well SY, you seem to have pretty large knowledge on tube pre-amps used with phonographs and probably other things... what would suggest to be a simple, fewest parts needed pre-amp that offers the required features?... a number have already been posted, and i posted a link with a bunch more... i can build a circuit from parts and a schematic, but i lack the electronics knowledge to design or fully comprehend them myself... im in the process of trying to learn more about electronics engineering
also SY, which statement were you referring to in your last message?
also SY, which statement were you referring to in your last message?
To be honest, if I were going cheap and simple, I wouldn't use tubes. I've published my tube MC preamp, and I think the performance is good, but it's neither cheap nor simple! Best bang for the buck would be a good opamp design, and those can be very good indeed.
If you can live with the severe performance compromises (distortion, noise) of a cheap tube circuit, I'd probably pop for the RCA tube manual passive EQ circuit, then add a buffer stage to the output so that it has less load sensitivity. The input capacitance will be too high for some MMs (e.g, the 150MLX that I use), but fine for others (Shure, Grado).
If you can live with the severe performance compromises (distortion, noise) of a cheap tube circuit, I'd probably pop for the RCA tube manual passive EQ circuit, then add a buffer stage to the output so that it has less load sensitivity. The input capacitance will be too high for some MMs (e.g, the 150MLX that I use), but fine for others (Shure, Grado).
A short span (the board isn't very big and it's bolted in well), support with fingers, and very rare plugging and unplugging of tubes (zero times in the past two years).
Would this work? Looks simple! A hybrid.
diytube.com :: View topic - diy*tube budgie PCBs for sale (Updated 8/29/11)
diytube.com :: View topic - diy*tube budgie PCBs for sale (Updated 8/29/11)
Simple tube circuits like this are pretty easy to analyze, especially when you've built and characterized dozens of circuits like it. You can calculate gain in your head, and knowing what the tube curves are (I have ECC88 fairly imprinted in my frontal lobes since it's a tube I have used a lot), you can estimate operating points pretty closely.
With many tubes, there are unpublished foibles that most old-timers like me know all too well.
With many tubes, there are unpublished foibles that most old-timers like me know all too well.
could anyone recommend a good book on learning electronics engineering and circuits.. so maybe i could learn how these circuits function?.. something that covers analog circuits too would be good
For tubes in audio, there's Morgan Jones's "Valve Amplifiers." Incredibly clearly written.
For general electronics, it's tough to beat Horowitz and Hill "The Art of Electronics."
For general electronics, it's tough to beat Horowitz and Hill "The Art of Electronics."
I think you combine the line stage and phono for more gain on the diytube one.
Here's one I know you like (second preamp schematic), but not so simple! Maybe the simpler first one is doable.
Schematics
Here's one I know you like (second preamp schematic), but not so simple! Maybe the simpler first one is doable.
Schematics
I found Allen Wright to be a nice guy and excellent designer. Our brief correspondence was quite enlightening.
Yes, Allen's circuits are excellent, but complex and critical. The latter is where he and I diverged- I believe in designing the circuit so that power supplies and passive parts aren't critical.
We spent many beers together. I miss him.
We spent many beers together. I miss him.
i checked out those two books SY referenced.. found them on amazon and they seem to be very good sources, so ill have to get them sometime
Yes they are first class tickets on the clue train. Now if I only I can find the station.
i know that feeling simon, ive had attention and focus problems since before i started highschool due to a bunch of head injuries.. got the tickets.. hard part is learning anything from them with a messed up head
Once you get into college these days they are required to give you any assistance required for your education, if they get federal funds. So hang in there. Just don't stand on the tracks looking for the clue train.
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