lynn_olson
Responses from lynn_olson
| 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... | |
| Why don't they record in ‘surround stereo’? There are now hundreds of Dolby Atmos remixes of classic stereo recordings. It’s not generally understood that Atmos is a superset of Dolby Digital 5.1, and Atmos content will be automatically down mixed with no loss of fidelity to 5.1 if the AVR ... | |
| 300b lovers An oldie but a goodie. Locating the operating point of a triode | |
| 300b lovers The sonics of power supplies are different for SE and PP amplifiers, so it is impossible to generalize without specifying the amplifier topology. The modulations of supply current on the main B+ supply in a single-ended amplifier are simply the m... | |
| 300b lovers It turned out the ultrapath capacitor wasn’t sonically that different than a conventional cathode bypass cap. In the context of a regulated supply with an output impedance of 3 milliohms, and equivalent to a 2000uF passive supply, the Zout of the ... | |
| Blown Cap???What Else To Replace During Service??? Look for burned areas on the circuit board, as well as burned-looking resistors. If a capacitor shorts out, it will often take other components with it. Transistors can fail in milliseconds with no visible external signs. They will need to be tes... |