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Old 17th August 2018, 03:14 PM   #51
blackwhaleamp is offline blackwhaleamp  Belgium
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Quote:
Originally Posted by avtech23 View Post
Hi Blackwhale
I didn't see any pictures attached to that post.
Have you tried swapping out tubes as well?
I noticed. I reduced the size of the images

Quote:
Originally Posted by avtech23 View Post
Have you tried swapping out tubes as well?
I tried, both the pre-amp and power-amp tubes.

I also noticed that when I play, and I plug and unplug the instrument there is the same PLAK coming. I wondered if all the issues are mechanical. I removed all the input jacks, and installed only one switfcraft jack. But the noise still coming. Now, I was wondering if by adding a cap at the input would solve the problem. I still need to try this.

My last option is to change the PT and/or the OT.
Attached Images
File Type: jpg IMG_20180812_183526.jpg (267.5 KB, 68 views)
File Type: jpg IMG_20180812_183531.jpg (244.4 KB, 69 views)
File Type: jpg IMG_20180812_183545.jpg (189.8 KB, 67 views)
File Type: jpg IMG_20180812_183555.jpg (885.6 KB, 62 views)
File Type: jpg IMG_20180812_183602.jpg (732.9 KB, 58 views)
File Type: jpg IMG_20180812_183718.jpg (144.1 KB, 10 views)
File Type: jpg IMG_20180812_183727.jpg (174.2 KB, 12 views)
File Type: jpg IMG_20180812_183733.jpg (144.1 KB, 13 views)
File Type: jpg IMG_20180812_183812.jpg (848.4 KB, 16 views)
File Type: jpg IMG_20180812_183836.jpg (210.4 KB, 17 views)
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Old 30th August 2018, 08:56 AM   #52
blackwhaleamp is offline blackwhaleamp  Belgium
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Quote:
Originally Posted by avtech23 View Post
Not sure if it is just the recording audio, but it sounds like something arcing(?).
Hi,

So, I changed the ground layout following the recommendations from the document that I attached here. I couldn't follow to the rule because I have this tank caps. It looks that the issue is gone I tried for a while and I haven't hear the arcing again.

However, in one specific configuration (Master around 7 and Volume around 8) there is an oscillation going on. I attached a video that shows the issue.

I added grid stoppers in every tube, but that does not removes the problem.

Any other suggestion that might help me to solve the problem?

Thanks a lot
Attached Files
File Type: mp4 VID_20180830_085325.mp4 (4.38 MB, 2 views)
File Type: pdf Grounding.pdf (610.7 KB, 4 views)
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Old 31st August 2018, 04:59 PM   #53
Malcolm Irving is offline Malcolm Irving  United Kingdom
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This might be a long-shot, but what about those inductors in the mid-control? Could they be picking up unwanted (mutual inductance) signal, from the output transformer for example? If you can shift their axis, it might be worth a try.
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Old 5th November 2018, 03:17 PM   #54
blackwhaleamp is offline blackwhaleamp  Belgium
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After months trying to fix this issue, I changed the OT and now the problem is gone. I still have the old one. How can I check that the transformer is damaged?
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