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RE: In that case I am curious . . .

Posted by Tre' (P) on August 15, 2012 at 12:58:47

In Reply to: RE: In that case I am curious . . . posted by Biff on August 15, 2012 at 08:14:20:

I can understand that sentiment.

But I'm 57 years old and have been doing electronics since I was about 13.

I burnt up a table radio doing a dumb thing. I replaced a tube with the wrong type (it looked the same, it really did :-) ) and Dwight Finuf MADE me pay attention to every move he made trouble shooting the thing.

When he was done and the thing was fixed I understood exactly what burned up and why.

Dwight (K6LOV) worked for Northrop Aerospace. He worked on the electronics that released the para-shoot for the Apollo missions and when Northrop would lose their government contracts and let everyone go, Dwight would open a TV repair shop.

There are a lot of circuits that will amplify audio signals and some can sound good to a lot of people. That doesn't mean they are amplifying the signal with the least amount of change to that signal.*

If you study the plate curves of a tube, the tube will tell you the operating point (voltage, current and load line) where there will be the least harmonic distortion.

You have to watch out for Miller and stray capacitance and make sure you have the drive current to overcome that shunt capacitance. All audio transformers in the circuit need to be the best you can afford with the highest bandwidth.

I subscribe to Lynn Olsen's design philosophy.

Make every stage as linear as you can.

That is my goal, and the way I see it, the original goal of this hobby. In a way that goal has been forgotten and a lot of people claim that the only goal it to "make the owner happy". There are a lot of what I call "Happy, Happy sound machines" out there. I mean they are sound producers not sound reproducers.

I guess that's fair enough but it's not the original meaning of Hi-Fi.

*With a phono preamp we have to restore the frequency response and phase response using an inverse RIAA filter. But even this we want to do in a precise way, not just something that "sounds good".

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

• http://www.nutshellhifi.com/triode4.html   (Open in New Window)

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