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#461
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BT - I also swapped to the Active outputs on the pre-amp - no change in behavior. FWIW, I do have a power conditioner (API Power Wedge - another 20 YO vintage). ed
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ed 2016 GT4 2005 Lotus Elise 1994 RX-7 R2 |
#462
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I will sound like a broken record - check out Brett's used / vintage gear at Hifi Heaven and Command Performance AV both located in Falls Church.
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John B 79 930 87 951 (sold/engine in wrong end) 86 911 Targa (sold/missed) |
#463
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Thanks to Jay for the loan of a couple pieces of equipment. It's the power amplifier.
Off to shop for some new kit. ed
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ed 2016 GT4 2005 Lotus Elise 1994 RX-7 R2 |
#464
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Ended picking up a PS Audio Stellar S300 power amp. This is a hybrid - class D with a MOSFET class A input stage, built on a pair of ICEpower modules which can drive 300 WPC into 4 ohms.
The low pass filter for the class D section rolls off at 50kHz. VERY impressed so far - very listenable right out of the box with great detail and sound staging. Unless something goes drastically wrong I’m probably hanging on to it. Ed
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ed 2016 GT4 2005 Lotus Elise 1994 RX-7 R2 |
#465
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Command Performance Audio in Falls Church is taking on Burmester gear. Very blingy!!!
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John B 79 930 87 951 (sold/engine in wrong end) 86 911 Targa (sold/missed) |
#466
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That $tuff is pricey! Pretty nice gear, though.
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David D. '87 Targa - 2021 quickly disappearing... |
#467
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Next project is to build an updated version of the chip amps mentioned here. New version uses dual EC7293's producing 60wpc/8ohms or 120wpc/4ohm.
https://youtu.be/tmQdHv_glcY?t=123 Will probably be getting rid of the 50wpc PP monoblocs I built a couple years ago if anyone is interested.
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Kyriakos E. Stylianos Baglama inspired 1982 SC Targa - (Currently Wallowing for GothingNC) Last edited by Charlie Stylianos; 03-02-2020 at 04:32 PM. |
#468
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The chip amps look like a very interesting rabbit hole to go down... https://spectrum.ieee.org/consumer-e...-sort-of-cheap
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Ed Devinney ::: phase 1: collect the underpants. Purcellville 993 + Boxster S + Eurovan MV + 4Runner + Volvo 122 |
#469
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After doing some research I bought a 3e TPA3251-based amplifier board. 100+wpc at tiny distortion and reviews said the sound was good, so our trade deficit is down another 70 clams to China.
The IEEE article called for a linear power supply, but most folks who build find that a switching power supply works well, so picked up a Meanwell 24vdc switcher. Everything came in this week and I couldn't resist cobbling it together to listen. Net result: damn fine sound, accurate and fast. The little (4"x4") board didn't break a sweat at enthusiastic levels through Kef104/2 speakers which can be a challenge to drive. Extra damn fine for $100 in parts - the case and face plate will cost more. Watch for a pair of Bryston 2b-lp pro amplifiers in the for sale forum soon...
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Ed Devinney ::: phase 1: collect the underpants. Purcellville 993 + Boxster S + Eurovan MV + 4Runner + Volvo 122 |
#470
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The photos on the IEEE site (which I've kept open planning to do what you did) don't show a heat sink. Did you buy that separately or did it come with the board? Was the switching power supply a money issue or a quality one (the toroid transformer looks cooler, but probably makes the amp much heavier)?
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Peter (not "Pete") K. 2016 Cayman S 1999 Miata ("SM") race car 2016 Toyota Highlander--tow vehicle/wife's DD 2017 VW GTI SE (DD) Gone and missed: 1992 Miata ("SSM") race car 2009 911 C2S Coupe 2004 Toyota Prius - sold to son's girlfriend 2006 Dodge Durango 2003 Acura MDX 86 Black 911 Coupe race car 86 Gold 911 Targa 82 WineRedMetallic 911 Targa |
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