Thanks for the compliment on my channel! Best way to see what im doing here, is to go to the MB pdf file and check the schematic. i believe these are the correct 'stock' values (68k and 3.9k / Rb & Rc). I think the idea is that you want it to hit the saturation cause thats when the transistor will start clipping, the best part of a germanium transistor boost imo! :)
im curious for when i build my rangemaster based 100% based on the original schematic. if i just follow the schematic do i have to do any of these other tweaks? ussally when i build pedals i dont bias anything , i follow the schematic and its ready to go
Awesome video! Another way of doing this would be to simply utilize a trimpot in place of the resistor, allowing for quick biasing once the build is completed. Always socket your tranny! :)
isn't the Rangemaster a potential divider biased 1 transistor amp with much higher value resistors than 5 / 100k in the POT DIV - what were the resistors you were altering?? (RC and RE) I'm a bit confused about the ideal bias point - for max' headroom one would expect to bias the collector near the middle of the supply voltage (~4.5V). If biased like this wont it hit the end stop more quickly? Any idea of the typical pk-pk voltage swings for a Rangemaster ? (sorry for sounding thick)
I just made a Arbor Dallas trouble booster and there is a small volume drop when I engage the effect. Does anybody have any ideas as to why? I did use a substitute transistor. Could that be the problem? Is there any way to boost the volume on these trouble boosters?
![[TH] 2024 PMSL SEA W2D3 | Summer | ไม่อยากเหนื่อยวันเสาร์ ก็ต้องจัดเต็ม](http://i.ytimg.com/vi/CbsHmoJXjvE/mqdefault.jpg)
This was very, VERY helpful and comprehensive, as I have never attempted to bias a transistor, simply because I was totally unaware of the concept.
Thanks for the compliment on my channel! Best way to see what im doing here, is to go to the MB pdf file and check the schematic. i believe these are the correct 'stock' values (68k and 3.9k / Rb & Rc). I think the idea is that you want it to hit the saturation cause thats when the transistor will start clipping, the best part of a germanium transistor boost imo! :)
thanks, I think you did a pretty good job of covering the basics ... at least enough to get me started
im curious for when i build my rangemaster based 100% based on the original schematic. if i just follow the schematic do i have to do any of these other tweaks? ussally when i build pedals i dont bias anything , i follow the schematic and its ready to go
Awesome video! Another way of doing this would be to simply utilize a trimpot in place of the resistor, allowing for quick biasing once the build is completed. Always socket your tranny! :)
isn't the Rangemaster a potential divider biased 1 transistor amp with much higher value resistors than 5 / 100k in the POT DIV - what were the resistors you were altering?? (RC and RE)
I'm a bit confused about the ideal bias point - for max' headroom one would expect to bias the collector near the middle of the supply voltage (~4.5V). If biased like this wont it hit the end stop more quickly? Any idea of the typical pk-pk voltage swings for a Rangemaster ?
(sorry for sounding thick)
great video thanks a lot! ive bought a load of russian trans based on your advice and this has helped loads too! keep up the awesome work.
I am wondering if all germanium transistors should be biased to 7v or just the one that is called for in that build?
Just for that build. Tone Benders are a good example of where you do different voltages per transistor stage.
Which resistors are R1 and R2? I am guessing R1 is the 68k in original rangemaster and R2 was the 3.9k?
Yeah... I also thought the bias was set by the voltage divider R1 & R2 i.e. the 68k and 470k resistors across the base of Q1?
I just made a Arbor Dallas trouble booster and there is a small volume drop when I engage the effect. Does anybody have any ideas as to why? I did use a substitute transistor. Could that be the problem? Is there any way to boost the volume on these trouble boosters?
Yes you should not have built a trouble booster, it only gives you trouble 🙂
@@qddk9545 it's because I didn't have it biased properly. It works great now.
@@cameronstolhand7149 You didn´t understand the fun - it is called a treble booster 🙂
Hfe?