15IPS less distortion (30IPS mod)
Note: Mods are not supported! Once you start modding, we cannot offer troubleshooting support. Make sure your unit is working in the stock configuration before adding any mods.
A single resistor sets the amount that the diode ladder will clip the signal. In the 15IPS mkII this is R6, in the 15IPS mkIII it is R7. Increase R6/R7 for more distortion or decrease it for less.
To dial in the exact amount of distortion by ear, replace R6/R7 with a 1k trim pot.
One engineer who uses a pair of 15IPS for mastering sets his R6/R7 to 180R and calls it the "30IPS" mod.
The resistor specifications are through-hole, metal film, 1% tolerance, 1/4 watt.
