Also, if you didn't know, they have applied this to all previous videos EEVBlog did a good vid about it.

Your welcome

So, in the case of either, it's not that they add, but rather, they multiply leakages. However, it isn't a "straight multiplication" either. But this is why a silicon germanium pair works great, because a leakage of near 0 from the silicon can greatly reduce the leakage of its germanium in the set. The reason we go more with PNP Germanium is because they were more common, and they lasted longer than their NPN counterparts. Most NPN Germaniums that you find now are either leaking too much or their gains are abnormally low, which is why they were B stock transistors in the first place to become NOS.

For a Solasound TB MKII Pro, there is a little bit of fiddling required, but nothing too ridiculous. The first thing to note is the first transistor (input stage). It will likely have a resistor that connects to the base of the transistor and goes to ground. It is a resistor to divert excessive base-current which is caused by leakage from the base to the collector a Germanium transistor. On PNP Germanium Transistors, like the AC125, AC126, AC128 or OC81D, the value of the resistor should be around 100K. However, if using an OC75, it should be reduced to around 10K. The first transistor, usually you are targeting a 50-70 hfe transistor that is slightly leaky. Something like between 100μA and 400μA. The second transistor needs to be at around the same gain, so 50-70 hfe, but you want it to be the one with the least amount of leak. Try to have it under 100uA if possible. The third and last transistor is the one that needs the higher gain, somewhere between 100-125 hfe, and it should be slightly leaky as well, between 100μA and 400μA. When the ToneBender was being developed, they took leak into consideration into the design.

@@erikvincent5846 GREAT info! Thank you. This will be a big task for a first build.

@@frederickshelborn6911 Let me know if you need help. I have an unreleased PCB called the Clone Bender. It builds a Tone Bender MK2, plus several other PNP Germanium based fuzzes and has an inverter onboard. If you are in the US, just hit me up and I can send you one, along with the build doc.

Yeah, that's not going to work very well.

Could it be that you have used you fingers to insert the transistor and it hasn't temperature stabilised yet? Or maybe your power source is sagging?

@@paulepruss thank you . it's a basic 9v battery.

@@xplorer3475 I'm no expert, just learning like you but - It's a simple set-up so check all of your components for the correct value. Re-seat all of your components in the breadboard and/or try a different transistor to see if the voltage stays steady. try soldering or using jumper clips to connect the circuit to rule out the bread board. Try to find a 120/240vac to 9vdc power pack to give you a constant 9vdc source. Good luck!

@@paulepruss i observed that the difference between with and without 2M2 remains the same, whatever the oscilation goes to. so it means : checking each voltage quickly thanks to the switch, then do a substraction, and then you have the total gain.

multimeters don't have anything for hFE, and for Germanium it would be tricky as leak calculations are needed to subtract from the measured hFE. But, as shown in the video, you can measure leak and gain with a multimeter and breadboard and subtract.

@@erikvincent5846 My multimeter has 2 sets of 4 holes labelled, ECBE for NPN and ECBE for PNP. I guess they make them that way to accommodate all sorts of pin outs. Anyway, I only ask because I have a germanium transistor that I wish to use and the multimeter says it has a gain of 90, which would be pretty awesome if leakage wasn't a factor in germaniums. ;) I'll have to dig out my old breadboard and see

@@JM-ym8mm ah, I think I might have seen chip/component identifiers that have that. I haven't seen any of those that take leak into consideration, though. Not saying they don't exist, but I haven't seen them before. I did make an Arduino circuit that does do that, so it is possible. We made a video about that a bit ago.

@@erikvincent5846 indeed I think you are correct. I would assume that they build multimeters with today's silicon chips and transistors in mind, which don't have the same leakage issues I believe. It would make sense for them to ignore it seeing how the germanium transistors we buy nowadays are new, old stock. Thanks for replying, was good picking someone's brain about it!

Nope. On screen capturing, just an SM58 with a pop filter straight into my Scarlet 2i2 interface. From there, into Bandicam. Otherwise, if using the Sony Cam, it's just that.

Maybe try a de-esser. You’ve got quite the whistling ‘s’ going, there.

@@buzzcrumhunger7114 on the Bandicam screen capturing or on the regular garage cam scenes?

Erik Vincent I dunno about Bandicam, my daughter insists OBS is better but can’t tell me about plugins. I don’t know what your post editing process is like, but wherever in your chain you would use plugins. It’s loudest in the 1st section with the DMM, but noticeable in the graphics presentation section as well. That’s about as far as I got.

@@buzzcrumhunger7114 I can look into it. Might be a plugin within Sony Vegas.

I think so. Although the Fuzz Factory has 2 stages of Germanium transistors after the Silicon IIRC.

If a I could a speak a da English!