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Old 26th September 2003, 12:07 AM   #21
EC8010 is offline EC8010  United Kingdom
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Splendid stuff! I'm particularly impressed by the coil winding machine.
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Old 26th September 2003, 07:01 PM   #22
JDeV is offline JDeV  South Africa
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Default Proposed 6072A Line amp

Some of my ideas on how to finish my amp. So far I build a prototype with junkparts, but am planning on how to build it and lay-out the parts. The top and rear will be from black chromed steel plate, with a satin finish. The sides possibly from a darker type of wood, wild cherry maybe.
Please advice on improvements.

Top:
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Old 26th September 2003, 07:03 PM   #23
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Front and rear:
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Old 26th September 2003, 07:24 PM   #24
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Won't you want more than one input? Do the components you're going to connect between the valves mean that they need to be spaced that far apart? You won't be able to see the volume setting when seated. A steel top plate might couple the leakage field from the mains transformer into the signal valves. They're all fairly minor points.
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Old 26th September 2003, 07:25 PM   #25
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Hi,

Quote:
Please advice on improvements.
Since you ask...

If possible I'd advise to mount the RCAs on the front, this way they and the attached interconnects:

a) don't disturb the nice look of the pre.

b) put much less strain on the cables.

Other than that it looks very good.

Cheers,
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Old 26th September 2003, 08:15 PM   #26
JDeV is offline JDeV  South Africa
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Quote:
Originally posted by EC8010
.....A steel top plate might couple the leakage field from the mains transformer into the signal valves. .....
What is better option for top ?

Thanx for other advice.

Quote:
Originally posted by fdegrove
b) put much less strain on the cables.
Good point, Frank
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Old 26th September 2003, 08:19 PM   #27
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You want something conductive, so that means a metal. You don't want it to be magnetic, so that excludes most steels (some stainless steel is non-magnetic, but it's tough to work). Aluminium is the most popular choice, followed by copper, and silver for the crazies.
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Old 26th September 2003, 08:29 PM   #28
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Hi,

I've used 3 mm thick circuit board for that, copperfoil side facing upwards, grounded and finished with sprayed on varnish.

Looks good, sounds good and is cheap...

If it needs to support somme heavy stuff such as xformers you may need to reinforce it from underneath to prevent sagging.

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Old 26th September 2003, 08:39 PM   #29
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Quote:
Originally posted by fdegrove
Hi,

I've used 3 mm thick circuit board for that, copperfoil side facing upwards, grounded and finished with sprayed on varnish.

Looks good, ....
You must post some of your pics here
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Old 26th September 2003, 11:00 PM   #30
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Default A run on 3mm copper-clad board

Quote:
Originally posted by fdegrove
I've used 3 mm thick circuit board for that, copperfoil side facing upwards, grounded and finished with sprayed on varnish.
Interesting idea, makes the "metalwork" much easier. Alternatively, you could use it foil side down, and use the foil as a ground plane.
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