NVA A40 Mk2 Monoblock Power Amplifiers

The NVA A40 Mk2 is a compact hi-fi amplifier designed purely for the best and most satisfying musical reproduction. It is small and compact but will deal with difficult loads due to the size of the heat-sink used as an integral part of the case design. The difference compared with the Mk1 A40s is this heat-sinking capability which meant a case redesign.

NVA A40 Specifications:

  • Inputs - One line level per channel

  • Outputs - 4mm speaker sockets per channel

  • Power Output - 40w

  • Power Supply - 100va

  • Dimensions - w240mm x h130mm x d170mm

The A40 is a pair of 40w power amplifiers designed to be used with a passive pre-amp like the NVA P50 or P90 but will work OK with active pre-amps or direct feed from a DAC or computer audio system with volume control. It should only be used with NVA low capacitance speaker cable and NVA low capacitance interconnects. Use of other speaker cable invalidates our warranty.

Warranty is for two years parts and labour and after that a further three years it will be repaired on a no profit / cost basis.

Available in 120v or 240v please stipulate on purchase.

NVA A40 Monoblock Amplifiers - Front

NVA A40 Monoblock Amplifiers - Rear


Only NVA LS1, LS2, LS3, LS5, LS6 and LS7 is recommended for use with this amplifier, other cables will invalidate the warranty. 

For best sound the amplifier should be left powered up. Electricity consumption is very low. It is for this reason that the power switch is located on the back panel, where it may not be easy to reach. Turn the amplifier off when you do not intend to listen to it for extended periods.

NVA amplifiers are unique, and one thing that makes them so is the minimal compensation for the output stage. It is very possible to send this amplifier into oscillation by connecting too large a capacitive load on the output, the usual culprit being unsuitable speaker cable such as Litz or Goertz type constructions.

If you insist on using other cable (this will invalidate warranty) please ensure it is no more than 200pf per metre and it should not be used in lengths over 10 metres. If you wish to Bi-Wire this can only be done with NVA cable and they can be made that way on order for a small added cost.

For design performance only NVA Sound Pipe, Super Sound Pipe or Sound Cord Interconnects should be used, but this is for sonic as opposed to safety reasons.