Re: Chassis Design

in article 1192377317.147280.76250@xxxxxxxxxxxxxxxxxxxxxxxxxxxx, Peter Wieck
at pfjw@xxxxxxx wrote on 10/14/07 11:55 AM:

On Oct 10, 2:24 pm, Jon Yaeger <jon...@xxxxxxxxxxxxx> wrote:
in article RU7Pi.134297$BW4.113...@xxxxxxxxxxxxxxxxxxxxxxxxx, Ian Iveson at
IanIveson.h...@xxxxxxxxxxxxxxxx wrote on 10/10/07 1:24 PM:





Bret wrote

I was just fixing an old solid state Heathkit grid dip
meter and
realized it has what would make a fine chassis design for
tube amps,
with somewhat (!) different dimensions.

Get a length of aluminum angle extrusion, with one side
substantially
longer. Cut it in half, and make a matched section. Cut
back the edge
of each upward on the side facing you, and you have a
tray, so to
speak.

If you can only get L-section, you can do this with a
center plate
and weld or rivet each side to it.

This can be covered with one piece of bent (plate or ***
brake)
metal and will ahve a top, 90 degrees in back and a 45
degree face, to
the user, for jacks and knobs and such. The identical
cross section in
fact to the old Mc amps, except the 30 which has a
straight front and
back, i.e. a box.

The Heath GDO is here:
http://www.slack.com/images/TE/HeathHD-1250.jpg

You can see if you look the bottom is built from two
lengths of
identical L-section material and trimmed at one corner. We
want a
different width so need to weld a center plate or rivet it
with real
rivets (i.e. bucking bar and rivet gun). No pop rivets.

Morgan Jones suggests using U-section aluminium for the
sides, with the hollow section facing outwards. Top and
bottom are screwed-on *** or plate. Rectangular section
pillars are screwed on at each corner, to which front and
back plates are screwed. The resulting side recesses makes
for easy lifting.

Ease of lifting is of increasing importance. After tearing a
tendon in my arm, I'm considering putting push-chair (baby
carriage?) wheels on my power supply.

I know you guys like to use transmission pans, old ashtrays, etc. for your
projects (may Fred rest in peace) -- but if you've spent a lot of time and
money on the components and want to showcase your effort instead, check out:

http://www.yaegeraudio.com/

Yup. Shameless commercial plug.

Jon- Hide quoted text -

- Show quoted text -

Nice chassis... Does the $119 unit come with the cage? Cats and grand-
kids make that a basic requirement.

Peter Wieck
Wyncote, PA



Thanks, Peter.

No, the cage was an add-on. I'm out of stock on the cages . . . But have
plenty of the chassis.

Jon

.