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Croft Acoustics Series 7 R Mono Power Amplifiers (Pair)



We believe Croft Acoustics products to be the most understated, best value for money amplification on the audio market. Glenn Croft has over 35 years of experience refining truly innovative valve circuits. All products are hand-built in the UK with meticulous point to point wiring backed up with a 2 year warranty (6 months on the valves/tubes).

The Series 7 Power Amps are designed similarly to Glenn Croft’s classic output transformerless valve circuits with one leg of the MOSFET going directly to the speaker terminal. The Series 7 range are hybrid in design using improved circuitry over the previous Polestar/Twinstar range of amplifiers with no biasing of the valves needed. R stands for Regulation and gives more grip and control over the whole frequency spectrum. An extra transformer is employed to manage the regulation circuit. The 45 watts on offer sound significantly more powerful than a lot of mainstream brands 50 to 100 Watt amplifiers and have a better more natural tone than your everyday 2A3 or 6550 valve amplifier.

The Series 7 Power Amps are designed to work with the Micro 25 Pre-Amplifiers and compliment each other perfectly. Both Pre and Powers are phase-inverting.

Priced per pair of Monoblock Amplifiers.

We are happy to deal with overseas enquiries and to ship internationally to Countries without dealer support.


  • Valve compliment:  1 x ECC99, 1 x ECC83 and 1 x 85A2
  • Frequency Response:
  • Sensitivity:
  • Input Impedance:
  • Power Output:  45w RMS into 8Ohm
  • Power Consumption:  20w idle, 240w max
  • Dimensions (WDH):  405 x 270 x 70mm each
  • Weight:  6kg each