schwarcw
05-28-2008, 12:43 AM
This amp has a committed buyer from a good Polkie here on the forum. However, should the deal fall through and it becomes available I will update this post.
This pure Class A amp is a 140 lb 250 wpc monster. It will drive anything you own. This amplifier is a one owner amplifier that was used by Dipole Dan to drive the Carver Platinum MK IV's. It comes with the original box, packing materials, owners manual, etc.
According to Stereophile (1991):
The mother lode of Krell amplifiers has arrived, and its name is the KSA-250. If the KSA-50 had the weight of a steamroller, this one has the impact of an atomic bomb. Krell amplifiers have always been known for their superb stability and bass control, but have been, in my opinion, somewhat short in the department of musical finesse. Of course the KSA-100 and -200 and the KMA-80 and -160 were superb amplifiers, but there were competitors who gave up very little in the bass region and offered much more harmonic and musical honesty. In this respect, the KSA-250 is a landmark product for Krell; unquestionably their most refined amplifier to date, and possibly the most successful blend of solid-state and vacuum-tube virtues to come down the pike. No, it doesn't do everything perfectly, but in terms of overall sonics, and especially price/performance ratio, it's a winner.
Technical highlights
The KSA-250 is, without a doubt, the most visually appealing amplifier that Krell has yet marketed. Though large and very heavy, the presentation is one of stoic grace rather than imposing high-tech visual intrusion. The amplifier body is finished in flat black, with heatsinks externally lining both sides from front to back. The rear panel is neatly laid out, with single-ended phono sockets and balanced female XLR connectors on either side. Additionally, there are two sets of five-way binding posts for loudspeaker cable connections, which makes speaker bi-wiring a breeze. The front panel is finished in an elegant brushed-gray finish with large, black, attractive, downward-facing handles. The feather-touch power switch is located in the center of the front panel, just above the ubiquitous Krell logo. A blue LED power tally light is positioned just above the switch. All in all, a very nicely designed package.
Internally, the KSA-250 is a study in simplicity as well as a technological tour de force. The 4.5kVA transformer, which by itself weighs 85 pounds (!), is located just behind the front panel, and is in turn followed by four 47,000µF capacitors covered by a printed circuit board. It is important to note that there is no wiring in the signal path, all connections being made via the pcb in the front end, and gold-plated copper-beryllium busbars in the output stage. There are 24 output devices per channel, all operating in class-A mode down to 3 ohms, where the amplifier reverts to class-AB (see Sidebar 3). The KSA-250 utilizes class-A circuitry throughout the audio and power-supply regulation stages, and can actually generate 320Wpc into 8 ohms. It is DC-coupled throughout, without any capacitors in the signal path, and is a fully modular design employing gas-tight pressure connections between all subassemblies, allowing quick and easy servicing in the field.
According to Dan D'Agostino—the driving force behind every Krell product—the deletion of wiring within the signal path yields several benefits, including lack of coloration, long-term stability over many years (no possible oxidation or other internal wiring degradation), and reduced interaction between the output stage and external speaker wiring. Additionally, according to Dan, modular design and wireless direct internal connections produce far greater sample-to-sample consistency than was previously attainable.
This amp is like no other that you can find without spending $5K or more. SALE PENDING
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers009.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers010.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers011.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers012.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers013.jpg
This pure Class A amp is a 140 lb 250 wpc monster. It will drive anything you own. This amplifier is a one owner amplifier that was used by Dipole Dan to drive the Carver Platinum MK IV's. It comes with the original box, packing materials, owners manual, etc.
According to Stereophile (1991):
The mother lode of Krell amplifiers has arrived, and its name is the KSA-250. If the KSA-50 had the weight of a steamroller, this one has the impact of an atomic bomb. Krell amplifiers have always been known for their superb stability and bass control, but have been, in my opinion, somewhat short in the department of musical finesse. Of course the KSA-100 and -200 and the KMA-80 and -160 were superb amplifiers, but there were competitors who gave up very little in the bass region and offered much more harmonic and musical honesty. In this respect, the KSA-250 is a landmark product for Krell; unquestionably their most refined amplifier to date, and possibly the most successful blend of solid-state and vacuum-tube virtues to come down the pike. No, it doesn't do everything perfectly, but in terms of overall sonics, and especially price/performance ratio, it's a winner.
Technical highlights
The KSA-250 is, without a doubt, the most visually appealing amplifier that Krell has yet marketed. Though large and very heavy, the presentation is one of stoic grace rather than imposing high-tech visual intrusion. The amplifier body is finished in flat black, with heatsinks externally lining both sides from front to back. The rear panel is neatly laid out, with single-ended phono sockets and balanced female XLR connectors on either side. Additionally, there are two sets of five-way binding posts for loudspeaker cable connections, which makes speaker bi-wiring a breeze. The front panel is finished in an elegant brushed-gray finish with large, black, attractive, downward-facing handles. The feather-touch power switch is located in the center of the front panel, just above the ubiquitous Krell logo. A blue LED power tally light is positioned just above the switch. All in all, a very nicely designed package.
Internally, the KSA-250 is a study in simplicity as well as a technological tour de force. The 4.5kVA transformer, which by itself weighs 85 pounds (!), is located just behind the front panel, and is in turn followed by four 47,000µF capacitors covered by a printed circuit board. It is important to note that there is no wiring in the signal path, all connections being made via the pcb in the front end, and gold-plated copper-beryllium busbars in the output stage. There are 24 output devices per channel, all operating in class-A mode down to 3 ohms, where the amplifier reverts to class-AB (see Sidebar 3). The KSA-250 utilizes class-A circuitry throughout the audio and power-supply regulation stages, and can actually generate 320Wpc into 8 ohms. It is DC-coupled throughout, without any capacitors in the signal path, and is a fully modular design employing gas-tight pressure connections between all subassemblies, allowing quick and easy servicing in the field.
According to Dan D'Agostino—the driving force behind every Krell product—the deletion of wiring within the signal path yields several benefits, including lack of coloration, long-term stability over many years (no possible oxidation or other internal wiring degradation), and reduced interaction between the output stage and external speaker wiring. Additionally, according to Dan, modular design and wireless direct internal connections produce far greater sample-to-sample consistency than was previously attainable.
This amp is like no other that you can find without spending $5K or more. SALE PENDING
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers009.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers010.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers011.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers012.jpg
http://i126.photobucket.com/albums/p97/schwarcw/KrellandCarvers013.jpg