2006年1月15日 · Hi, Just curious why did you use a 12BH7 as opposed to the 12AU7 or the 6SN7 or 6CG7 tube? I am not doubting your choice for the tube used. Have been looking around for …

2022年12月5日 · 110k seems much too high a plate resistor for the 6SN7 gain stage in this circuit. If you insist on a B+ of 150 volts, a 30k plate resistor will give decent results and the complete …

2016年8月20日 · New Products & Super Triode Amplifiers They offer a very nice looking preamp board too. I built a similar constant current 6SN7 preamp and really like it with cheap 2092 …

2020年3月1日 · Then, bought some boutique 6SN7s no longer made. If you do go with a 6SN7 based preamp, and must buy new tubes, try the Sophia Electric Blue - not cheap but nice. …

2022年2月22日 · @hilde45 another factor in responses so far may also relate to some people jumping up a level or two on design and improved parts quality with their next tube preamp …

2017年11月12日 · There's countless tube preamp designs out there and you haven't said what it needs to do and so on. However, assuming you landed on a single 6SN7/channel as a design …

2022年6月21日 · I want to build preamp consist of 7193 or 6sn7 at the Input as a driver for 6V6 which will be at the output stage. Do you know any very successful design based on those …

2002年11月18日 · It's a great high voltage driver that can source some current, but for a CF intended to pass a couple of volts at most, a higher gm tube with higher mu might be a better …

2017年1月9日 · The 6AH4 is a 7.5W power tube. It is probably only linear when it is standing quite a bit of plate current. That could be a good thing in this case. If you use it that way, the tube …

2017年9月23日 · I have owned this preamp for several years and have only replaced the original tubes, which may have been EH tubes, only once and the Soviet manufactured tubes are still …