobody knows I have the blues.....
Jan 13th, 2019 01:10 AM   Edit   Profile  

Yes, that's what I'll do. I have to order some resistors and capacitors and I will do the same order. I expect crazy shipping costs (I live in Italy) but I have no choice.

FDP Forum / Fender Amps: Vintage (before 1985) / Fender Bandmaster blackface back plate help




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