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I've had 4 ST-140 power amps over the years starting with the original, non-torroid 70 wpc version. Until I buggered it, my third was a 3rd gen (Blue/Red) one.I was able to replace it with another 3rd gen (Blue/Red) but the chassis is different than any 140 I've seen. For starters every 140 I've come across had an external heat sink on the back.
This one has an internal heat sink (on one side only) and the layout internally looks like a later ST-1400, but it still has the ST-140 faceplate.
Anyone else come across one like this?
Opus 33 1/3
Edits: 05/13/15Follow Ups:
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
Dunno. Another oddity. There are no externally accessible speaker fuses on this 140. All the others I've owned had them. Also, I hear a relay click 3-4 seconds after turn on. Never had that on the other 140s.
More and more, I'm thinking this is a ST-1400 with a ST-140 faceplate, although I can think of no earthly reason why this should happen.
Opus 33 1/3
I thought it might be that, but all the B&K XXX0 models I can find have remote control wiring and enabling on the rear, and other visual features that are even more different from the units you are talking about than the Sonatas series we are used to.
Don't have a big solid state amp right now, and don't see myself budgeting one anytime soon, but I sometimes do miss my Sonata EX 442/mc-101 combo. If that EX 442 listed on ebay right now with the rear heat fins is in sound operating condition, someone will get a good deal doing buy it now.
proto type maybe?
I'm thinking two possibilities.
1. They ran out of 140 chassis near the end of production and just used a 1400 chassis with a 140 faceplate, or
2. This actually is a 1400 with a 140 faceplate.
Opus 33 1/3
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