lynn_olson
Responses from lynn_olson
| 300b lovers I apologize for making this sound confusing, but I wanted to give the readers of this forum a taste of what Don has been through. There are many possible ways of getting a zero-feedback amplifier wrong, and from the standpoint of mainstream audio ... | |
| 300b lovers This is entirely up to the transformer designer. They need to know the Zout, or Rp, of the tube driving the primary, and the load on the secondary, which will either be a pure capacitance in the 60~80 pF range, or paralleled with a load resistor, ... | |
| 300b lovers See page 21 for a construction article on a push-pull, zero-feedback 300A/300B amplifier. This is about the same time as Columbia introduced the LP microgroove record, so it’s very early days for high fidelity. What surprises me about this article... | |
| 300b lovers Agree 100%. Don is describing what I hear. The metaphysics are optional, but they have a good toolkit for describing perception. | |
| 300b lovers These are the kind of conversations I used to have with Harvey Rosenberg, who definitely "got it". Unless you knew him, you didn’t realize his clowning around, and occasional jaunts into speculative metaphysics, was an act designed to chase away m... | |
| 300b lovers Umm, hard to describe. More "there" there. More sense of a physical presence, and a better feel of the performer’s musical intentions. More hall sound. Most of all, a feeling of the performer being in the room instead of somewhere "out there". No... | |
| 300b lovers I have to agree with Eddie about the ST-style 45. Aside from driver use, the charm of the 45 is that it is really easy to make a superb, low-power amplifier with it. It has the cleanest distortion spectrum of any tube I’ve measured (closely follow... | |
| 300b lovers The Raven is something else, quite unexpected, really. Don did a superb job on it, no question. The Khozmo volume control, with a L/R balance control thrown in, is the extra deluxe touch. | |
| 300b lovers I am impressed you took the project that far, but the minimum requirement for 10,000 units on an unknown tube is a steep hill to climb. Even at OEM prices, that’s a half-million dollars on a gamble. The "X" tube would have to be very very good, an... | |
| 300b lovers The sonics would be interesting. The target device would of course be the 300B, but with an octal socket with a 6.3V indirect heater, and KT88 biasing. The 300B is more physically fragile than a KT88 because of filament sag, which can happen if t... | |
| 300b lovers People have gotten the weird idea that somehow the filament of the 45, the 2A3, the 300B, and the 845 are responsible for the ultra-low distortion, and the super-vivid tone color, of the DHT family. Wrong. It isn’t. It’s the grid. DHT’s have a ph... | |
| 300b lovers Since nobody is reading this thread right now, I’m going to throw out my wish list, my note in a bottle, to the wilds of the Internet: * I’d like to see LinLai or JJ or any of the other tube vendors, try something a little out of the ordinary. A ... | |
| 300b lovers Just a quick update that Don and I are continuing to refine the Blackbird, with a bit of Raven and Karna Mark I thrown in. The chassis will be 18" wide to give a more spacious layout, a simplified build procedure, and visually match the Raven. Th... | |
| 300b lovers Yes, plenty good enough for the job. Don’s comments above are right on the mark. What you want is isolation. Stage-to-stage, and isolation of the critical filament supply. And if you really want to get hardcore, make sure all the cathode circuit... | |
| 300b lovers You can do a lot of sleuthing just by listening to the spectra of noise. Magnetic induction is going to be pure 50/60 Hz and fairly hard to hear. Capacitive coupling is high frequency only, and will sound like buzz, usually harmonics of 100/120 Hz... |