lynn_olson
Responses from lynn_olson
| Spatial Audio Raven Preamp Nice that the Raven ticks all the boxes! Seriously though, you’ve pinpointed (better than I could) what separates the Raven from a conventional Marantz 7C re-creation. The preamps from the Fifties and Sixties followed a pattern of 2-stage 12AX7’s... | |
| Amp showing its age? Transistors don’t age. They keep working, staying within spec, and one day, fail without any warning. When that happens, as often as not, several other parts burn out as well (typically resistors). In other words, they work fine until they don’t. ... | |
| Spatial Audio Raven Preamp A pair of subs don’t need to be exotic or anything, just fill in the gap below the horn cutoff. And two are definitely better than one. I prefer stereo bass, but the home theater folks use a mono input to drive 2, 3, or 4. I don’t care about sound... | |
| Spatial Audio Raven Preamp I should add that all folded bass horns are tricky beasts. They only exist because a true straight bass horn that is flat to, say, 35 Hz, would be the size of medium-sized car. In other words, the size of an adjacent room. Two needed for stereo, o... | |
| Spatial Audio Raven Preamp The degree of overlap between the horns and the subs (at least two) will be entirely subjective. Unlike closed and vented boxes, horns do not have a smooth, predictable cutoff region (which is 12 dB/octave for all closed boxes, and 24 dB/octave fo... | |
| Spatial Audio Raven Preamp The Raven has split windings on the output transformer so both RCA and XLR’s can be used at the same time (the RCA output uses one-half of the secondary winding). So feel free to use to use the RCA output to power the active subs. However ... the... | |
| Don Sachs Owners Thread Don't know anything about the Dennis Had amps, but what you describe sounds like a bad pot, with a damaged area on the carbon track. Sometimes this can be resolved with plenty of contact cleaner, but if the track is damaged, the contact cleaner wi... | |
| Spatial Audio Raven Preamp I used to think that rules-of-thumb applied to transformers. Well, no. Maybe in the Fifties when they were designed with slide rules, but now you work closely with the designer and their simulation software, followed by a sample build. Model, buil... | |
| Spatial Audio Raven Preamp It might sound odd, but both the Geshelli and the Raven have a similar parts cost to retail price structure. Solid-state isn’t really that expensive if you buy the parts in hundreds to thousands quantities. And the expensive, heavy case with the 1... | |
| Spatial Audio Raven Preamp I own a Geshelli DAC and their new balanced headphone amplifier. Although value-priced, both products use the Sparkos (made in Colorado!) discrete op-amps, with a very large Class A operating region. If you’re going solid-state, this is an attract... | |
| Help on ancient Audionics CC-2s A few years ago, I walked into a Boulder camera store and saw a pocket book documenting a "Classic Camera Series - Nikon FE2". Hey, I bought that camera new, a month after Nikon introduced it! Not only that, it was my *second* SLR, after my 1963 v... | |
| Help on ancient Audionics CC-2s Hi there folks, old Audionics hand here. First off, replace all electrolytic caps, both large and small. Electrolytics have a finite lifetime, and modern ones are more compact, more reliable, and quite a lot better sonically. The CC-2 was designe... | |
| Western Electric 300a and 300b The only difference between the 300A and 300B is the locating pin, which is not used by any modern amp. I believe the 300A was only made by Western Electric for one or two years, then replaced by the 300B. I would check the provenance of any tube... | |
| Spatial Audio Raven Preamp RFI = Radio Frequency Interference EMI = Electromagnetic Interference (includes magnetic fields) 15.75 kHz (or close to it) is the horizontal scanning rate of 525/60 NTSC (color or monochrome) analog television. The 625/50 PAL or SECAM rates are... | |
| Spatial Audio Raven Preamp The Raven accomplishes several things at once: 1) Moderate voltage amplification (from the 6SN7). 2) Substantial current multiplication (from the internal step-down transformer). 3) Signal conversion from either RCA or XLR to RCA, XLR, and head... |