donsachs
Responses from donsachs
| 300b lovers @charles1dad I used the 6SN7 to drive both KT66/6L6 and KT88 in two different amps and they are great for that. They are marginal to drive a 300b. As @atmasphere said, there are many approaches and schools of thought about drivers. Many paths... | |
| 300b lovers @gavin1977 No, I am not going to do kits... I am retiring and letting a partner build the 300b project and matching preamp. That should be going before the end of the year. If you make kits you have no control over how they are built and you g... | |
| 300b lovers Or leaving conventional power supply topology behind, and using multiple independent supplies in the proper way😀 | |
| 300b lovers Hi The 6SN7 will barely drive a 300b, which is a very difficult load. I have not worked with 845 tubes nor will I given the high voltages and heat involved, but I did look at the data sheet. Yes, it takes more negative grid voltage to bias on... | |
| 300b lovers @antigrunge2 Glad you have an amp you love. What I meant above is the design of the driver section of the circuit. Your amp is using a 6L6 to drive a 300b, which is a good choice. I was referring to many 300b amps that are pushing tubes like a... | |
| 300b lovers Absolutely. I read a great quote somewhere about a million years ago, that a great tube amp was the sum of three things. How good is the circuit? How good is the power supply? How good are the transformers? If you take care of all three of those t... | |
| 300b lovers The post from @pindac above is spot on. Most people think a 300b is a fuzzy rolled off tube. That is because they heard it in a single ended amp with a mediocre power supply, and most likely an inadequate driver section, and possibly mediocre ou... | |
| 300b lovers I will be there Friday and Saturday in the Spatial Audio Labs room. I will leave by mid day on Sunday because it is an 8 hour drive home for me. Of course I will tour the show, but I will spend a good deal of time in the Spatial Room on Friday a... | |
| 300b lovers HI It is really not my intent to get into detail here for something that is in prototyping. Yes, there have been many balanced tube preamp and amplifier circuits around for years, and I have absolutely no doubt you build an excellent balanced pr... | |
| 300b lovers HI My Pacific is XLR out with no volume control so have not tried direct to amps, but I build a really good preamp so I will continue to use it. The prototype preamp is essentially a circuit that was a thought experiment of Lynn’s for a fully bal... | |
| 300b lovers Hi all... Mark wrote and said he posted something so I thought I would chime in. The amps are push pull 300b monos and are 27 watts/ch. Not your flea watt 300b. It has been a really fun project with Lynn Olson. If you aren’t familiar with Lynn, ... | |
| Ordered a Willsenton R300 I just keep wait lists for what I build and you can email though the site. Only preamps and phonos now though. | |
| Ordered a Willsenton R300 Hi The 300b project is not a commercial product now. It may be next year in partnership with someone, but it is not my place to do business here at all. Not appropriate. I am sorry, but I stopped modding gear or working on vintage gear maybe 4... | |
| Ordered a Willsenton R300 Oh I am sure people can upgrade them. Still, the poorly designed driver section is a limiting factor, even with better signal path parts. It could be improved by either CCS or choke loading of the driver, which would make it much better able to ... | |
| Ordered a Willsenton R300 will also depend on their output caps. The photo showed what look like your typical $5 Chinese MKP caps with their fancy labeling. Klipsch used caps that looked like that in the Cornwall IV crossover. Changing them to something like a vcap od... |