DIY Valve Guitar Amp Head

[Marcel]

Yeah Doc, can't fault what you wrote so your theory is up there...

Personally, I still can't get over the fact that some people (particularly on other forums) truly think that an active circuit using an Op-amp and a capacitor imitating and inductor is better than a real (passive) inductor made from simple copper wire.... True, the Op-amp circuit maybe more versatile, but still it amazes me...

But I do appreciate some of the wicked and awesome things than can be done with electronics (in all its forms) these days. I've worked on all sorts of gear, some that operate from DC all the way through to gear that works on damn near daylight yet there near isn't a day goes by where I don't encounter some new way of doing things with electronics... so it is refreshing to 'dive into' a good tube job where the technology hasn't really changed much in decades.

One thing that does get 'up my goat' and yet I often have a good laugh over is the fault finding techniques that are there for all to see on YouTube... There are few that achieve in my opinion a 'Good' status, and one or two who are expert, but where I get the best laughs are those who fumble about and change parts willy-nilly for an hour or two until the poor amp gives in and starts to work again...

[DrNomis_44]

Yeah Doc, can't fault what you wrote so your theory is up there...

Personally, I still can't get over the fact that some people (particularly on other forums) truly think that an active circuit using an Op-amp and a capacitor imitating and inductor is better than a real (passive) inductor made from simple copper wire.... True, the Op-amp circuit maybe more versatile, but still it amazes me...

But I do appreciate some of the wicked and awesome things than can be done with electronics (in all its forms) these days. I've worked on all sorts of gear, some that operate from DC all the way through to gear that works on damn near daylight yet there near isn't a day goes by where I don't encounter some new way of doing things with electronics... so it is refreshing to 'dive into' a good tube job where the technology hasn't really changed much in decades.

One thing that does get 'up my goat' and yet I often have a good laugh over is the fault finding techniques that are there for all to see on YouTube... There are few that achieve in my opinion a 'Good' status, and one or two who are expert, but where I get the best laughs are those who fumble about and change parts willy-nilly for an hour or two until the poor amp gives in and starts to work again...

Yep, some people forget to realize that Op Amps, being active devices, do introduce noise and distortion into a circuit, that's the nature of active devices, valves introduce noise and distortion into a circuit too but they produce different distortion harmonics due to the non-linearity inherent in valves, the noise is produced by the electrons boiling off the cathode during thermionic emission.

When I'm fault-finding a piece of electronic equipment I always try to maintain a logical approach to it, and treat it as if I'm a detective working on solving a mystery.