This is a special hand-wired amp by Dr. Z that was built between 2007 and 2012. It is the little brother of the Prescription RX Es, an amp developed in collaboration with Brad Paisley. Quite a bit of info about this amp can be found on Dr. Z's Z-Talk forum.

To me, the amp sounds like a baby of Vox and Dumble: the clear chime of a Vox and the enormously percussive touch sensitivity of a Dumble. This amp can really cut through the mix!

This Prescription Jr – with serial number 002 – has a very well-functioning master volume on the rear, but it also loves to go nice and loud. The amp recently underwent a maintenance check by a professional amp tech and is fully functional.

Important features

• Unique serial number #002: Very rare and interesting for the enthusiast/collector.
• Master Volume: Equipped with an excellent working Post-Phase Inverter Master Volume on the rear.
• Technically 100%: The amp recently underwent a maintenance check by a professional amp technician.
• Overdose Boost: Includes a (non-original) footswitch-operated 3 dB boost for a built-in lead channel.

From the Dr Z website:

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.

The Prescription Junior Strength (Rx Jr.) has all the same sonic characteristics of the RX ES, but at less than half the power. The Rx Jr features a post phase inverter master volume, 3 dB footswitchable boost, EF86 post EQ gain layout, a pair of cathode biased EL84s, and a 5Y3 rectifier. The post phase inverter master volume let’s you maintain all the integrity of your tone with the ability to control the overall output. There is plenty of gain to dial in with the RX Jr. The Overdose function is like having a lead boost built in the amp. The 5Y3 rectifier gives a sweet bloom to the low end. When you don’t need a full dose…the Rx Jr is just what the Dr. ordered.

Specifications:

• Power Output: 18 WattsPreamp Tubes: 2 – 12AX7, 1 – EF-86
• Output Tubes: 2 – EL84
• Rectifier: 1 – 5Y3
• Controls: Volume, Treble, Mid, Bass
• Dimensions & Weight: Head: 19″ W, 9 3/4″ H, 9 1/2″ D; 22 lbs