Epiphone Valve Junior



The Epiphone Valve Junior is a small 5 watt class A electric guitar amplifier.

Specifications

 * Available as an 8 in speaker combo version or as a head only version.
 * 11 Ply Birch Plywood Construction
 * $5 W$ RMS
 * Volume Control
 * Power Switch
 * 1 Input, 1 Channel
 * 1 × 12AX7A Preamp Valve/Tube
 * 1 × EL84 Power Valve/Tube
 * Single-Ended Class A Cathode Bias Design
 * Solid State Diode Rectified
 * Weight: 20.9 lbs
 * Dimensions: 14.6 x
 * Made in China

History
The Epiphone Valve Jr. version 1 combo was released in 2005 as a part of Epiphone's line of amplifiers. In January 2006 a head version was released and also a version 2 combo. In June 2007 an updated head version and a version 3 combo were released. The first Epiphone Valve Juniors (version 1) were only combo amplifiers and received only a fair reception, due to such problems as buzzing and hum caused by the AC filament voltage. Epiphone then released a head version, correcting these issues and changed the AC filament voltage to DC voltage. Version 2 combos also featured these modifications. The version 1 and version 2 combos feature an 8 in $4 Ω$ ceramic speaker.

Epiphone released Combo version 3 and a newer version of the head with higher retail prices and feature a variety of tube brands based on availability including Electro-Harmonix, JJ, and Sovtek. The newer versions of the head and version 3 combos feature updated transformers with 4, 8, and $16 Ω$ outputs and the version 3 combos feature an 8 in $16 Ω$ Eminence Lady Luck speaker. In 2007, Epiphone released a speaker cabinet that can be used with the Epiphone Valve Junior, featuring a 12 in $16 Ω$ Eminence Lady Luck speaker rated at $70 W$ RMS.


 * Combo version 1 has front panel stripes that run along the centre of the front panel and has a $4 Ω$ output only and an AC filament voltage.
 * Combo version 2 has front panel stripes that run along the top of the front panel and has a $4 Ω$ output only and a DC filament voltage.
 * Combo version 3 has front panel stripes that run along the top of the front panel and has 4, 8, and $16 Ω$ outputs and a DC filament voltage.
 * Head only versions have 4, 8, and $16 Ω$ outputs.
 * Early versions mainly have Sovtek tubes and later versions have a variety of tubes such as JJ, EH and Sovtek tubes.

As of summer 2012, these amplifiers appear to have been dropped from the line. The amplifiers page no longer exists on the Epiphone website.

Modifications
The Epiphone Valve Junior has become very popular to modify because of its basic design. There are many websites, kits, and forums dedicated to this purpose, including the Epiphone official amps and accessories forum. Some sites offer kits to match the gain characteristics of Marshall, Fender and Vox amplifiers. These kits often do not include a bridge rectifier to convert the version 1 AC filament supply voltage to DC, instead they suggest twisting the AC leads together to cancel the generated electromagnetic fields, a technique used in twisted-pair Ethernet cable to eliminate crosstalk.

Valve Junior Hot Rod
A somewhat limited edition of the Valve Junior head was produced by Epiphone, dubbed the Valve Junior Hot Rod. It was released as a response to the extensive number of modifications that were being applied to the regular Valve Junior. The circuitry was altered to include a second 12AX7 preamp tube, a gain control, and a spring reverb in addition to the single volume control, as well as a standby switch to preserve tube life. Thanks to a dual function jack on the amp's rear panel, the Hot Rod can also be used as a standalone reverb unit to be used in conjunction with another amplifier's input or effects loop. In this function, the gain knob becomes the unit's dwell control, the volume knob retains its level function, and the reverb knob becomes the mixture control. When used as a reverb unit, the Hot Rod does not need to have a speaker connected to its output jacks because an internal "dummy load" activates automatically when the Reverb output jack is used.

Serial Numbers
The first 4 digits of the serial number are the date code MMYY (MM = month, YY = year). Version 2 Valve Juniors have date codes starting at "0106" January 2006 up to June 2007 when version 3 was released.