I don't recall if i ever finished this build. Half the time i start it, then it gets turned into something different. I do remember wanting to use this with some other vintage designs as a multi-fx unit. But abandoned the build because of the constant issue of negative voltage designs. Got frustrating to say the least.
To answer your question, all my transistor builds are done with sockets for the transistors. Since germs have such unique sound that vary from part to part. I have at least 40 that once i get the initial build to function how i want, i can swap my germs on the fly to get the most bang for the sound i wanted from the particular fx unit.
My favs are cv7005 and so2 oc75, these have unpredictable leakage and gain values, but thats the fun, and when they start to fail, who knows what your gonna get in the end. Every time you power it up, its a new adventure. Especially when you stack these designs on top of each other, even matched pairs can vary slightly and quality is reduced over time, and they dont always decay at the same rate.
Here is a pic i found on google, it has some of my popular germs on it.
For the most part, depending on the transistor you use, you may have to modify the circuit to meet the values you are needing.
Since this is such an easy project, i suggest looking closer at the transistor your using, ive bought vintage germs that test fine, but the minute i apply test signal and full power, they fail and burn. Oops.
Careful where you buy new old stock, ive been burned time after time.
Also, If your looking for something more stable, i suggest silicone.
<img height="269" width="269" name="storage_emulated_0_Download_2019GPXTransistorPrimer700_jpg_1617770939621" src="http://guitar-fx-layouts.238.s1.nabble.com/attachment/49920/0/2019GPXTransistorPrimer700.jpg" id="HEV1617770939621" onmouseover="imageMousePointerUpdate(true)" onmouseout="imageMousePointerUpdate(false)" style="">
Powered by Cricket Wireless
-------- Original message --------
Date: 4/5/21 9:09 PM (GMT-07:00)
Subject: Re: Dallas Rangemaster - help
Hello, I'm just wondering if you built this and it worked. I have been making a fx pedals for over 10 years so I know how to check for problems, I also made this on a breadboard too and it wasn't working. I'm wondering if it's the transistor I'm using but I don't think so because I've used this transistor and fuzz faces and it is fine. You used the image in this post and made a working rangemaster? Can I ask what transistor you used?
Gibson RD Artist Sunburst 1977
Built in: 08-nov-1977 (serial: 030) (Manufactured in Kalamazoo)
Marshall VS100 Valvestate Combo