Dear Amimbari, Duffy49, Modern Growl, M0ses and Toastfuzz; thank you so much for your informative, honest and thought-provoking feedback. It is deeply appreciated, believe me.
The Phat II EQ unit is now in the innards of my bass player's Washburn XB125
. After several rehearsal sessions and live gigs, it continues to function as it should, i.e. boosting the volume/highs/lows; sans noise. Case closed.
Amimbari, that's a nice preamp you have in your GSR200. Neat layout and soldering. Perhaps you could share the circuit diagram with us? Just a suggestion
Toastfuzz, I will definitely check out the SR400's active circuitry if they have one on display at Kuantan Music (the only guitar store here). Thanks for the info.