wrote:

"** Which does NOT qualify in any way, shape or form as a BENCH AUDIO GENERATOR suitable for day in day out, knock down drag out bench repair work on smelly, dirty, rusty old guitar amps."

Rusty ? you're lucky they got metal in them to rust. In my country it is hard to get metal, everything is plastic.

** So you have neve seen a guitar amp - right ?


Anyway, what is so knock down drag out about it ?

** Means getting the job done in the most efficient way.


Are you going to do some sort of product testing and rating ? If you are talking guitar amps maybe instead of a low distortion generator you want a high distortion generator. they crave distortion in thoise things.

** So you have neve seen a guitar amp - right ?

Two basic things I do not see you needing for this applicatiion. you do not need anything over 20 kHz and you do not need low THD.

** So you haver neve seen a guitar amp - right ?

The thing you probably could use is a calibrated output level to make sure the amp distorts correctly at a certain level input.


** Yeah - all you need for that is a linear pot and a 10:1 step attenuator.

A DMM will do for calibration of the highest range at say 100Hz at a few spots on the dial - then it remains the same for all lower ranges and frequencies.


Anyway, as far as a generator just use resistors to divide it down and use the function genny.

** Function generators are **** awful for audio repair work, the sine wave is full of high order harmonics that get exaggerated by the treble boost in many guitar amp models. Sounds bad through the speaker and looks bad on a scope.

So you have never seen a guitar amp - right ?

..... Phil