Midpot to 50k and a question

[angelodp]

Hi, I see a mod with the Midpot on a Marshall 100W SL up to 50kL with a resistor across the input and wiper. Am I seeing this correctly 47k R Yellow, Purple, Orange?

Can I please ask for an explanation of what that R is doing through the sweep?

[romberg]

The resistor will make the pot look like a 25k (or very close to it) value at one extreme and then modify the taper:

https://www.amplifiedparts.com/tech-art ... ifications

Mike

[angelodp]

Thanks Mike, do you see a 47k in terms of color? This seems to be making the pot more linear?

A

[romberg]

I'm horrible at reading resistor colors. But, it would make a whole lot of sense for it to be a 47k resistor. When the 50k pot is all the way up, the circuit looks just like (or very very close to) a stock 25k pot. (47k in parallel with 50k).

Mike

[sluckey]

Am I seeing this correctly 47k R Yellow, Purple, Orange?

yes

[angelodp]

Thank you.

[sluckey]

One small change... Instead of saying "yellow/purple/orange", you should say "yellow/violet/orange". Purple is not on the color charts.

[TUBEDUDE]

Because Violet gives willingly.

[angelodp]

Bueno, Violet it is.

[Stevem]

It should be noted that with a mod like this you will have more mids, but less of a range of adjustability over those mids.

[angelodp]

Noted thanks

[SoulFetish]

One small change... Instead of saying "yellow/purple/orange", you should say "yellow/violet/orange". Purple is not on the color charts.

My professors in art school, would roll her eyes and correct any one who called it color "purple", and say "there's no such color as purple. You mean 'Violet'"