The Epiphone Valve Junior is a small 5

watt The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James Wa ...

class A

electric guitar An electric guitar is a guitar that requires external amplification in order to be heard at typical performance volumes, unlike a standard acoustic guitar (however combinations of the two - a semi-acoustic guitar and an electric acoustic gui ...

amplifier An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It may increase the power significantly, or its main effect may be to boost the v ...

Specifications

*Available as an speaker combo version or as a head only version. *11 Ply Birch Plywood Construction * 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: *Dimensions: *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 ceramic

speaker Speaker may refer to: Society and politics * Speaker (politics), the presiding officer in a legislative assembly * Public speaker, one who gives a speech or lecture * A person producing speech: the producer of a given utterance, especially: ** In ...

. Epiphone released Combo version 3 and a newer version of the head with higher retail prices and feature a variety of tube brands based on availability including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 Electro-Harmonix (also commonly referred to as EHX) is a New York City-based company that makes electronic audio processors and sells rebranded vacuum tubes. The company was founded by Mike Matthews in 1968. It is best known for a series of gu ...

, JJ, and Sovtek. The newer versions of the head and version 3 combos feature updated transformers with 4, 8, and outputs and the version 3 combos feature an Eminence Lady Luck speaker. In 2007, Epiphone released a speaker cabinet that can be used with the Epiphone Valve Junior, featuring a Eminence Lady Luck speaker rated at RMS. *Combo version 1 has front panel stripes that run along the centre of the front panel and has a 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 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 outputs and a DC filament voltage. *Head only versions have 4, 8, and 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 Ethernet () is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 198 ...

cable to eliminate

crosstalk In electronics, crosstalk is any phenomenon by which a signal transmitted on one circuit or channel of a transmission system creates an undesired effect in another circuit or channel. Crosstalk is usually caused by undesired capacitive, induc ...

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 12AX7 (also known as ECC83) is a miniature dual-triode 6AV6 vacuum tube with high voltage gain. Developed around 1946 by RCA engineers in Camden, New Jersey, under developmental number A-4522, it was released for public sale under the 12AX7 ident ...

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 ( = month, = year). Version 2 Valve Juniors have date codes starting at "{{mono, 0106" January 2006 up to June 2007 when version 3 was released.

External links