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Old 1st April 2012, 08:35 AM   #101
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Ok. Got on a roll tonight and got some more stuff done.

Top view. Drilled and tapped holes for the PSU PCB. Also soldered all the wires to it. Not sure how the final assembly will go yet...
Click the image to open in full size.

Mock up of where the power wires will go.
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With the plexiglass top in place.
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So sleepy. Tomorrow, hoping to get the rear panel drilled for the speakon jack, rcas, and maybe the speaker posts if I can find some. Could even get to testing the boards! Kinda scared though. Need to build a bulb tester first I guess.
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Old 1st April 2012, 09:40 AM   #102
AndrewT is offline AndrewT  Scotland
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have you tested the transformer wiring up yet?
Follow that by adding on the PSU.

Then test one amplifier. Then test the other amplifier.
Second to final test the whole assembly before you start putting it in a box.

Finally assemble the boxed version exactly replicating the electrical wiring that you know works silently on the bench.
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Old 1st April 2012, 09:52 AM   #103
Puffin is offline Puffin  United Kingdom
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Originally Posted by oneplustwo View Post
Holes tapped, boards attached.

Click the image to open in full size.

Also bought some glossy letters that will go on the front. They're 2" tall. A little fancy for my usual tastes, but I thought I would try to go a little outside my typical tendencies.

Click the image to open in full size.

Next... fabricate the other four sides of the enclosure.
Where did you get those letters! I want some for my F2
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Old 1st April 2012, 02:05 PM   #104
6L6 is offline 6L6  United States
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Quote:
Originally Posted by AndrewT View Post
have you tested the transformer wiring up yet?
Follow that by adding on the PSU.

Then test one amplifier. Then test the other amplifier.
Second to final test the whole assembly before you start putting it in a box.

Finally assemble the boxed version exactly replicating the electrical wiring that you know works silently on the bench.
That is the best advice that has appeared in this thread.

Test just the PSU, then, with no amp boards attached connect the PSU in your heatsink chassis and make sure that is doing what you expect. Then attach the amp boards one at a time.
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Old 1st April 2012, 04:03 PM   #105
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Sign Letters / Wooden Letters / Plastic Letters / Metal Letters

I got the powder coated aluminum ones:

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Where did you get those letters! I want some for my F2
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Old 1st April 2012, 04:21 PM   #106
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Thanks for the tip. That was going to be my methodology pretty much. As a matter of fact, the transformer wiring is good through the pair of caps in the PSU box already. I've read the amp board setup process a couple times so hopefully that goes fairly well.

One question for this set of boards. I think I know this... but can someone confirm where I measure to make sure the trim pots are installed correctly (i.e., in the correct orientation)? Or more importantly, make sure that their initial setting is where it's supposed to be at zero. (Can you tell I'm paranoid about this one?)

Also, how do folks connect the PSU wires to the boards? Should I just solder one in and then test and then solder the other one in? That doesn't let me test independently so I was thinking about using some kind of connector.

Quote:
Originally Posted by AndrewT View Post
have you tested the transformer wiring up yet?
Follow that by adding on the PSU.

Then test one amplifier. Then test the other amplifier.
Second to final test the whole assembly before you start putting it in a box.

Finally assemble the boxed version exactly replicating the electrical wiring that you know works silently on the bench.
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Old 1st April 2012, 04:40 PM   #107
AndrewT is offline AndrewT  Scotland
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set the bias adjuster to the wrong end and the bulb will light up.
Just swap it to the other end and the bulb will go out.
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regards Andrew T.
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Old 1st April 2012, 04:48 PM   #108
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Quote:
Originally Posted by oneplustwo View Post
Thanks for the tip. That was going to be my methodology pretty much. As a matter of fact, the transformer wiring is good through the pair of caps in the PSU box already. I've read the amp board setup process a couple times so hopefully that goes fairly well.

One question for this set of boards. I think I know this... but can someone confirm where I measure to make sure the trim pots are installed correctly (i.e., in the correct orientation)? Or more importantly, make sure that their initial setting is where it's supposed to be at zero. (Can you tell I'm paranoid about this one?)

Also, how do folks connect the PSU wires to the boards? Should I just solder one in and then test and then solder the other one in? That doesn't let me test independently so I was thinking about using some kind of connector.
zero your pots by measuring ohms across R3 & 4

cheers Woody
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Old 1st April 2012, 06:05 PM   #109
6L6 is offline 6L6  United States
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They are genuine Bourns pots, yes? Start with them fully CCW
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Old 1st April 2012, 06:14 PM   #110
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Quote:
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They are genuine Bourns pots, yes? Start with them fully CCW
Yes, Bourns. The confusion is whether I installed backwards or not.

Weird. When I measure across the resistors, the values slowly rise till I get an open circuit. Is that a problem with my cheapo DMM?
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