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Check out this super cool 2004 Dr. Z Prescription ES w/Overdose - one of the very first ones made when this amp came out to replace the original RX. It features the Overdose boost function, but note, it is NOT foot switchable (though easily modded if one so desired). This one is in Very Good+ condition with minimal tolex dust and a few scratches on the metal corners. Includes a nice padded head cover.
Here's what Dr. Z has to say:
The original RX was always a controversial amp design with its highly percussive response, “in your face” drive, immediate attack, and high level of pinch note harmonics (as demonstrated on “Dead City” featuring Buddy Whittington.)
A collaboration between master Tele player Brad Paisley, and master amp builder Mike Zaite has given birth to the all new Prescription Extra Strength. The new “RX ES” is completely revised from the input jacks to the output jacks and shares no circuits with old RX.
The RX ES design structure is unique for a Z Amp as it uses an EF -86 pentode set up in a post EQ gain layout. This alignment yields a rich harmonic complexity and an almost active response from the tone stack. The RX’s dual calibrated inputs allow for sustaining gain in the Hi input, and a rich warm clean in the Lo input jack. The RX ES also features a footswitchable “Overdose” mode, which engages a 3 dB boost for added drive and gain without altering the preset tone, same EQ’d tone just much more DRIVE.
Dr Z’s old friend (and avid supporter of Z Amps since 1989) Joe Walsh demo’d the RX ES and ordered one on the spot to use on the Eagles Oct ’04 tour of Japan. Look and listen to his Blonde RX ES on new Eagles’ releases, and upcoming shows.