Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old October 17th 18, 12:54 AM posted to sci.electronics.repair
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Default Harman Kardon 930 lost channel. Hoe to trouble shoot ?

wrote:



What I consider the better TO-3s are aluminum, not steel.



** Though once common, Aluminium TO3 paks are no longer used by most manufacturers due to problems with thermal expansion of the aluminium base causing microscopic cracking of silicon chips.

Thermal expansion of aluminium is about 7 times greater than that of silicon, limiting the number of full thermal cycles such devices were good for.

https://www.engineeringtoolbox.com/t...als-d_859.html

Steel and copper alloy packs are used instead, with most having a "coin" made of a metal with intermediate rate of expansion soldered between the chip and the pak.



Another advantage is that they won't bend as much if the mounting
surface is not perfectly flat.


** Yuck. Better use only flat heatsinks.




..... Phil

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Old October 23rd 18, 03:01 AM posted to sci.electronics.repair
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Default Harman Kardon 930 lost channel. Hoe to trouble shoot ?

On Monday, October 8, 2018 at 12:28:00 PM UTC-4, wrote:
here is a tip,

wire an outlet box with a duplex outlet and a switch.

wire the outlet so the two outlets are in SERIES and in series with the switch..

Plug your unit into one outlet and plug a 100 Watt INCANDESCENT light into the other outlet.


I wonder what it takes for a guy to find a house where all the 120v outlets are wired like that.
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Old October 23rd 18, 04:29 AM posted to sci.electronics.repair
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Default Harman Kardon 930 lost channel. Hoe to trouble shoot ?

On Monday, October 22, 2018 at 9:01:53 PM UTC-5, wrote:
On Monday, October 8, 2018 at 12:28:00 PM UTC-4, wrote:
here is a tip,

wire an outlet box with a duplex outlet and a switch.

wire the outlet so the two outlets are in SERIES and in series with the switch..

Plug your unit into one outlet and plug a 100 Watt INCANDESCENT light into the other outlet.


I wonder what it takes for a guy to find a house where all the 120v outlets are wired like that.


Make sure there is a plug on it, do not wire it to the house wiring. Very against code.


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