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PostPosted: Thu Oct 25, 2018 9:59 pm 
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After getting everything put together, was checking components and when I checked the inputs the meter indicated continuity to the chassis on both of the Bright inputs but none on the Normal inputs (except when testing ground connection on Normal). All 3 Bright connections for each jack (ground, hot and switch) indicate continuity. Have switchrd the fiber washers around and removed/isolated jacks from chassis. Any ideas what I'm doing wrong?

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PostPosted: Fri Oct 26, 2018 11:59 am 
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May have this figured out, but it involves removing the board. What a MPITA.

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PostPosted: Fri Oct 26, 2018 2:20 pm 
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Pulled board to see if there was any contact points with chassis. Everything was clear. So, if anyone is out there :hmmm: could you please advise why there was continuity (Hot and Switch tabs) on the Bright jacks and NOT the Normal. Have checked jumpers from pics and rechecked since I pulled the board. Have rechecked wiring for jacks. Have installed and reinstalled fiber washers. Can anyone advise me whether or not this is normal.

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PostPosted: Fri Oct 26, 2018 4:32 pm 
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Can you post a good picture? With isolated jacks and with no plug inserted, tip should be grounded. Only when a plug is inserted should you get continuity from tip to the 68K grid resistor. Both channels should behave the same way.

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PostPosted: Fri Oct 26, 2018 5:29 pm 
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Sorry, trying to get a picture posted. Thanks for replying so quickly

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PostPosted: Fri Oct 26, 2018 5:52 pm 
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Here are two from different angles


Attachments:
Tweed Amp 002.JPG
Tweed Amp 002.JPG [ 3.62 MiB | Viewed 5358 times ]

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PostPosted: Fri Oct 26, 2018 5:54 pm 
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here is the other one


Attachments:
Tweed Amp 001.JPG
Tweed Amp 001.JPG [ 3.55 MiB | Viewed 5358 times ]

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PostPosted: Fri Oct 26, 2018 6:39 pm 
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Stephen, disconnected the the star ground from chassis and there is NO continuity signal from Bright jacks now. I don't understand why there was no continuity on the Normal jacks, but there was on the Bright. Ground loop, maybe?

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PostPosted: Fri Oct 26, 2018 7:13 pm 
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Is it safe to put it back together?

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PostPosted: Mon Oct 29, 2018 10:08 am 
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With the ground disconnected, does it behave the same way? The channels are independent and should both work the same way if they are wired the same way.

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PostPosted: Mon Oct 29, 2018 6:07 pm 
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Both act the same with chassis ground removed

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PostPosted: Mon Oct 29, 2018 11:25 pm 
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Then they should act the same way when tied to ground. Put a jumper from chassis ground to the ground pont and what happens?

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PostPosted: Tue Oct 30, 2018 3:28 pm 
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OK. All jacks installed in chassis. Both Bright and Normal jacks (tip; hot, switch and ground lugs) test the same when chassis ground from jacks are removed; continuity from chassis to ground lugs ONLY. With chassis ground attached (ground closest to jacks), Normal jacks test with continuity from ground lug to chassis only, but Bright jacks (tip; hot, switch and ground lugs) indicate continuity to chassis. (Was checking to make sure jacks were still isolated from chassis).


Attachments:
Tweed Amp 039.JPG
Tweed Amp 039.JPG [ 3.63 MiB | Viewed 5300 times ]

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PostPosted: Tue Oct 30, 2018 6:55 pm 
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Found the problem. Bad solder joint on Switch lug of Normal-Hi jack. See picture in previous post.Thought I had corrected it , but have been concentrating on Bright jacks. Now, all jacks test the the same (grounded and ungrounded). Now for the scary part-VOLTAGES. Thanks for your patience. Hank S.

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PostPosted: Sun Dec 22, 2019 7:31 am 
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Hankules wrote:
May have this figured out, but assurance chien it involves removing the board. What a MPITA.

It was way too much fun! And it sounds great.


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