Rega Ios Reference - Manual (Page 10)

CONTROLS
THE GAIN SWITCH
The gain setting switch selects the voltage gain of the phono amplifier. Gain I
selects 70dB (switch up) and gain II selects 64dB (switch down), this will
provide an input sensitivity of 61uV and 118uV respectively for an output level of
200mV. It is advisable to start with the lower gain setting II and if necessary,
increase the gain level to I if more level is required for lower output
cartridges. Please note mute or turn the volume control to minimum when
changing the gain setting.
DCΩ RESISTANCE SWITCH
Setting 1 - nominal 6.25Ω (5 ~ 7.5Ω)
Setting 2 - nominal 8.75Ω (7.5 ~ 10Ω)
Setting 3 - nominal 11.25Ω (10 ~ 12.5Ω)
Setting 4 - nominal 13.5Ω (12.5 ~ 15Ω)
Setting 5 - nominal 15Ω (15Ω)
Select the switch for the nearest DC resistance of the cartridge. This
information is usually found in the cartridge specifications. If your cartridge
falls in-between two settings, try both settings and choose the one that gives
the best sonic results. It is permissible to try different DC resistance
conditions as sometimes changing this condition gives a different sonic
performance more suited to your personal taste. The 15Ω
setting is optimised
for the Rega Apheta cartridge.
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