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In Reply to: RE: Bad Advise !!!!! posted by Vinylly on October 31, 2009 at 16:37:16

I have never lifted the cover on a M3, but have looked inside AI Modulus II quite a bit. Rather than use a rotary selector, they use relays. The tape selector is closest to the tube active stage. Using this input just passes the signal through less contacts.
If it sounds very different than a normal input it must be loaded different. The volume control is the load for the other inputs. I think it is 50k whether a pot or stepped attenuator. Some M3 models had a pot, I think all M3A had SA.
There may be a series resistor in the tape input that is making the sound hard. Changing the 3dB point from the input capacitors. Or another loading resistor on just that input.
If you own a VOM, try measuring. Select the CD input and measure from hot to ground on the RCA Jack. Then select tape in and the do the same. If they measure the same, they SHOULD sound the same.

George

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