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Originally Posted by soul&folk  Can you help me out here? Which preamps are you using? What kind of cables?
I was trying to send signals from the balanced outputs of the Electro Harmonix 12ay7 preamps with basic TS cables and that caused a hum. |
It looks like the 12AY7 preamp may not have an insert jack, which would help. According to the product page, EHX is claiming that shorting the ring to the sleeve should work (using a TS cable in the balanced TRS jack of the 12AY7), but if it is not working for you, you options are to get a different preamp, don't use the RNC on the 12AY7, or use some sort of adapter/transformer to balance the signal
Some good info here:
Sound System Interconnection