atmasphere
Responses from atmasphere
| Alpha Core Goertz I thought the Zobels were for 10 foot or greater lengths and used with certain tube amplification?. @jacobsdad2000 Probably not. Tube amps are not likely to go into oscillation and blow up as spectacularly as we used to see with solid state amp... | |
| Tube amplifier - tube bias and time to warm up Is matching output tubes necessary if I can adjust bias for each of four tubes ? @inna Yes! Its one thing to set the bias point, which defines the operating point of the tube. But the tube has a dynamic operating curve; ideally each of the tube... | |
| As An Experiment I Stuck A Few Things Under My Pre-Amp And Am Now On A Quest @neonknight Your experience suggests that your preamp is picking up vibration from the shelf on which it sits. The pads you made are providing some isolation. By adding more pads, they were not loaded as much and so vibration was simply being tran... | |
| Alpha Core Goertz Is it possible the Goertz cables already have the Zobel’s installed internally, and I just may be adding a second set? No. But its very possible that a ZOBEL network is inside your amp! | |
| Alpha Core Goertz The issue here is that the Goertz cables have high capacitance. If connected to an amplifier with a poorly designed feedback loop, the result can be an oscillation that can damage the amp (and probably a tweeter) in very short order. This was a mu... | |
| 300b lovers I have a thorough dislike of working with lead-free solder. Nothing flows in a point to point build like a good 2% silver solder. @donsachs That is why its worth it to work out the math. The lead content in your product is a percentage allowa... | |
| Best Vintage tube amp / preamp manufacturer I worked on a lot when I was putting myself thru college working as a service technician. The best preamp from that time for me has been the Citation 1 preamp from Harmon Kardon. I prefer it to both the Marantz 7 preamp and the Mac stuff. I don't... | |
| 300b lovers Don, myself, and the team at Spatial intend to be on the straight and narrow when it comes to regulations ... we are not Tesla, Apple, or Microsoft, with armies of lawyers to smooth the path into new markets. To gain the CE mark (which says tha... | |
| 300b lovers Try removing the 56K load resistor entirely and give it a listen. You might like it better. Remember, with conventional signal sources, there is almost no ultrasonic content, so the ringing in the transformer is never stimulated. And getting rid ... | |
| 300b lovers The problem with two successive stages that are balanced and DC-coupled to each other is that DC drift is a big deal. A 1 volt shift on a 150 volt plate is normally inconsequential, but becomes a serious concern when the grids of the following st... | |
| Flat copper speaker cables @ortodox , what @ketchup said. | |
| Flat copper speaker cables Check our Goertz Alpha-core they make flat ribbon cables both copper and silver. Goertz used to make a product that had 4 copper ribbons in mylar side by side. We used that to sandwich the 4 conductors, alternating the + and - connections on... | |
| surface noise reduction Yet I might invest in a better cart one of these days. @boxcarman If you are listening carefully and without bias, I think you'll find that the ability of the arm to track the cartridge correctly is far more important than what cartridge you ha... | |
| 300b lovers A Mullard PP 300B works as follows: input tube direct-coupled to a long-tail pair (or CCS) of triode-connected 6V6 drivers. These in turn are connected to a PP interstage transformer with a modest step-up ratio, between 1:1.4 and 1:2. The interst... | |
| surface noise reduction @boxcarman You have two really important issues to address that were both brought up by @lewm early in this thread. The first is cartridge loading; cartridges like yours really need a proper load to sound right! If unloaded, the inductance of the... |