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Old 11th September 2020, 11:20 AM   #21
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
The regulation for the rails is working. The 317/337 are fed from the rails so if that voltage is stable, their heating should be the same.
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Old 12th September 2020, 03:56 AM   #22
objext is offline objext  United States
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Did some further checking. After first turn-on I got the following:

LM317
In: 29.1V
Out: 14.5V
Adj: 13.4V

LM337
Out: -12.9V
In: -29.1V
Adj: -11.4V

Is there anything to learn from those numbers? I also noticed the solder joints look cold/cracked on the 317, and I'm getting a high frequency vibration from, I assume, the transformer when I first power it on. I didn't notice that before switching power supplies.

Last edited by objext; 12th September 2020 at 04:05 AM.
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Old 12th September 2020, 04:03 AM   #23
Perry Babin is offline Perry Babin  United States
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It's important that you post accurate numbers. The values for the 337 should all be negative.

High frequency vibration?

The values indicate that the regulators are a bit out of tolerance but it's not a big deal. For a healthy regulator the difference between out and adj will be 1.25v.
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Old 12th September 2020, 04:10 AM   #24
objext is offline objext  United States
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Corrected, sorry.

Vibration, coil whine perhaps? Here's a 5 second video. It stops as soon as the amp fully powers up.

September 11, 2020 - YouTube
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Old 12th September 2020, 04:11 AM   #25
Perry Babin is offline Perry Babin  United States
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I don't do videos. No exceptions.

Is the problem getting into the audio?

It's not likely with the mute delay.
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Old 12th September 2020, 04:23 AM   #26
objext is offline objext  United States
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No problem, I understand. I haven't tested the audio output in a while. I can check it tomorrow. I didn't notice anything before, however.
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Old 14th September 2020, 05:59 AM   #27
objext is offline objext  United States
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Audio output from all channels still seems fine at low volume, and you're correct that the whine stops before the mute delay lifts. I reflowed the cracked looking solder joints on the regulators, and also some similar looking joints on the output fets. Still getting plenty of heat from the regulators. My measurements were slightly different, but that may have been my meter battery was dying.

M317
In: 28.5V
Out: 14.2V
Adj: 12.9V

LM337
Out: -12.5V
In: -28.5V
Adj: -11.1V

Hard to believe this could survive in a hot car environment. This was taken with about 77F ambient with a light ceiling fan breeze
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Old 14th September 2020, 07:36 AM   #28
Perry Babin is offline Perry Babin  United States
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You are on the tab. If the tab is hotter than the heatsink, add some heatsink compound.

I don't know what's normal for these. There could be a load that heavier than it should be.

Are any of the op-amps running hot?
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Old 15th September 2020, 03:32 AM   #29
objext is offline objext  United States
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Yes, but I was getting similar readings off the back of the heatsink.

Q6, Q8, Q13 are definitely heating more than Q5, Q7, & Q12. About 125F compared to about 100F.

U202 is heating as much as 117F give or take, and similarly U402 next to it. It's difficult to get accurate readings. The other TL072 chips are getting warm also, but these are the hottest as far as I can tell.
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Old 15th September 2020, 03:56 AM   #30
objext is offline objext  United States
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I just noticed if I take a voltage reading off pin 1 or pin 2 of the TL494 I get the same coil whine as when the amp is powering up. Not sure if that's relevant but figured I'd mention it.
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