lynn_olson
Responses from lynn_olson
| 300b lovers I second what Don just said. Building a kit is far more rewarding than messing around with cables or component-swapping. You get to hear for yourself what XYZ capacitor sounds like, instead of reading random comments on the Internet. I can’t empha... | |
| 300b lovers Good read on the 6L6, designed by the RCA team that also created the 6V6 a year later. Vacuum Tube Valley on the 6L6 And of course the 45 Vacuum Tube Valley on the 45 | |
| 300b lovers The tube Don, myself, and many other manufacturers would like to see go back in production would be a 45. NOS examples are astronomically expensive now, and surely production costs would be similar to, or less than, a 2A3. It’s basically a very si... | |
| 300b lovers Good, although brief, discussion of the 6EM7 on Thomas Meyers’s Vinyl Savor page. It looks like a TV tube, not designed for audio, so NOS examples might be somewhat variable (the application in the deflection circuits of a TV would only have moder... | |
| What do you know about a WESTERN ELECTRIC 86-A amp ?? Modifying it (by replacing capacitors) will destroy its value, so don’t touch anything, including the wiring (WE wire is highly prized by collectors). The most famous WE collectors are in Tokyo and South Korea, so I guess that’s where it would fe... | |
| 300b lovers What makes the 45 or 300B "hard to drive" is that it is good practice to have the majority of amplifier distortion in the final power device, not the driver. In other words, the driver should be cleaner than the 45 or 300B ... which are the lowest... | |
| 300b lovers Without making a big deal of it, Don and I have definitely taken the Blackbird several steps (with new parts, and some new circuits) beyond the amps at the show. You guys are in for a treat. | |
| 300b lovers Playlist Here’s what I’ve been listening to for the past year. Probably zero percent overlap with Don Sachs, and only 10% overlap with the folks at Spatial. It’s a mix of dense heavily-produced rock, London Sound, and German techno. Joywave: Tra... | |
| 300b lovers They all had a different "house sound". Marantz was crisper and more resolved, a more hi-fi sound, and Fisher sounded like a really good console. Not sure if the H.H. Scotts had a consistent sound or not ... they were mostly known for their FM tun... | |
| 300b lovers Interesting circuit ... thanks for posting it, Ralph. It’s kind of weird the actual gain/driver tube is a powerful 12BH7, while the cathode follower is limited to 1mA or so from the 12AX7, which is about the worst possible choice for a driver. Ve... | |
| 300b lovers I’m no expert on the MC30, but it is very unusual. The cathode feedback (from a special tertiary winding in the output transformer) results in very low gain for the 6L6 power tubes, so the driver has to swing 100 volts, putting extreme demands on ... | |
| 300b lovers Don is being modest. The last year, going through the present, really made Don pursue every obscure byway of amp design, building and listening as he went, every step of the way. Don started with an obscure version that I called the Symmetric Rei... | |
| 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... |