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In Reply to: RE: Poor Design for a Preamp posted by mwhouston on February 26, 2025 at 17:55:07:
"Tried this ides with a 6N7 preamp I also had noise issues with and it worked well.Even with my DIY shieldless lead (175pF) into 100K upper 3db was 37KhZ. 6N7 are power tubes and Im not sure of they have a very high frequency range or not. Regardless I'm happy with 37K."
The 6N7 was primarily intended as a Class B output tube. But the 6N7 data sheets (GE, TungSol) suggests multiple uses for the tube including use as a Class A driver and gives suggested operating points for that application. Since nobody in the DIY community seems interested in building Class B amps all the forum discussion on the 6N7 seems to be about using it as an input / preamp tube.
Apparently, there are some glass (G, GT) versions. I have some of the 6A6s which are glass. The 6E6, 79 and 53 are supposedly equivalents or near equivalents. There's also the 5694 which is equivalent or nearly but has separate cathodes.
At one point I was considering building a Japanese SE 2A3 design that uses them on the input but I was going to use the 6A6 version. I like using less common tubes but I don't really have a need for a preamp with that much gain (mu 35).
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Follow Ups
- RE: Poor Design for a Preamp - FlaCharlie 10:19:33 02/27/25 (2)
- RE: Poor Design for a Preamp - mwhouston 14:13:55 02/27/25 (1)
- Metal Tubes / Tube Sources - FlaCharlie 10:43:52 02/28/25 (0)
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