Ge temp stabilizer mod and bias.

[ZtaRDuZT]

Is the Ge temp stabilizer changing bias on a fuzz circuit?
Tried to breadboard a fuzz with Ge diod reverse bias across b-e yesterday.
Looks like collector voltage on Q2 changes when I put the diod in.
Is it supposed to do that? Do I need to bias the circuit after I put the diod in?

I thought nothing would change except making the Germanium tranny more
resistent to temp changes. I biased my circuit before I put the diod in.

[puretube]

http://www.diystompboxes.com/smfforum/index.php?topic=37570.0
http://www.diystompboxes.com/smfforum/index.php?topic=37944.0

[ZtaRDuZT]

The first article talks about the gain reduction of a ge diod across b-e in a circuit, as described in the brit-face article.
The second Talks about the temp stabilizer mod, reversed biased ge diod across b-e, also from the brit-face article.
I couldn't find any answer to the question wether or not the reversed bias diod is supposed to chang bias.
Am I missing something?
I've already read those posts before, I searched the forum for answers to my question before I asked, but I
read through them again, just in case, but I can't find an answer to my question. Maybe I'm missing something.

[formerMember1]

this would be good to know for me too, since i am going to add one to my Rangemaster, and i hope it doesn't change the biasing, since i built the pedal on a terminal strip and there is not much room anyway, 

Anybody noticed a change in biasing after adding a Ge temp stabilizing diode? 

[ZtaRDuZT]

I breadborded a fuzz, checked the collector voltage on Q2, 4.2V. When I added a Ge diod it dropped to 1.2v.
After searching the forum trying to find info on this subject I went back to the breadboard and tried again.
4.2v becomes 4.0v when I add a Ge diod. I guess I got a bad reading the first time, I'm not sure what happened,
it's sometimes tricky to get good readings.

It seems you get a slight drop when you add a Ge diod, it's supposed to stabalize bias and that's probably
just what happens.

[formerMember1]

that is probably why no one replied 

BUt in this case that is a good thing, since you/we found our own solution to our problem, and learned with "hands on" expierence. 

I too have to check my readings twice sometimes, it happens

[puretube]

maybe the link(-s) shoulda pointed from the other threads to here, to attract attention...?

[formerMember1]

sorry puretube i didn't mean it that way, i should have said, That is probably why not many people replied, and that is cool we/you solved our own problem, sometimes you learn better that way,

I appreciate your help puretube...hope no harm was done 
I didn't mean it that way,

[ZtaRDuZT]

Feels kinda good to fix your own mess for once, with a little help from puretube that is.

Saw now that there's actually 3 topics in virtually the same area but I didn't want to
hijack your topic formerMember1 so here we are! ****edit**** Oooops, wasn't your thread!****


BTW, I breadboarded the Rangemaster today and had minimal drop when I put the diod in.
Went from 6.92 to 6.90, nothing. I'm going for the Ge stabilizer mod. I've got the Rangemaster
and Arbiter setup for soldering, just need to work up the nerve to finish them off.
I don't want to miss anything, gotta go over the board a couple of times just to see everything
is OK. 

[formerMember1]

yeah man, good luck 
Make sure you check things with your DMM before you solder to make sure that parts aren't mixed up from breadboarding. 

Also, write down what parts/ values you used, so that way there is no confusion later, in case something doesn't sound right.

[formerMember1]

Hi i got a problem,...

I want to add the ge diode to my Rangemaster, but it is built on a terminal strip epoxy glued into a hammond mxr style box, so there is no way to get at the biasing resistors.  becuase when i add the ge diode, it changes the biasing for me,( i talked about this in another thread a while back but can't find it)

My reason for rebringing this up is i was wondering if i could add the diode, and then add another biasing resistor to the pedal?

Like say my pedal is biased at 7.02 volts, i then add the diode and it changes the biasing to 7.64 volts or 8.00 volts or 6.50 volts(can't remember what value it changed to)  I already have a biasing resistor from lug 1 to lug 4 and another from lug1 to lug 3.  So can't i just add anotherbiasing resistor from L1- L3 or from L1-L4, to "fix" the biasing?  (probably under 1K) 



otherwise i am sunk, the pedal just keeps changing all day long