ART VOICE CHANNEL MODS

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Warning!!!: Art uses VERY small traces that can be easily damaged by improper soldering techniques. Take extra care with these units!

Tube MoD: - Replace the tube with a better quality 12AX7 tube (mullard, tung-sol, rca, whatever)

IC MoD: - Replace ic's u5, u6, u100, u103, u104, u201, u202, u203, u206, u306, and u309 with gold contact ic sockets and change the chips to: lt1358, opa2132, opa2134, or LME49860NA (My fav)
- Replace ic's u103, 104, 201, and 206 with 14 pin gold contact ic sockets and change the chips to: MC33079, LME49740NA, OPA404, or OPA4227
- Replace u105 with THAT 2180AL08-U (lift pin 4, pin 4 should not connect to anything)

Capacitor/resistor MoD: - Replace c19 and c20 with 100u 100v bipolar caps
- Bypass those with 1u 100v film caps
- Replace c8, 9, 32, 36, 49, 50, 102, 111, 120, 210, 211, 213, 214, 221, 222, 230, 231, 232, 303, and 304 with 22u 35v bipolar caps
- Bypass those caps with .22u film caps
- Replace c3, 29, 30, 31, 32, 200, and 201 with 220u 10v bipolar caps
- Bypass those caps with .22u film caps

- Replace r29, 31, 32, and 33 with 10 ohm metal film resistors
- Replace r148, 154, 159, 166, 227, 229, 253, 254, 255, and 256 with 100 ohm metal film resistors
- Replace r68 with a 150 ohm metal film resistor
- Replace r183 with a 332 ohm metal film resistor
- Replace r122 with a 1k metal film resistor
- Replace r242, 243, 244, and 245 with 1.5k metal film resistors
- Replace r165 and 211 with 2k metal film resistors
- Replace r62 with a 2.4k metal film resistor
- Replace r46 and 47 with 6.8k metal film resistors
- Replace r101 with a 7.5k metal film resistor
- Replace r11, 12, 17, 70, 116, 117, 156, 157, 158, 233, 235, and 277 with 10k metal film resistors
- Replace r123, 170, 174, 211, and 217 with 20k metal film resistors
- Replace r240? and r241 with 22k metal film resistors
- Replace r43 with a 100k metal film resistor
- Replace r60 and 72 with 243k metal film resistors

Disclaimer: These mods were derived from old notes. Please double check all actual resistor bands and cap values before replacing with suggested values.

PSU MoD: - Change the diodes D1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 23, and 24 to Fast (UF) diodes. UF4007's will work.
- Bypass the V+ and V- with .1u film caps
- Bypass c22 with a .1uf 250v film cap
- Bypass the modded IC's V+ and V- (pins 4 and 8) with a .1uf capacitor to ground
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Disclaimer: I encourage people to DIY and I'm here in a informative role.
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Here are some images:
                 

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ModDefecation is about making equipment sound better, providing knowledge and support, repairing that awesome piece of gear, and custom builds. Send me you questions or Ideas.