Author Topic: Si or op amp Rangemaster style circuit  (Read 342 times)

Silvio55

Si or op amp Rangemaster style circuit
« on: February 10, 2018, 12:53:51 PM »
Hi! I'm looking for an alternative circuit that can "replace" a Ge Rangemaster. I've been using a modded RM for some time and I love it.
I've put a large input cap in mine, so it's like a full range booster, sort of a fuzzy OD, I use it with pushing a cranked JMP 50 plexi clone I made and a Strat. I leave the RM always on, and control the gain with the guitar vol knob. This way it cuts some highs with the guitar vol on 10, giving a fat overdriven tone, with some fuzzy textures, but rolling back the volume and it cleans up perfectly, with the highs back, getting a sparkling clean tone, it behaves similar as a Ge Fuzz Face.
I wanted to know if there's a way of achieving a similar tone with that nice "clean up", but with less hiss and with a more stable and easy to get/replace transistor, or even op amp.
Thanks!

nocentelli

Re: Si or op amp Rangemaster style circuit
« Reply #1 on: February 10, 2018, 03:49:39 PM »
The catalinbread Naga viper is a Si version of the RM, with an added range control (input cap blend) and a gain control to dial in the amount of dirt added by the transistor: worth a try out on the breadboard.
Quote from: kaycee
squeeze on the back and never open it up again

Passaloutre

Re: Si or op amp Rangemaster style circuit
« Reply #2 on: February 10, 2018, 04:44:54 PM »
I've had good luck using small caps (e.g. 47p or 470p) from collector to base to warm up Si fuzz circuits, and simulate the warmth of Ge. Works great in the Fuzz Face, I don't see why it wouldn't in a Rangemaster. That said, my Ge Rangemaster (my first DIY pedal) is still a favorite, and I see no reason to replace it.

Silvio55

Re: Si or op amp Rangemaster style circuit
« Reply #3 on: February 10, 2018, 06:59:07 PM »
The naga viper is in my plans for a future build and see if it fits me. Other sugestion i've got was the Omega booster.
I'm not looking for replace my RM, I just thought it could be cool to have another circuit that replicates what the RM does, but without the Ge transistor.

smallbearelec

Re: Si or op amp Rangemaster style circuit
« Reply #4 on: February 10, 2018, 07:06:34 PM »
if there's a way of achieving a similar tone with that nice "clean up", but with less hiss and with a more stable and easy to get/replace transistor, or even op amp.

Get out your breadboard and see figure 27 and figure 30 in this article:
http://diy.smallbearelec.com/HowTos/BreadboardRMs/BreadboardRMs.htm

The RM can be done with "remainder" devices, and the result can be better than the original with no power supply issues. But you have to fish a little for suitable parts and experiment.

Silvio55

Re: Si or op amp Rangemaster style circuit
« Reply #5 on: February 10, 2018, 08:57:15 PM »
Cool! Thanks!