Date: Wed, 19 Nov 97 18:27:15 MET To: analogue@hyperreal.org From: Elessar AKA TR606 Subject: TR606 modifications: what i've come up with so far (2nd try !) for some reason i got unsubscribed from the list so i don't know if my message came through yesterday... anyway, i fiddled around with my 606 this weekend and here are some interesting resistors for people who are planning on modding their 606... more mods will follow later... i'll also put all the mods to my 606 on my web page. (to the person who started a 606-page last week: feel free to put this onfo on your page !) HIHATS: _R224/225/226/244/245/246 these resistors are all located around IC16 (HD14584BP). IC16 is located on the lower right hand corner of the main pcb (under the subboard that contains the leds and buttons), assuming you have the 606 in front of you normally... now, from what i understand from the schematics, the 606 hihats are built up like the 808 hihats, ie. no filtered noise involved, just 6 oscillators. every resistor around IC16 controls the pitch of one of those oscillators. bridging a resistor makes one oscillator's pitch go down, adding a resistor in parallel makes the pitch go up. changing the pitch of one oscillator without changing the other oscillators' pitches can give some very metallic sounds. a 100k resistor, for instance, in parallel with R224/225/226/244/245 or 246 pitches things up way too high for any normal hihat sound. try it ! i got the same results by bridging some pins on IC16. however, when i connected pin 7 with pin 8 my 606 locked up and i had to turn it off and back on... CYMBAL: _R196 bridging this resistor takes away the 'bottom-end' (if any !) of the cymbal sound. from what i discovered, i would say the 606 cymbal sound consists of two layers of sound: a high-end part with a shorter decay and a low-end part with a longer decay. R196 is located to the left of the on/off/volume pot, under the toms subboard. _R215 bridging this resistor takes away the high-end of the cymbal sound. R215 is located to the lower left of the on/off/volume pot. SNARE: _R202/R197 these resistors *seem* to influence the sound of the snare sound. bridging just one ofthem made my 606 snare sound fuller. however, the contacts on my 606 are kind of rusty so half the time bridging things didn't alter the sound... the 606 snare = noise + one oscillator. i suppose everyone knows how to add more noise to the snare sound by adjusting the correct trimmer (...or make it external like i did...). there's also a way to change the snare oscillator's tone. someone else did this on my 606; it works great, but he did have to cut one or two tracks on the pcb. i didn't have to time to write that mod down. i'll post it later... TOMS: _R313 controls the low tom's sound level _R314 controls the high tom's sound level both these resistors are located on the tom subboard, close to the instrument select rotary switch. _R303 bridging this resistor makes the toms retrigger. weird and funny, but not too useful... _R331 this resistor's located on the toms subboard, about halfway between the instrument select rotary switch and the on/off/volume pot. it controls the high tom's pitch. very interesting. adding a 100k resistor in parallel over this resistor pitches the high tom up way high ! _R317 same thing, but for the low tom's pitch... hope this is of any use... bye -- Filip Sneppe sneppe@message.fucam.ac.be http://www.fucam.ac.be/~sneppe "Pedo mellon a minno" "Speak, friend, and enter" "Say: 'friend', and enter" __ J.R.R.Tolkien -------------------- Date: Tue, 25 Nov 1997 21:36:16 +0100 To: sturm@dds.nl From: sneppe@message.fucam.ac.be Subject: http://huizen.dds.nl/~sturm2/ hi, you may remember me as the guy who sent you those resistor values last week. i was wrong on two resistors: (snare) R197 and R202 do not affect the snare sound in any way. so...messing around with them is not a snare mod... sorry for the misinformation...