But they may mean a germanium Fuzz Face sounds a little different depending on the season and temperature. /CA 1 /Type/ExtGState Sanyo solid organic polymer 22uF electrolytic. /Type/ExtGState The classic 60's/70's soft distortion Fuzz Face pedals (the ones used by Jimi Hendrix) used germanium transistors, but all the parts mentioned above (AC128, NKT275, SFT363E) were a long time ago discontinued. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. There is no source for them anymore and the only solution for builders is to pay astronomical prices for NOS, to buy big batches of similar transistors and try to find if it any left that meets the requirements, and try to avoid the re-labeled, fakes in that journey. This email address is being protected from spambots. endobj 11 0 obj 7 0 obj >> /ca 1 True Bypass: The effect pedal gets completely disconnected from the signal chain once is deactivated. if building a "high gain" ge fuzzface, you can go up to around 300hfe and be fine. After years of experimentation and listening, it is agreed that the best match uses a low gain in the first stage (Hfe=80 approx.) New comments cannot be posted and votes cannot be cast. document.getElementById('cloak1596706def9b282fadcdd2f746892007').innerHTML = ''; This caps will limit the high-frequency response of the pedal and keep under control the hissing noise. Ansonsten spielen die Unterschiede, welche du verbaut hast (470K Poti und 22uF Kondensator) eigentlich keine große Rolle. /CA 1 1 0 obj This has a. It enjoys the most enduring reputation probably due to Jimi Hendrix use and abuse of this pedal. Press J to jump to the feed. By doing this, we will create the same conditions for the transistors as if they were the, The first FF's manufactured in the UK used the AC128, a 45-165 Hfe European germanium PNP transistor, cheap/common at that time (later on replaced by the Newmarket NKT275). Why wouldn’t you use it? Hfe is always quite low in the NKT 275 Fuzz Face; few transistors if any exceeding 70 Hfe. The Fuzz Face Resistors: The original models use 1/2W carbon film resistors. Alpha potentiometers: Using reverse audio for the Fuzz control that gives extra control to the user. /AIS false /AIS false The 1K linear "Fuzz" pot that was standard issue for the original Fuzz Face. The FF circuit is rather simple: 4 resistors, 3 caps, and 2 transistors. By doing this, we will create the same conditions for the transistors as if they were the perfect ones. All the other features (true bypass, LED, quality components, polarity protection, turrets, power supply capacitor, etc) will not change the sound of it and enhance the quality and performance of the pedal. /TK true Reverse log will spread the usable range across the whole travel of the pot. /SMask/None Disclaimer: A fuzz face is not an easy pedal to get a great sound out of! There isn't any low pass filter in the circuit: in the treble side of the frequency response, the line extends flat to the limits of the measuring system. it will be almost an octave pedal. They were manufactured back in the old USSR Soviet days, they are under military specifications that make them good, with a consistent gain and not leaky in current. /CA 1 X��Y�o��_q@mG���~�Mɶ$JQ�>�Ї0/MjE�������#�v���F. /BM/Normal It's interesting to see how the asymmetrical happens hapens first to the positive semicycle of the signal and how extremely distorted can get the fuzz output signal. They just slapped any old ge transistor in. The circuit layout in a pedal with a huge gain like this is critical and the component selection will leave its footprint on the sound. /TK true var addy1596706def9b282fadcdd2f746892007 = 'info' + '@'; /TK true We have created simple manuals to build this project: We also have a YouTube video that guides you during the whole building process: Note: The original fuzz uses carbon-zinc battery (not modern alkaline) and it is claimed to give a better sound performance. It is probably common knowledge by now, but germanium transistors are notably temperature sensitive, a facet that has the potential to make a fuzz circuit using them capricious. I read somewhere that he has low hfe nkt275 in his vintage ones, but I don't know if it's true, they're not the ones he has in his signature model for sure. addy6549dbb6511107e1a7730b7fcc304057 = addy6549dbb6511107e1a7730b7fcc304057 + 'electrosmash' + '.' + 'com'; They are not used anymore because they are considered noisy compared to the modern metal-film resistors. note: In the beginning is difficult to apreciate the change in the input signal because the level is so low that the oscilloscope cannot capture the amplitude change. NKK 4PDT bypass switch. /BM/Normal /Type/ExtGState The Fuzz Face Caps: The original FF uses standard aluminum electrolytic capacitors for the 2.2uF and 20uF values and a film for the 10nF cap. This is true to some extent. stream /OP true Yet Another Fuzz Face. http://s112.photobucket.com/albums/n188/ubersam, Quote from: LucifersTrip on October 09, 2012, 04:40:05 PM, Quote from: Jazznoise on October 09, 2012, 07:01:15 PM, Quote from: Nocaster Cat on October 09, 2012, 06:11:30 PM, NKT275 Newmarket vintage 'Red Dot' Hand Matched  - Germanium Transistor Pairs Available, https://drive.google.com/open?id=0BzMJxNNgY3_yc0JNd0VqdmNIWEk, Quote from: pinkjimiphoton on November 29, 2012, 12:51:32 PM, High priest, Cult of Germanium, and Dudeist Monk. << If you want to know all the details about the circuit, have a look at the Fuzz Face Analysis. I absolutely love the sound of it. /CA 1 >> However, if you like a sound that's more "squishy" and "compressed," I have found that a high gain device for Q2 (150-190) gives a good result with a Q1 in the range of 90-120. After this early germanium years, the production switched to the modern, temperature independent, and more stable silicon transistors like the BC108C, BC109C, and BC209C. stream You need JavaScript enabled to view it. /Length 798 Leakage wasn’t particularly low in these transistors. We'll assume you're ok with this, but you can opt-out if you wish. What transistor hFE(s) for a high gain Fuzz Face? 4 0 obj In this project, we are going to build the perfect Fuzz with all the knowledge and experience that we have nowadays while keeping the tweaks and old character that make this vintage pedal to sound warm, round, and harmonically pleasant. Voltages and bias points within a circuit designed around germanium transistors will vary as the current gain and leakage of those transistors fluctuates. but it won't sound or react like a normal fuzzface. /TK true A problem with Silicon transistors that doesn't seem to exist with Germanium is that they can have too much gain. Leakage wasn’t particularly low in these transistors. This kind of resistors was extensively used on vintage audio equipment. /Filter/FlateDecode Not attenuating the high-freqs makes this pedal so rich harmonically, in the left image you can see all this harmonics when the pedal clips. /SMask/None endobj And a germ darlington pair multiplies leakage x gain... so biasing close to the standard values if leakage is high can be problematic... mac@mac-pc:~$ sudo apt-get install ECC83 EL84, The hfe you read on a DMM etc might/will not be what the hfe is in circuit. << You will have to have an excellent guitar and amp, have played for at least several years, and used some other fuzz pedals to appreciate the sound and feel of our Sun Face or modified Fuzz Faces. 12 0 obj << As we mentioned before, theses perfect AC128 120/80 Hfe transistors were long time discontinued. They are common technologies still easy to find nowadays. Reverse polarity diode:  prevents battery reverse polarity damage. I'd say just build it according to the fuzz face schematic. All the pots and jack are soldered to one of the sides of the board. /SMask/None The 1966 Dallas Arbitrer Fuzz Face has become the holy grail of Fuzz tones. >> One CTS 500K log pot for volume and one Alpha 1K lin pot for fuzz level (that’s what I had in my bin). This category only includes cookies that ensures basic functionalities and security features of the website. /ca 1 9 0 obj Ivor Arbiter took the round shaped enclosure idea from a microphone stand and it was the first pedal including a DPDT stomp-switch. /TK true /CA 1 Why is this? var prefix = 'ma' + 'il' + 'to'; It’s easier for me to switch it off rather than having to unplug the input jack. The gain (Hfe) and leakage current inconsistency of the germanium transistors (the sound signature of this pedal) and the lack of ability/will to use the right components could make a huge impact on the tonal heart. << They are not used anymore because they are considered … /AIS false endobj I used the method described here to measure the hfe's of the circuit, and I got about 25 for Q1 and about 50 for Q2. If you have a Cort guitar and a Crate amp, don't expect to sound like Jimi with a fuzz face. Ergo changes in climate, season, or just the weather will have some impact on the performance of a device. /ca 1 /OP true Necessary cookies are absolutely essential for the website to function properly. Big power supply capacitor (470uF) with low ESR: removes all possible noise from the power supply. Another reportedly good sounding original had a Q1 with Hfe in the low to mid 50s and a Q2 that measured c. 69 Hfe. /SMask/None 2 0 obj well if you use this values, the circuit bias points will look like this: On the left image, the most important bias points are VC1=-0.5 to -0.7v and VC2=-4.5V, these values make the effect to sound fantastic. Ge sound warmer and clips much softer than Si, producing somewhat hi-fi sounding distortion. /AIS false << Re: What transistor hFE(s) for a high gain Fuzz Face? /TK true Press question mark to learn the rest of the keyboard shortcuts. reddit's community for DIY Pedal Builders! Quality PCB:  1.6mm FR4 printed circuit board with plated pads for easy soldering. The first FF's manufactured in the UK used the AC128, a 45-165 Hfe European germanium PNP transistor, cheap/common at that time (later on replaced by the Newmarket NKT275). These cookies will be stored in your browser only with your consent.