Building the ultimate DIY power amp

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wg_ski

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Joined 2007
K-amps said:


Thats good info...however I have poor memory but for some reason the 250watt figure also comes to mind... thereby made me not think of the 1302/3281's... any thoughts on that?

K-
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The 250W rating comes from the fact that Tj(max) of the TO-3 cased devices is 200C, not 150C as in the flatpacks. R(th) is comparable.

The most likely scenario is that 1302/3281 dies were used, in TO-3 cases with larger (or multiple) bond wires to allow a higher current rating. Most dies can be selected for higher Vceo, so a 250V or more rating is not out of line. If you buy enough of them they'll put them in any package you want, and for a price will do any testing and grading within reason.
 
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