lynn_olson
Responses from lynn_olson
| 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... | |
| 300b lovers To complete the current loop around the 300B (or any other power tube), there has to be a low-impedance path from the cathode to the ground side of the filter cap of the B+ supply. This can be (A) fixed-bias operation with the cathode at ground, ... | |
| 300b lovers They’re different. * Full-wave uses two rectifiers and only one half of the secondary at a time. Each active half-secondary switches back and forth 120 or 100 times a second. * A bridge uses four rectifiers and the entire secondary all the time.... | |
| 300b lovers I should mention additional heating from 50 Hz working is a non-issue. The design of the power transformer, rectifiers, and regulators are extremely conservative and run very cool. Don has measured the thermals all around the chassis, and we have ... | |
| 300b lovers We'll cross that bridge when we get to it. So far, we haven't ordered any multi-voltage power transformers. When we do, we'll dig into the applicable CE regulations ... | |
| 300b lovers I'm not sure what to tell potential overseas customers to do. Sure, after you hear all the market buzz and read the first reviews, you might be tempted to get on a plane, fly right to Salt Lake City in the state of Utah and buy yourself three good... | |
| 300b lovers Which is why medium to large scale companies have regional service centers, which combine repair, refurbishing, and overall product support in one center. It’s equivalent to a low-yield manufacturing center with a marketing wing (in the local lang... | |
| 300b lovers Yeah, RoHS-approved solder might be a stumbling block, since it requires higher temperatures and a little different technique. We’ll cross that bridge when we get there. Our first goal is getting production under way in Salt Lake City, home of Spa... | |
| 300b lovers As Whitestix mentions above, the Japanese have a "purist" esthetic that applies to audio. But it goes much deeper than that. The CEOs and top engineers of Japanese, Korean, Taiwanese, or Chinese companies are not going to be impressed by the lates... | |
| 300b lovers I was only 11 at the time, but I was dazzled by the private tour of Kurobe Dam. It’s size of Hoover Dam and freaking huge. The dam was nearly finished when we visited as guests of Kansai Electric, and we took this strange little Elves railway deep... | |
| 300b lovers I saw Kurobe Dam while it was under construction by Kansai Electric. The underground power station, deep under the mountain, is like sometime out of a Bond movie set. Two of the generators were running while the third was suspended from a crane. T... | |
| 300b lovers About 12,000 naturalized immigrants a year, it turns out, out of a population of 123 million. Not enough to offset a population loss of about a half-million to a million a year. Returning to the original question, Asian companies are a lot more e... |