Hi erm... Could you make it complete for us newbies here and give us a complete layout with switch connections, input and output jack layout, pots and all?Chris Brown wrote:
verified
Cheers!
Hi erm... Could you make it complete for us newbies here and give us a complete layout with switch connections, input and output jack layout, pots and all?Chris Brown wrote:
verified
It has been told by their engineer, Bruce Botnick, that it was done overloading the tube preamp of their console.DrNomis wrote:I wonder if Robbie Krieger (spelling?), the Doors guitarist, used one of these for the lead break on the studio recording of the song "When The Music's Over"?....
OK. Here's my layout for the same circuit - it's a little different because all the resistors are lying down and I've used modern values. This layout has been built several times, and the results are pretty consistent (within the tolerances of the transistors themselves!).Masuto wrote: Hi erm... Could you make it complete for us newbies here and give us a complete layout with switch connections, input and output jack layout, pots and all?
Cheers!
I've got two of them here. They're built with OC72s. The first one has 110 and 80 for the Hfe of Q1 and Q2 respectively. The second one has Hfe of 135 and 89. They sound pretty much identical, except the lower Hfe one hisses a bit less.lowbrow wrote:A lot of what I've read on gain advice for the Ge Fuzzrite simply doesn't match my own personal real world experience with the transistors they used. The RCA 2N2613 from that era nearly always measure well over 120 hfe (corrected) and 2N408's typically average around high 80's low 90's. Now, I will admit my sample on the 2613 is only about a dozen, and from different dates of manufacture, but my data on the 408 is pretty solid as I've tested hundereds of these from a couple different years of manufacture. I personally shoot for something closer to 150hfe in Q1 and something 90ish in Q2.
Thanks for the info on the transistors. Could you please share some leakage on them transistors or collector voltages with them in circuit? I have tried some different transistors and depending on leakage and gain I have 0.2-4V on q1 and 0.3-1V on q2. I'm trying to get some spirit in the sky tones. That is clean with light picking on G string and heavy distortion with heavy picking on A string.lowbrow wrote:A lot of what I've read on gain advice for the Ge Fuzzrite simply doesn't match my own personal real world experience with the transistors they used. The RCA 2N2613 from that era nearly always measure well over 120 hfe (corrected) and 2N408's typically average around high 80's low 90's. Now, I will admit my sample on the 2613 is only about a dozen, and from different dates of manufacture, but my data on the 408 is pretty solid as I've tested hundereds of these from a couple different years of manufacture. I personally shoot for something closer to 150hfe in Q1 and something 90ish in Q2.
Just saw this, sorry for the delay. I have no measurements from a original germanium Fuzzrite to share (would be nice to know), but I've built a number of them and here's the info on my latest, which sounds just like it should. Hope to have a sound clip next week.skumberg wrote:Thanks for the info on the transistors. Could you please share some leakage on them transistors or collector voltages with them in circuit? I have tried some different transistors and depending on leakage and gain I have 0.2-4V on q1 and 0.3-1V on q2. I'm trying to get some spirit in the sky tones. That is clean with light picking on G string and heavy distortion with heavy picking on A string.
This is what I've read as well. I did a Ge Fuzzrite on breadboard and around that time listened to "Spirit in the sky". Of the fuzz circuits I have tried this one seemed to sound closest to the SITS riff. So whenever I bring out my Ge fuzzrite breadboard I try some mods(changing trannys caps and bias) and play spirit in the sky. Hopefully I will get it even closer since I like that sound and behavior.lowbrow wrote: I was under the impression the Norman Greenbaum fuzz was a one-off custom build someone did for him and not a Fuzzrite, BTW....is that wrong?
hey ho and away we go...Scruffie wrote:Here's a vero layout I did with on board pots - Unverified as of yet.
Fits into a 1590B no problem.
DrNomis wrote:the BC547B Transistor should work fine as a substitute for PN2222, or 2N2222 transistors, you could also try BC548, which usually has an Hfe up in the 300's.....