| part substitute problem [message #15851] |
Tue, 14 June 2011 00:24  |
ampcabinets
Messages: 10
Registered: August 2010
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Junior Member |
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After reviewing the list for part substitution, I need to know a thing or 2.
In sub'ing an NTE129 for the 38737 and NTE128 for the 38736 drivers, on my board.... the originals are attached to the heatsink. Knowing I can get the 2nd type of heatsink to go on these (which is the spring loaded type), the original heatsink is connected to the board, because it is connected to the transistor (permanently...I tried to pry one off and it seems impossible) ,connected to the board via a lanz, so do I need to solder a jumper from the collector to this point?
If I can get a descent picture, I'll post it ,although I have already pulled these from the board (and marked them), so I could check the pins. All four on this board checked different on my fluke rms meter, so I checked them against a known 'new' NTE part and it turns out only 1 measures correctly.
[Updated on: Tue, 14 June 2011 00:25] Report message to a moderator |
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| Re: part substitute problem [message #15870 is a reply to message #15851] |
Wed, 15 June 2011 18:25  |
stevem
Messages: 4772
Registered: June 2004
Location: NY
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Senior Member |
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The heat sinks on the original transistors are solder to the board but they make no circuit connection at least in the K200-B and latter serise amps , if you have a A serise amp this may not be the case, so installing a replacement transistor with a slip on type heat sink is all that needs to be done.
[Updated on: Wed, 15 June 2011 18:31] Report message to a moderator |
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