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Old 15th January 2004, 08:01 PM   #1
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Default BGW 750 transistors

I have inherited an old BGW 750 power amp.
The output TO3 packages are rusting and I was thinking of updating them and perhaps the drivers too. has anyone out there researched some suitable replacements. THe existing ones are probably still OK. I haven't powered it up yet. I am replacing the old leaking Sprague electrolytics and giving it a general clean up first in my limited spare time.
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Old 16th January 2004, 11:50 AM   #2
djk is offline djk
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The later BGW750 had a complimentary output stage, earlier was quasi.

Use MJ15024/25 for later, and just MJ15024 for earlier.

Actual devices used on earlier models were epitaxial 2N3773, the curves for the MJ15024 are on the same graph in the Motorola data book.

The BGW1000 used 2N6259, the closest to this is the MJ21194.

Replace the tantalum caps with low leakage electrolytics.

Leave the opamp alone, it is a 70V/S part.
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