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Old 13th September 2012, 10:25 AM   #11
palmas is offline palmas  Portugal
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Just another thing: why use PCB? point-to-point wiring is so much better!
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Old 13th September 2012, 10:41 AM   #12
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Already have the PCB's and this is my first amp build. I thought it would make it easier.
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Last edited by nanchangbob; 13th September 2012 at 10:43 AM. Reason: spelling
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Old 6th November 2016, 07:08 PM   #13
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Default 4 in 1 tool

Most of my work is from DIYer's guitars and amps with issues from pickup/xfrmr polarity issues. Here is one of my builds, that defies explanation.

Will spill the beans with this simple tool. Power the amp up and czech the +/- of the xfrmrs.
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Last edited by engelheimer; 6th November 2016 at 07:20 PM. Reason: Doh!
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Old 7th November 2016, 01:15 AM   #14
Trajan is offline Trajan  United States
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Consider the weight distribution as well if you can. Nothing leads to dropped amps like all the weight on one side.
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Old 7th November 2016, 01:17 AM   #15
drlowmu is offline drlowmu  United States
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Hi,

I do NOT like the On-Off switch brought forward to the front, and in proximity of a Selector Switch. Avoid this !!

I like the Power Transformer tucked away in the left rear corner, as you drew it. Can you somehow locate the On-Off switch back there too?

I do NOT like the RCA input jacks in the rear vertical portion of the amp, requiring LONG wires to reach the selector and volume switches. TOO much chance for a degrade, of lowest level signals, in those long wire runs !!

I would have RCA jacks on the TOP of the amp chassis, right front corner or front middle area, so you can insert interconnects into the amp from any direction, and KEEP the lead length 2 inches or less, into the amp.

The choke, away from the power transformer is good, but do NOT let it crowd the Selector Switch, especially if its choke input, as the first filter element

Then, you have it !!

Jeff
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Old 7th November 2016, 10:49 AM   #16
DF96 is offline DF96  England
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Quote:
Originally Posted by nanchangbob
My chassis has holes cut in the back for IE and binding posts. I rotated the back piece so I can have the amps sit as a mirror image to each other.
Bad idea, IMHO. It guarantees that the two channels cannot be identical (e.g. stray capacitance), as you can't get mirror image valves. It may look nice, but the main purpose of an audio amplifier is not to look nice but to amplify.
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