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I had this same question come up with a B&K EX442 amp this week

This ebay listing for a Sonata EX442 looked strange to me. When I compared it to another Sonata EX 442 currently listed on ebay, yes, this one lacked the external heat fins. Then searched online and even the pre-Sonata EX 442 amps have the heat fins outside, and have fuses.

I did find an EX 442 that had been listed recently that also lacked the fins, but without a pic, I can't tell whether heat fins are inside instead.

Was this some kind of transition period between the heat fins on the back Sonata version of the EX 442 and the 4420 that followed?

http://www.ebay.com/itm/B-K-442EX-Sonata-Stereo-Power-Amplifier-Professionally-Serviced-/151635298192?pt=LH_DefaultDomain_0&hash=item234e2b0790


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