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  • Vintage 1970s Sound City 50 Plus Mark 4 Valve Amplifier
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Vintage 1970s Sound City 50 Plus Mark 4 Valve Amplifier


Out of stock


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Vintage 1970s Sound City 50 Plus Mark 4 Valve Amplifier

Vintage 1970s Sound City 50 Plus Mark 4 Valve Amplifier

If you’re looking for a legendary amplifier, without the price tag, this is the amplifier for you – a 1970s (1971 to be exact) Sound City 50 Plus. These are truly amazing, especially being 50w for lower volumes. This particular amplifier has had the output transformer changed out in 2006 for an ARW transformer that fits well. The EL34 valves have been changed to JJs, and the ECC83s are an eclectic mix of Yugoslavian, Groove Tubes, and an original Brimar. The original knobs have been changed in the past. As for condition, it is very good indeed. There are a few scuffs and scrapes throughout, as pictured, but really nothing significant. A wonderful amplifier that will certainly not disappoint!

Please check out the in-depth pictures below as these form part of our description.

This amplifier has been serviced to a playable & safe standard, by one of our leading amp techs. To find out more about what our service includes, please check out our terms and conditions before purchasing.

At The Music Locker we will do all we can for you to get the instrument you want. You’re more than welcome to come and have a play on this, coupled with one of our vintage guitars!

Additional Information

Country of Manufacture




Sound City





For more information on shipping prices, please visit our shipping page.

The Music Locker prides itself on offering vintage and collectable pre-owned instruments and equipment (the Products).

We take all reasonable steps to ensure the equipment has been inspected by a competent person in the UK to ensure it complies with UK safety standards. This may mean it does not comply with the current standards in the country in which it will be subsequently used. It is the purchasers’ responsibility to ensure it is inspected by a competent person knowledgeable with the relevant electrical safety standards within that country, prior to connecting to any live electrical circuit.

It is the philosophy of The Music Locker to keep all items as original as possible, only changing original components when absolutely necessary. This includes valves, capacitors, transformers, potentiometers, frets, etc. This gives the buyer the option of tailoring to their exact needs, and may mean that the item is not operating at optimum performance levels. Therefore, your personal preference may differ, depending on your circumstances (i.e. collector or musician), and you may decide to service the item in more depth upon receiving.

The Music Locker cannot accept responsibility for any costs of refurbishment to a standard different to the one advertised.