NVA AP50 Integrated Amplifier
All 6 inputs are identical and hardwired to the selector switch using silver alloy cable with PTFE cover. The output of the switch is routed to the potentiometer and tape socket again with the silver alloy cable. The potentiometer is a very high quality. The signal is then routed to the amplifier PCB again with silver alloy cable. The pre-amp stage is entirely passive. The input to the power amp stage has minimum capacitive and inductive coupling and has been designed to operate correctly with the variable impedance output of a passive pre-amp stage.
NVA AP50 Specifications:
Inputs - Six line level
Outputs - 4mm speaker sockets.Tape out.
Power Supply - 1 x 160 VA
Power Output - 50 W
Dimensions - w430mm x h90mm x d320mm
A current mirror operates at the pre-driver stage to ensure that the voltage rails track each other correctly. The driver stage has both current and voltage amplification using devices that could be used as output transistors. The output devices are 12 amp darlingtons and there are two per channel.
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.
"The AP50 strips away nothing, and I implore you to audition it with rich vocals if you want to learn just what it can do. Arm yourself with some Nat King Cole, Keb' Mo', Johnny Rivers, or Howard Tate to hear the most detailed textures, and Nanci Griffith or Joan Baez to hear unbridled clarity without glassiness. And that's one hell of an accomplishment at the price."
NVA AMPLIFIERS AND SPEAKER CABLES – WARRANTY
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.