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Old 5th May 2020, 02:45 PM   #111
paczeltf is offline paczeltf  Hungary
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ELEKIT TU-8800  SET AMP
Quote:
Originally Posted by transferfunction View Post
(...)
I understand that the ripple filter is still working however, there is now a constant low level 60hz hum out of both speakers after that initial shutdown.
If the plate voltage is too high and you hear hum then the FET may be dead already and what you measure is the unfiltered voltage coming from the smoothing cap.
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Old 7th May 2020, 04:09 AM   #112
vkung is offline vkung  Canada
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Son's TU-8800
Click the image to open in full size.29D6B85C-0FB8-4C20-914D-3C70D3A8A84A by vkmusic, on Flickr

Click the image to open in full size.4C3EEC08-0509-4F1C-B0BF-11E9482A2410 by vkmusic, on Flickr
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Old 9th May 2020, 05:54 AM   #113
transferfunction is offline transferfunction  United States
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Quote:
Originally Posted by paczeltf View Post
If the plate voltage is too high and you hear hum then the FET may be dead already and what you measure is the unfiltered voltage coming from the smoothing cap.

All three FETs are good. The ripple filter is not regulated, so the plate voltage varies depending on the AC line voltage. The amp appears to be designed for a nominal operating point of 115 volts. Standard US & Canada is 120v +/-5%, with many locations closer to 125 volts. It appears when the amp is run at this voltage in high power mode and driven close to rated power output, the ripple filter circuit shuts down. Even though the amp now functions following a power off and a few minutes later back on, there is a constant low level hum heard at both speakers.


Is 37mv of 60hz ripple on a 6550 output tube plate within spec? If so, then I could break out the O scope and attempt to locate the source of this hum.
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Old 9th May 2020, 05:55 AM   #114
vkung is offline vkung  Canada
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CHeck the SCR
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Old 9th May 2020, 06:02 AM   #115
transferfunction is offline transferfunction  United States
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Quote:
Originally Posted by vkung View Post
CHeck the SCR

Can you direct me to the component number(s) from the schematic Victor? I'm not seeing an SCR on it.
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Old 9th May 2020, 04:17 PM   #116
vkung is offline vkung  Canada
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Q102, Q202
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Old 10th May 2020, 02:00 AM   #117
vkung is offline vkung  Canada
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Just tested. Amp fired right up. Sounds amazing! You are right, tubes are the way to go. I will send you more pics later when the case is installed. Hope you are having a great weekend!

Last edited by vkung; 10th May 2020 at 02:03 AM.
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Old 10th May 2020, 04:20 PM   #118
vkung is offline vkung  Canada
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Son's upgrade
Vampire CU RCA
CU solderless binding posts

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Last edited by vkung; 10th May 2020 at 04:27 PM.
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Old 10th May 2020, 07:47 PM   #119
etinsley is offline etinsley  United States
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How can I place an order for one of these kits?
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Old 10th May 2020, 08:32 PM   #120
vkung is offline vkung  Canada
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send email to info@vkmusic.ca
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