The Dan Armstrong Plexiglass was a very odd guitar originally made from 1969 to 1971 as an effort by popular amplification company Ampeg to draw in some more sales than their then-ailing amp lines were. The guitars came about from legendary guitar builder and repairer Dan Armstrong posing Ampeg the question:
â€œSince you make guitar and bass amplifiers, why not also make guitars and basses?â€
Ampeg then asked Armstrong to design some guitars and basses for them to market. The design he came up with resides somewhere between a Strat and an SG, but with a surreal twist: the body was made entirely of a solid slab of Plexiglas (the trade name for a type of rigid, clear plastic) and the scratchplate of a piece of the wood-grain replica pattern Formica, popular on furniture in the 1960s and 70s.
The other very novel and inventive feature of the Dan Armstrong was the electrics arrangement. There was only one pickup â€œslotâ€, at the bridge position. There was no pickup actually installed, but specially designed self-contained pickups were available, a twin blade humbucker or a blade single-coil. All the pickups were contained in the same size casing, but the upside was that the two types of pickups could be slotted in very easily and with no complex modification required. There was also an inbuilt volume boost circuit.
There were a couple of clear upsides of the Plexiglas Ampeg, which was available as a guitar or bass. The solid Plexiglas body had a lot more sustain than most other guitars available at the time, new pickups could be slotted in easily with the radical circuitry, and the Plexi body just looked refreshingly different. However, it was also very heavy, and more difficult to make than wooden guitars. Ampeg and Dan Armstrong parted ways in 1971, and the guitar was no more. However, the model has been reissued and is currently available. Ampeg also do cheaper versions made of mahogany or swamp ash.
The guitars have been most famously used by Dave Grohl of the Foo Fighters and Keith Richards of the Rolling Stones.
Current prices for originals are high, and the 1970s models are rare. The armies of 1970s Ampeg copies by Ibanez and Shaftesbury are also rare and collectable, but prices for the reissue start at Â£450-ish for the wooden ones, and the Plexi reissues are about Â£1000.