board standoffs

Talk about the evolution of Marshall's.

board standoffs

Postby David B » Fri Jan 17, 2014 9:57 pm

Anyone know what the original board standoffs measure & were they consistent over the years or all over the map?


bolt=

nut=

standoff tube=


thanks

db
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Re: board standoffs

Postby Stu » Sat Jan 18, 2014 1:55 pm

The hardware was 6BA. From memory, the standoffs were 1/2" tall and the screws usually 1 1/4". I should really let Neil answer, he always seems to have at least one in bits. :P

I used 1" screws for my 45/100 build because I couldn't find 1 1/4" 6BA and I didn't want to use metric stuff...
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Re: board standoffs

Postby David B » Sat Jan 18, 2014 4:07 pm

thanks Stu,

I had to look up the 6BA designation, oh there is a source for 6BA here..
http://www.britishfasteners.com/index.p ... steel-3695.

Looks like the standoffs Valvestorm offers about the same lengths as you stated...


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Re: board standoffs

Postby neikeel » Sat Jan 18, 2014 4:12 pm

Do you need any 6BAs?

I cleaned my local specialists out of the board length and the preamp socket size (also 4BA for output sockets, filter cap brackets and selectors and 2BA for trannies). They are all brass and I have plain and lock washers in excess. The brass nuts are nice at this side as they are the original solid type (not cheap stamped ones).

I am sure that I can find some spare for a build project if you are in need.

Stand offs are more of a pain. I ended up going to our local model shop (planes and trains - not the pink soft girly sort :roll: ) and bought some aluminium tubing and cut down. I am on my way home from work now (hopefully until tomorrow) so can measure up, I will also see how many 6BA I have left, I know I am running very low on both 4BA and 2BA.
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Re: board standoffs

Postby David B » Sat Jan 18, 2014 4:28 pm

Thanks for the offer, I just had good luck finding the #4 1-1/4"bolts at a local hardware store & mouser does have some keystone #4 standoffs that look correct in 1/2", 5/8" and 3/4" lengths. Just wasn't sure the original length on that part.

mouser part
http://www.mouser.com/ProductDetail/Key ... B3%252bpHe

My concern of board height is the power supply board on the early flanged chassis JTM45/100 is dang close to the screen grid pin on v6 so I might want that up a bit...

http://www.amparchives.com/album/Marsha ... _6174.html
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Re: board standoffs

Postby David B » Mon Jan 20, 2014 10:35 pm

Neil,

How long are the tubes you cut?

Thanks,
David
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Re: board standoffs

Postby Stu » Fri Jan 24, 2014 5:14 pm

If you get the power supply board tight against the switches there'll be more space around the octal sockets. If you use Castelco or similar switches, that will help; Carlings have the terminals on the back so with those you'd have to shift the power supply board back towards the sockets.

I used 1/2" spacers and Castelco switches in mine. There's plenty of clearance on the valve sockets.

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Re: board standoffs

Postby David B » Sat Jan 25, 2014 10:31 am

SCHwing..Stu very nicely done with nice old parts, where do you guys get all this stuff?

The Carling I have the terminals on the top so not in the way, similar to the Castelco which look cool in there BTW ...

What chassis are you using? I noticed the early flanged chassis such as the infamous 7026 tend to have the board toward the octals and the block chassis boards are more centered.

How many nuts do you use to hold the 1/2" standoff ? the 1/2" standoffs from Valvestorm utilize two nuts giving a total of 18mm if used with the lock washer in the kit...
http://i270.photobucket.com/albums/jj10 ... 9262ca.jpg

I could consider drilling new mounting holes in the chassis to center the board better, plenty of wiggle room to do this..



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