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Can we discuss the video (and preamp design) here in this thread? You said something in it that has blown my mind and I'd like some clarification. You said the current flows through the tube from plate to cathode (when you were discussing cathode bias and Rk). How is this possible if the electrons only flow in one direction (cathode to plate)?!?!
Very good learning especially for newbies to tubes like myself. Thanks for sharing and look forward to subsequent videos
This is the first in a series of videos that intend to cover the entirety of tube preamp design. Starting with a single stage we will build on basic concepts to multistage amplifiers and their power supplies.
Hi.Single stage line preamp as in the video is not a big deal. Any high school kids can build one after school.Ever consider the challenge of building a one-single stage RIAA phonostage (or phono preamp)??Many many say no way - technically impossible.YET, I've built one & have been using it for a few years now as I am a LP vinyl advocate! Being Open, airy & musical sounding that blows any mult-staged phono-preamps out of the way, IME.c-J
Why don't you start a company and market your superior product since you're an expert in the fielKeep 'em coming, Roger!
Can these same design parameters be used in designing the input stage of a power amp? If not, what would change?
I have certainly considered a single stage phono preamp. It's no big deal to do with a high gain pentode however it will have certain limitations such as output drive capability (loading) and noise issues. Anyone who has done one is welcome to share it here.
HI.No, even using one pentode may or may NOT obtain enough gain to any power amp without any active linestage.But I only use 1/2 twin triode to drive direct my tube power amp. Of course, the O/P voltage is way way less than 2V to drive any tube power amp to full rated power.BUT, but do we really NEED to drive our power amp to FULL power at all time???? I don't think so.So my 1 tube 1 stage RIAA stereo phonostage is now driving direct my brandname tube power amp via my DIY passive linestage with volume pot setting from 2 O'clock for high level rock/pop music to sometimes max volume setting for low level classical LP recordings.The music sounds so open, so elegant & transparent. Also very quiet background at full volume pot setting & TT spinning. Of coure, one should never expect chest punching heavy sound levels due to its low O/P voltage. But the quality of music is totally something else, not those mult-staged phono-preamp can touch...... until one listen to it.We want quality music, NOT quantity music like a juke box, right?Guss what triode I used????? NO pentode, please, which sounds "aweful" vs triode.c-J
Hi.What do you WANT to tell?c-J