Hey All...
I wanna build a Range master but the only Ge trannies I could find are AC127 and AC187... So, If I use them, should I change any other part(s) value?
If so, how do I know what to change and to what new value?
(P.S. is the AC187 suitable for fuzz face use?)
:?
As long as you are getting around 6.6 to 7v at the collector, you're fine. I used a trim pot for R2 (input cap to grnd) , but you could use a trim for R4 (emitter to ground) instead or also, to dial in the right bias for different transistors. Be sure to socket the transistor and the input cap.
Kerry M
Thanx a lot Kerry.
Quote from: bwanasonicAs long as you are getting around 6.6 to 7v at the collector, you're fine. I used a trim pot for R2 (input cap to grnd) , but you could use a trim for R4 (emitter to ground) instead or also, to dial in the right bias for different transistors. Be sure to socket the transistor and the input cap.
Kerry M
Also, be aware that there are other cool sounds you can get out of the RM that are not in the 6.6-7v collector voltage range. So you may want to make that trimmer a pot for external control of the bias. Whenever I get around to actually building a RM I will do this. Also breadboard it first, so you can sort this kind of stuff out before you are committed to the build.
Doug
Quote from: Doug H
Also, be aware that there are other cool sounds you can get out of the RM that are not in the 6.6-7v collector voltage range.
I looked and I couldn't find them :wink: I like my Fuzz Face biased outside the *normal* range (6.x v) , but I found I didn't care for the sounds of the RM with *misbiasing* . Lower voltages do yield some *different* sounds that I might describe as *softer* and *hairier*, and higher bias sounds more *transistor-y* and trebly. But I agree with Doug's point - not to get too hung up on exact bias voltages and twiddle until you get something that sounds good to you.
Kerry M
Quote from: bwanasonic
I looked and I couldn't find them :wink: I like my Fuzz Face biased outside the *normal* range (6.x v) , but I found I didn't care for the sounds of the RM with *misbiasing* . Lower voltages do yield some *different* sounds that I might describe as *softer* and *hairier*, and higher bias sounds more *transistor-y* and trebly.
It probably depends on what kind of amp you are driving and how it is set up.
Quote from: bwanasonic
But I agree with Doug's point - not to get too hung up on exact bias voltages and twiddle until you get something that sounds good to you.
Kerry M
That's the main point! :D
Doug