ROG JFET AMP SIMS @ >9v ? Any Field Reports?

[bwanasonic]

Getting a shopping list together for experimenting with some of the ROG JFET pedals, and was wondering if anyone has tried running them at higher voltages (ie. 18v)? I plan on starting with the Supreaux.

Kerry M

[spongebob]

Yes! I now have the ROG "Eighteen" running at 15V in my DIY solid-state amp, feeding a TDA2050 chip amp, and it's performing rather nicely! It definitely sounds different than the 9V version, and to my ears it sounds better, hard to describe... the character of the distortion seems to be improved.

I would say it's worth a try, I also noticed that the BF245 JFETs I wanted to use behave a lot better at higher voltages, it was impossible to use them in the 9V circuit, the drain voltage was either too low (<2V) or too high (>8V).

[Nasse]

:shock: JFETS at least give us the change to try it. With 4049 mosfet inverters you are limited to 9 volts (well you can put little more but not much, and of course you can lower the voltage...)

I only have tried minibooster at higher supply voltages, and from that and what I have read about comments who have done that I believe the differences might be subtle. But that difficult area between clean and distorted it might be the way for something

[petemoore]

These cheep easy to get regulators, make it easy to dial in different supply voltages.
 Just watch the heat levels when you're going for a big Voltage drop. Should be able to go low enough with one of these to test for tonal differences VIa Variable Voltage Supply on distortions N/P...IIRC I was able to get around 4-5v from 9V using a Regulator I got from RS without heat dissipation problems.
 I just worked my way down in voltage slowly, at about a 1/2v at a time, letting it run for a minute to build up heat, and felt the regulator begin to get warm as % of V drop increased, and decided there was no need to go lower.
 Even tho I don't, having one of these at your bench's circuit board test platform might be a good idea...just another thing that can relate to tone.