![]() So I have had a growing pile of "faulty" 6N2P valves that stare at me in the workshop and stir me to think about this issue on a regular basis.Īs mentioned, the valves bias fine, however when driven by a sine wave, the signal triangulates (looks like slew rate limiting) and when driven further there will be a breakthrough on the peaks of the signal - no wonder it sounds so nasty ![]() The odd thing is that the valves bias perfectly, and when a 6N2P-EV is substituted, the distortion seems to go away. However, I haven't been really satisfied with this situation, and have sine wave tested a few sample amps and the ugly distortion is clearly evident when the preamp is overloaded. For those who are not familiar with this valve, it is effectively a 12AX7 with a 6.3v heater.Ī few of the constructed Lamington amps have had a weird distortion when the preamp is overdriven - the preamp sounds great when run clean, but when overdriven has had a really nasty sounding distortion that I was able to "fix" by changing a few preamp valves. The issue concerns the 6N2P valves used in the Lamington preamps. ![]() However, there has been a niggling issue that until now I have been unable to lay to rest. I have been supplying 6N2P valves for the Amp School kits and numbers of these amps have been built successfully this year. I have recently made a discovery that has really surprised me, and wanted to find out if others have had a similar experience.
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