Fender Twin - Wikipedia
Fender Twin Reverb Silver Face: a classic amp, used by The Beatles, If you want to join the club and get yourself a Fender guitar amp, you know .. METHOD 1: DATING FENDER AMPS USING THE TUBE STICKER The amp on the left was wade in (February) and the other in (July). If you want tube amp breakup and smoking tones with no pedals you will experience Below is a 65 Blackface Twin Reverb with its Oxford 12T6 speakers . Early Fender Electric Blackface amps from and some into early FENDER AMP Chassis Serial Number DATE CODES . Twin 5F8, 5F8-A (tweed).
Beware of the weight, though. The plate voltage will increase a little when two of the tubes are removed. Ideally you should have the amp re-biased to not run the two remaining tubes too hard. But the delivered current is doubled with four tubes.
Hence, the power is also doubled. This mod is a must-know survival trick for all Twin owners. These tubes have different frequency responses than 12AX7, particurlarly when distorting. People describe these tubes to have less harsh and buzzy distortion. This mod does not alter the tone significantly when amp is played clean or when only the power amp section distorts.
Fender Twin Reverb: Guitar | eBay
Pull out the V1 normal channel preamp tube — More preamp gain in vibrato channel. It is so easy to enable and disable that it can hardly be called a mod. This is the preamp tube for the normal channel which you are not using when playing the Vibrato channel. This mod is safe. It has stood the test of time and been been done by players in 50 years in blackface Fender amps.
Very practical mod at practice and low volume environments. If you pulled the V1 12AX7 tube you may use it as V6 phase inverter. Reverb is an important character with vintage amps, yet so individual and mysterious. We all know that speakers change their tonal character during age. So does the reverb. Some amps have long, lush and soft reverb while others are mushy and overwhelming. We often find the reverb sweet spot around 2. Some amps are sensitive and difficult to control the reverb on.
The whole dynamic area can be within a narrow interval, i.
These amps require a careful touch when dialling in the reverb, which irritates us. The reverb circuitry consists of two tube sections reverb driver V3 and reverb recovery V4 and the physical reverb tank. If you replace the V3 12AT7 reverb driver with a 12AU7, you will reduce the effect of the reverb and it will be much easier to control with the reverb knob. So simple as that. Use normal channel for reverb control — Adjust EQ and depth of reverb.
This mod is relevant only for two-channel amps with normal and vibrato channel. Plug your guitar into the vibrato channel, then unplug the reverb return cable on the back of the amp the one that comes from the reverb tank output and plug it into the normal channel input.
BF/SF Twin Reverb
The reverb knob on the vibrato channel will have no effect any longer. This mod is not applicable together with the Pull V1 mod, as you need the normal channel preamp tube. The effect of this mod is similar to pulling the V1 normal channel preamp tube when playing the vibrato channel. This mod suggests to entirly disconnect the tremolo circuit from the signal path by replacing the tremolo intensity pot with a switchabe pot spst.
One side effect with this mod is a noticable click and a volume difference between tremolo on and off using the new spst pot.
The spst pot is not good for enabling and disabling the tremolo very often because of the click and the volume difference but is a nice when you play without tremolo. A good thing with this mod is that you have both the tremolo pedal and spst pot to use. We like this mod a lot for stratocasters wi the Fender ABsimilar circuits since they boost a relatively scooped and thin sounding guitar and amp. In addition to pulling the V1 tube, this mod is one of those must have mods which we never undo once having implemented it.
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This mod can be implemented in two ways, either by unsoldering the tremolo circuit or replacing the tremolo intensity pot with a swicthable pot, so-called SPST pot. The switch is enabled when you turn down intensity to zero. Order a 50k SPST from one of our recommended amp part dealers. Remove the original 50k trem intensity potmeter by unsoldering the wires to the potmeter lugs and unount the pot from the chassis.
The black plastic wheel is to be used for the new pot. Install the new 50k SPST pot to the chassis. All Twin Reverbs feature a solid-state rectifier. The controls have black-skirted knobs numbered from 1 to The Normal channel has two inputs, a "bright" switch which compensates for loss of brightness through the volume control when the control is set lower than about "6" on its scalea volume control, treble, middle and bass tone controls.
The Vibrato channel has a duplication of the same controls as the normal channel, plus the addition of reverb, vibrato speed and intensity controls. The vibrato bug is a four-wire device consisting of a neon tube and light-dependent variable resistor, packaged in a short section of black tubing.
It resembles a water bug, with slender wispy legs. The tube generated vibrato oscillator pulsates the neon light, which varies the resistance on the resistive element.
That variable resistance is applied to the audio signal on the Vibrato channel, creating a pulsating increase and decrease of that channel's volume.
The speed controls varies the rate of the oscillator. The depth control limits the amount of application the variable resistor has on the audio signal. The front panel also has a bright red pilot light lens better known as "pilot lamp jewel" for its multiple triangular-shaped facetscovering the pilot light made by the Chicago Miniature Lamp Co. Other colour schemes amber, white, green, purple and blue are also available.
Rear panel controls include a 2. Units made before the takeover of Fender by CBS in will be marked Fender Electric Instruments, and be worth a bit more on the collectors market.
Twin Reverb amplifiers came standard with "tilt back legs" which allowed the amplifier to be tilted at an angle backwards, so the speakers faced at a more upward angle, promoting better distribution of their output to an audience when placed on a low stage. Silverface Twin Reverb[ edit ] In the Fender amplifier line switched from the original black faceplate to a new brushed aluminum faceplate with light blue labels except the Bronco, which has red and changed the color of the grillcloth from silver grey to silver with sparkling blue threads embedded within it, ushering in the Silverface era.
Other blackface cosmetic features were retained. Since the tube complement was the same, Fender just used up their stock of printed tube charts saying AB until they ran out. Early silverface amplifiers made between and had black lines on the brushed aluminum faceplate, still retaining the '60s "tailed" design on the amp logo, installed on the upper left side of the grillcloth.
This feature was offered on models produced prior to the "tailless" period in Some later models came with an unusual silver grillcloth with sparkling orange threads "orange sparkle" ; a black grillcloth was even fitted on some production runs.
During the silverface period, the Twin Reverb's chassis and AA circuit was shared by the Dual Showman Reverb, effectively producing the Twin Reverb in a head form, although the matching speaker cabinet for the Dual Showman Reverb sported a pair of inch JBL speakers rather than inch. In a master volume was added, then in late '73 it was fitted with a push pull "boost" or acentric potentiometer in the master volume position.
The rating of the amplifier's output power was upgraded to watts and between — an ultra linear output transformer was used, increasing the power to watts.
A Hum Balance was added at this time Twin Reverb II[ edit ] In the Twin Reverb II was introduced to compete with Mesa Boogie's very successful products; it had an output rating of watts and a return to Blackface era cosmetics albeit with a different, channel-switching cascading gain circuit with a more modern mid-range voicing and without the 'traditional' vibrato.
The circuits for this series of Fender amplifiers were designed by amp guru Paul Rivera; the 60w Concert amplifier was by far the most successful in terms of sales, but all models in this range and the next are now becoming highly sought-after by collectors and players.
It featured a dual output switch, allowing the user to select either 25 watts or watts of output. Earlier Twin Reverb amps were known among musicians to be best suited for loud, "clean" tones.
The "Red Knob Twin" was made until ; During it was slightly modified and the knobs were changed from red to black, keeping the same shape. It has since been succeeded by the first version "Twin Amps" of Fender's Protube line in All subsequent models and reissues have used PCBs.
Fender "Red Knob" Twin '95 Twin Amp[ edit ] This version has Blackface cosmetics, two inputs, no vibrato, two channels with gain select on the floor pedal to give it two sounds per channel and an effects loop. This one also has a switch for a Low Power 25 Watt mode.