Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Supplementary heat sink? posted by LtMandella on September 13, 2020 at 10:44:44:
First thing you want to do is have the amp serviced by a competant technician. Have him clean out the old silicon grease (thermal paste) from the output transistors and the mating site on the inside of the heatsink. Reinstall with plenty of new silicon grease. Then check the bias and adjust to spec. Bring it home and run it for an hour and then measure the temp with a digital thermometer. Install your chosen supplimental heat sinking device and measure again after an hour to see if you have a lower overall temp. If you can reduce the temp by 10-15 degrees thats plenty. I have serviced lots of those amps over the years and they do run hot. A complete service every couple of years as above will extend the life. Consider changing the output transistors as they are certainly stressed by now if they are the originals. Should not be too expensive but pay a little more to a real pro over a bargain fix by a cowboy. Nick Gowan at True Sound in Campbell California is highly thought of.
Edits: 09/14/20
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Follow Ups
- RE: Supplementary heat sink? - Basslines 21:45:21 09/14/20 (13)
- RE: Supplementary heat sink? - DDzStereo 04:11:48 10/02/20 (0)
- RE: Supplementary heat sink? - madisonears 15:22:15 10/01/20 (1)
- RE: Supplementary heat sink? - pictureguy 23:32:25 10/01/20 (0)
- Very sound advice. - Mike K 11:37:00 09/15/20 (7)
- Removing top cover... - Jonesy 12:08:15 09/15/20 (6)
- RE: Removing top cover... - Mike K 22:31:24 09/15/20 (3)
- RE: Removing top cover... - Jonesy 06:00:27 09/16/20 (2)
- Thank you, I now understand the reasoning ... - Mike K 08:37:08 09/16/20 (1)
- RE: Thank you, I now understand the reasoning ... - Jonesy 09:00:26 09/16/20 (0)
- RE: Removing top cover... - LtMandella 20:19:13 09/15/20 (1)
- RE: Removing top cover... - Jonesy 05:19:59 09/16/20 (0)
- RE: Supplementary heat sink? - LtMandella 08:35:01 09/15/20 (0)
- Thermal grease should always be applied sparingly - 13th Duke of Wymbourne 07:44:29 09/15/20 (0)