Good condition, 6,5/10, has 2 mismatched 12 speakers but sounds great (if you crank it you might blow a speaker though.), one speaker is a Jensen Alnico (50W) dated 41st week of 1968 and the other is an modern Jensen (40W) dated 43rd week of 2014, the Schumacher transformer is dated 25th week of 1979The amp has just been serviced by our tech and this is what he did; rewired to correct mains voltage, replaced power switch, installed bias trimmer, replaced screen grid resistor, checked the tubes and replaced the 12AT7, tested OK for functionfrom Premierguitar.com: The 135-watt version of the Fender Twin Reverb (Photo 1) was produced from approximately 1977 through 1982. These amps were a bit different from their 100-watt silverface predecessors, notably because they used an ultra-linear output transformer. These transformers had an extra pair of leads tapped from the primary windings and connected directly to the screen grids of the output tubes. This type of output stage had previously been used mostly in hi-fidelity tube-amp design, and supposedly provides less distortion and better frequency response.