I'm writing my degree on the U47 and need your help

[rob aylestone]

The thing that really annoys me is when they harvest the net for their data but never think to return with the conclusions. Its rubbish research for a poorly designed degree.

When people do it properly, you get loads of university paperwork, telling you who is monitoring and controlling. They give you university research rules and warn you of your entitlement to withdraw at any time. The entire thing is different. I am not sure how it is in the US, but here, unis often have to spend much of the first year improving students research skills, and their forumative work before they can produce conclusions. I wonder if the ones we get are set designed to reveal the flaws, and uncover the bad research techniques. They smugly submit them and get them ripped to shreds. I really do suspect this is behind the daft ones. In my day, a supervisor said NO to most things that passed their desks.

 

[ecc83]

Re "PUP coils and Capacitors" it must be remembered that a responsible manufacturer will test at every stage.
Yes, two hand wound coils will differ (number of turns should not unless the bloke ignores the counter!) in tension and thus inter-winding spacing. That will affect the self resonant frequency but that is easily measured to ensure it is within tolerance. Bit academic now? Surely virtually all the coils are done by super consistent robots?

Capacitors are surely only made by machine and so their "wrap" is very consistent. Value WILL have a tolerance but again it is easy to automate the checking of every component. The tolerance is generally + or -10% and that could have an audible effect on the tonal balance of say two mixer channels (but usually only the roll off outside the audio band. Well below 20Hz say and well above 30kHz)

But! Gear is tested in the factory! Much of my time with guitar amplifiers* was spent "spec checking". Comparing the factory design specs to a sample in the workshop. I rarely found anything out of range.
Of course! There are those that say "Ah! but the BLUE caps SOUND better than the (xxxx) ones even though they have exactly the same value". All I can say to that is "show me a peer reviewed test paper"

*I can post a "redacted" sample if anyone is interested!

Dave.