AMZ FX ANALOG ALCHEMY GEOFX MEF ROG MEF DIY WIKI

Any use for a 2N6520 PNP?

Started by Will.mendil, February 28, 2014, 05:14:51 PM

Previous topic - Next topic
Print
Go Down Pages 1 2 3
User actions

italianguy63

#20
March 03, 2014, 06:40:18 AM
Sent.  If you use the spreadsheet I sent you-- just get the resistors "close."  Input the actual values into the formula.  The spreadsheet does all the math.

MC
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

Will.mendil

#21
March 03, 2014, 07:50:33 AM
Got it. That was quick thanks! Do I follow the circuit from my previous post?
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

italianguy63

#22
March 03, 2014, 07:58:19 AM
Yes.  That is what I use too.
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

Kipper4

#23
March 03, 2014, 09:05:50 AM
I cant remember but i think i either tested the resistor with the DMM or put in a trimmer (5k) and wired it as a variable resister then set with the DMM.
Ma throats as dry as an overcooked kipper.


Smoke me a Kipper. I'll be back for breakfast.

Grey Paper.
http://www.aronnelson.com/DIYFiles/up/

Will.mendil

#24
March 03, 2014, 04:16:12 PM
I only got a small 10k. Guess it ll have to do. I'll try it now and see how it goes.
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

Will.mendil

#25
March 03, 2014, 05:23:08 PM
Ok got it to work. Tough circuit :p I got 75 and 83 hFE what does that tell you? Am I looking for more or less
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

Will.mendil

#26
March 03, 2014, 05:24:17 PM
Yeah 85 on average
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

Will.mendil

#27
March 03, 2014, 06:03:21 PM
Everyone gone to sleep already?:p
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

italianguy63

#28
March 04, 2014, 04:42:19 AM
Will--

It just depends.  You need to see what you are building, and research what you need.  Some circuits want high Hfe, while others want low Hfe.  Some want no leakage, where others need some.  Regardless-- any Germanium with leakage above 300 should just probably get tossed in the trash as it is probably near failure.

As an example-- if you are building a Fuzz Face (as I usually am).  The magic Q1 value is around 70 to 85 Hfe.  And, for Q2 you need more gain-- like 110 to even 140 Hfe.

Anyway, from my experience -- 85 Hfe is a good #.  Very much in the middle.  I've seen ranges from low 30's to about 250's.  Most in the 50's to 60's (for the part#'s I select).  It depends on the particular part # too.  Anyway-- consult a transistor spec. sheet for the ranges.  Then, test them because Germanium (actual vs. specification) are all over the place.

MC
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

Will.mendil

#29
March 04, 2014, 05:09:03 AM
Might not have been clear but 2n6520 is silicon isn't it?

Do you java examples of odd exotic pedals that could use this as the fuzz face is a bit done over and over again. I got a pretty good sounding fuzz on its way. So I'm more looking for old vintage "hybrids" in which a 2n6520 could substitute
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

italianguy63

#30
March 04, 2014, 05:13:51 AM
I'm sorry, I don't know.  I live in my own little niche.  I almost exclusively play with fuzzes with Germaniums.  I hunt down Germaniums, test um, and use um...

Maybe someone else here with more knowledge can chime in...
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

Will.mendil

#31
March 04, 2014, 05:19:23 AM
Well in that case. Test question. Where to get relatively cheap ge transistors that could be shipped to Europe without the out stating postal fee
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

Will.mendil

#32
March 04, 2014, 05:19:41 AM
In other words. Not USA
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

italianguy63

#33
March 04, 2014, 06:38:10 AM
I guess eBay unless someone else here may have specific vendors over there.  I personally have gotten a big bunch of Russian surplus Germaniums from Russia, and also some very nice GE 128's from E. Europe...
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

LucifersTrip

#34
March 05, 2014, 04:25:50 PM
Quote from: Will.mendil on March 04, 2014, 05:09:03 AM
Might not have been clear but 2n6520 is silicon isn't it?

yes...and 85 seems good, right in the Hfe 20/100 range.
http://transistor-spravochnik.ru/description/2n6520/5969

Quote
Do you java examples of odd exotic pedals that could use this as the fuzz face is a bit done over and over again. I got a pretty good sounding fuzz on its way. So I'm more looking for old vintage "hybrids" in which a 2n6520 could substitute

just pick a vintage silicon fuzz and these will most likely work with minimal tweaking...Fuzz Rite definitely or even a SuperFuzz or Big Muff (I've done all 3 with hfe <100).   A more obscure one would be the Sunn Buzz, which is a favorite...a Jen Fuzz, Knight Fuzz, 1 of the 2 transistors in a Heathkit Fuzz or Jordan Bosstone, Astrotone, etc..
http://www.luciferstrip.com/fuzz/sunnbuzz-schematic.jpg

really, there's just too many vintage si fuzzes that can be built with those
always think outside the box

Will.mendil

#35
March 05, 2014, 04:27:49 PM
It doesn't have to be a fuzz :). But thanks  I'll check them out
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

Will.mendil

#36
March 05, 2014, 04:28:17 PM
When you say minimal tweaking. What are you thinkin about?
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/

bluebunny

#37
March 06, 2014, 03:52:16 AM
Quote from: Will.mendil on March 04, 2014, 05:19:23 AM
Where to get relatively cheap ge transistors that could be shipped to Europe without the out stating postal fee

Check out alexer1 (Ukraine) and minifux1 (Germany) on the Bay.  I've used both.  Prices can be fairly reasonable.
  • SUPPORTER
Ohm's Law - much like Coles Law, but with less cabbage...

italianguy63

#38
March 06, 2014, 04:30:39 AM
I got some nice AC128's from eBay "elebcz" (Czech Rep.)-- but haven't had a chance to try them yet.  But, the #'s were right.
I used to really be with it!  That is, until they changed what "it" is.  Now, I can't find it.  And, I'm scared!  --  Homer Simpson's dad

Will.mendil

#39
March 06, 2014, 05:18:53 AM
Cool. Last noob question, which ge transistor should I be looking for , apparte from ac128?
Don't know what to do with a paritculare transistor? Check this website where stompbox pedals are listed by what transistors they use

http://scfxguide.wordpress.com/
Print
Go Up Pages 1 2 3
User actions