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Piggybacking trannies.
Posted: Wed Mar 13, 2013 6:26 am
by Bieling2
Has anyone here tried this?
1. Take two identical random silicon transistors (for more mojo: your fav fuzz silicons)
2. Tie the BASES together,
3. Cut off one COLLECTOR
4. connect a 3k to 6k resistor between the EMITTER of the collectorless device and the EMITTER of the other transistor.
http://tagboardeffects.blogspot.com/201 ... anium.htmlDoes anyone have picture of how the resistor is connected between the two emitters of the transistors? Has anyone tried using a 10k pot between the two emitters and have pics of that, and how either method is then connected to the rest of the circuit?
Re: Piggybacking trannies.
Posted: Wed Mar 13, 2013 12:51 pm
by eatyourguitar
I made a graph that explains it.
http://i47.tinypic.com/x200at.gifso piggy backing will decrease your gain (hfe).
Re: Piggybacking trannies.
Posted: Wed Mar 13, 2013 7:35 pm
by Ben79
Can this be done with germs too?
Re: Piggybacking trannies.
Posted: Wed Mar 13, 2013 11:20 pm
by eatyourguitar
in my opinion its pointless since high gain germanium is so hard to find. taking a germanium transistor Hfe 100 and dropping Hfe down to 50 does not have too many applications except maybe a range master.
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 8:20 am
by Ben79
Just wondered cos I've got a load of ac125s that are all over 200, some over 300. All test good for leakage on a DCA55. Was thinking of piggybacking them in a Supafuzz.
Is there a circuit that likes stupid hi gain germaniums?
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 10:42 am
by eatyourguitar
sell them to me! I will find a use for them. maybe a pnp muff? please don't waste them by dropping the gain down to 100 Hfe. I have recently noticed that the world is running short on good germanium transistors. the next generation of pedal builders might not have access to germaniums much at all.
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 1:27 pm
by Ben79
A germanium muff sounds interesting but aren't the diodes doing most of the clipping in one of those? I like the effervescent high end on a muff but have always attributed it to the silicon inside. If it seems wrong though, even more reason to do it!
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 2:57 pm
by rustywire
Thread title misleading...
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 3:05 pm
by Chankgeez
rustywire wrote:Thread title misleading...

Yeah, I expected behndy to be all up in here like nobody's business.
Re: Piggybacking trannies.
Posted: Thu Mar 14, 2013 9:59 pm
by eatyourguitar
Ben79 wrote:A germanium muff sounds interesting but aren't the diodes doing most of the clipping in one of those? I like the effervescent high end on a muff but have always attributed it to the silicon inside. If it seems wrong though, even more reason to do it!
high gains are part of the sound. you could use all germanium diodes for even more mojo. I really want to make a pnp muff with at least one MP16B in it. the gains on my MP16B are Hfe 100 max so I dont want to use 4 of them. they do however have a really bass heavy response so a MP16B in Q2 would be really cool mixed with other high gain PNP germaniums.