lynn_olson
Responses from lynn_olson
| 300b lovers Don and the Spatial team will be in Dallas, but I will be home here in Colorado. If Spatial goes to the Seattle show this year, I will be there along with Don. I learned my lesson about flying last year. This time, I’ll fly First or Business Clas... | |
| 300b lovers Maybe Peregrine. Something fast and powerful, which are the hallmarks of these designs. | |
| 300b lovers Maybe Swift. | |
| 300b lovers As an overview, the Raven is a 1-stage amplifier with a 4.5:1 step-down transformer, and is output-limited by what both sections of a 6SN7 can crank out. The Blackbird is a 3-stage amplifier with a 28.7:1 step-down transformer, and is output-limit... | |
| 300b lovers Most likely not. It can drive 600 ohm phones no problem, but definitely not 16 to 32 planar phones, which are pretty popular these days. They require small power amplifiers in the 2-watt range. | |
| 300b lovers Just heard the first production Raven was completed, and the folks at Spatial Audio in Salt Lake City thought it was a big step up from the Raven preamp at the show. It uses a new Monolith power transformer, a newly designed input transformer, and... | |
| 300b lovers I showed the pix of the Amity (1997) and Karna (2003) amplifiers to emphasize they were developed largely in isolation from the SET community. I found out the hard way that SET practice wasn’t always useful with this approach. Similarly, practice ... | |
| 300b lovers If it doesn’t say "electrostatic shield" there’s no copper foil between windings. Medical-grade is even better, with primary and secondary on opposite sides of the core. If you want full isolation, in the absence of these features, you need two t... | |
| 300b lovers And here’s the very first version, the 2-stage Amity amplifier, built on old Tektronix chassis by Matt Kamna in 1997: | |
| 300b lovers Here’s a close-up of the 2003 Karna amplifier, showing one channel of the audio chassis, with the power supply chassis out of sight. These have been my personal amplifiers until I received a pair of Statements about eight months ago. Note the avi... | |
| 300b lovers The Statements are the previous versions. I strongly urged Don to use a spacious layout, with all components on a single layer. Easier to build and signal-trace. Don ran with the suggestion and improved it by putting all the power supply component... | |
| 300b lovers Alexberger, the Cinemag input and interstage transformers are under the top plate. These are the third generation of the custom Cinemag transformers we started with. The two Monolith transformers are visible on the rear of the top plate. The othe... | |
| 300b lovers From Don Sachs: "First pair of production Blackbirds in walnut... running and sounding really good for only 10 minutes on them :) Tomorrow we start the first pair of production Ravens...." | |
| 300b lovers 1. If the heater windings are not shielded from the high-voltage B+ windings, switch noise from the B+ section can be capacitively coupled to the low-voltage heater windings. Although indirectly heated tubes have significant isolation from line no... | |
| 300b lovers Here’s the latest: Don is training the folks in Salt Lake City as we near production. The Raven preamp is the same preamp you heard at the show, while the Blackbird now has KT88 drivers, at twice the power of the 6V6 drivers, with third-generatio... |