Vintage 1970s Marshall Model 1964 "Lead & Bass" 50W Head

Up for sale is a rare piece of Marshall history: an original 1970s Marshall Model 1964 Lead & Bass 50-watt head.

If you are looking at this, you likely already know how special these mid-70s JMP heads are. This factory hybrid gives you the best of both worlds in one chassis: Channel 1 is voiced to the aggressive, biting specifications of the Model 1987 Lead, while Channel 2 is voiced to the warmer, fatter Model 1986 Bass circuit. Bridging the channels delivers the ultimate vintage, non-master volume rock crunch with incredible depth.

Condition & Specifications:

• Model: 1964 Lead & Bass (50 Watts)
• Power Valves: 2 x EL84
• Preamp Valves: 3x ECC83
• Transformers: Original
• Circuitry: Original Specification, No Mods.
• Serviced by Southern Amp Services as follows -
• Parts
• 2 x bias filter capacitors, sprague atom
• 2 x PA/Phase inverter coupling capacitors, malory
• Work done:
• Replaced faulty capacitors
• Cleaned onboard fuse and holder
• Rewired mains plug
• Rewired live & neutral inside amp as neutral was going through the fuse and not the live!
• Cleaned valve pins and bases
• Tested valves - OK
• Cleaned speaker selector plug
• Cleaned speaker output sockets
• Cleaned all potentiometers
• Biased output valves
• PAT test done
• Cosmetics: Excellent original condition, includes cover

Tone & Performance:
The amp sounds absolutely massive. It behaves exactly as a classic vintage Marshall should—dynamic, highly touch-sensitive, and incredibly loud for a 50W head. Perfect for both studio tracking and live use.