Vintage Simms Watts AP100 Mk2 100w Valve Amplifier MKII Circa 1972

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As famously used by Mick Ronson and David Bowie circa 1972.

The headbox is original but has obviously had a makeover at some point. It should be really easy to revert it back to the period correct cosmetics if you wanted to.

Professionally serviced in 2017 and is still in perfect working order. Really sweet clean tones with no issues at all.

The transformers are definitely original and possibly made by "Allen". The bias cap has possibly been changed.

Note - The filter caps are likely original and well over 40 years old, but there are no signs of leakage from the seals, and the amp runs really well with no signs of noticable hum. You might want to get these changed for better reliability from the amp. Apparently they should be changed every few years or so.

It looks as though the valves were running hot at one point but given that they’re in different positions from where that could have happened (they would have been together at one end), I suspect that was fixed in the 2017 service.

I've included the gut shots so that you can look it over yourself.

Price not set in stone, make me an offer.

Can ship worldwide, please contact me for a postage quote. Will be extremely well packed, see my feedback.

"David Simms ran a shop called the Musical Bargain Centre on Ealing Road in London, near both Jim Marshall's original store and where Monty Python would film many classic scenes. In 1968, Richards Watts was named technical director of the shop, and the Simms-Watts brand was born. It's notable that Rick Wakeman worked at the shop while studying at the Royal College of Music, and John Entwistle would drop in to rehearse with him (Entwistle would later endorse Simms-Watts, amidst stints with Hiwatt and Sunn amps, as well). It's additionally notable that Terry Marshall, son of the late Jim Marshall and the "T" in the JTM line of Marshall amps, also joined Simms-Watts in 1968 after a falling out with his father. Like most competing retailers, Simms-Watts sought to outfit the entire band with amplification, from guitar and bass to keyboards and vocals, and they began offering some extremely high-quality products in 1969. They designed two instrument amps, the AP (All-Purpose) 100 and 200 Super models, as well as multi-input tube-powered PA mixers, using only extremely high-quality Fane or RCF speakers in their cabinets.

These amps used massive transformers, and ran their tubes at an incredible plate voltage of over 600 volts in Ultra-Linear mode, gaining as much clean headroom before distortion as possible. By utilizing this ultra-linear circuitry, created an even louder, cleaner amp at higher volume levels. After my brief experience with the AP100, it might just be the PERFECT amplifier for fuzz pedals, not only due to the clean headroom, but it's warmth... these are ultra-clean amps, but far from sterile. Their tube warmth and optimal input circuitry can take the edge off a Fuzz Face or Tone Bender while allowing the fuzz to breathe, and guitar & pedal to interact without interference. Bowie was rumored to have used it for his 12-string acoustic/electric." -

Product Specs

Excellent (Used)
Excellent items are almost entirely free from blemishes and other visual defects and have been played or used with the utmost care.learn more
Brand Simms Watts
Model AP100
Categories Guitar Heads
Year 1972
Made In United Kingdom

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Bygone Tones

Wigan, United Kingdom
Joined: Apr 2014

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