NVA AP10H Headphone Amplifier
This is the least expensive amplifier in our range, built purely for headphone listening and will provide the very highest musical reproduction. Please confirm your headphone type at time of ordering.
NVA AP10H Specifications:
Inputs - One line level
Outputs - Headphone jack for high impedance (modern) headphones
Power Supply - Frame type
Dimensions - w250mm x 65mm x d205mm
This amplifier is designed to provide an extremely high quality dynamic headphone stereo output from a standard 1/4 inch jack. The unit should remain powered-up indefinitely for best sound -- power consumption is minimal. Connect a CD player to your AP10H and marvel at what you've been missing with your headphone listening up to now.
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.
There is a single stereo RCA line-level input for a dedicated single source which is hardwired to the volume control potentiometer using silver-plated cable with a PTFE cover. The potentiometer is a very high quality cermet type 100K ohms linear, with 10K ohms metal film resistors acting as bypass to simulate a log law. The signal is then routed to the amplifier printed circuit boards, again hard-wired with silver-plated cable. The use of a cermet pot means that there can be surface noise from the volume control when it is rotated, which is normal. Cermet track is not as smooth as conductive plastic film or carbon track but has a far superior sound quality, or less effect on the signal, depending on your viewpoint.
The input to the amplifier stage has minimal capacitive and inductive coupling, and has been designed to operate with the variable output impedance of the potentiometer.
The power supply is based around a small frame transformer with a 6 amp bridge rectifier, and four different capacitor networks in order to filter the power supply at progressively higher frequencies to create very smooth low-impedance power supply rails.
The case design has been created for sonic reasons with the case sides bonded together with acrylic weld and the top plate with structural adhesives to avoid the magnetic contamination of steel screws. No ferrous materials are used, only four screws for the cover, so the case's constituent parts are glued together to prevent induced circulating currents as well as high frequency and high voltage static charge problems associated with normal designs. The concept extends to gluing the circuit boards, power supply caps, and diode bridge to the thick anodized aluminium baseplate. All high current wiring is via heavy gauge uninsulated copper wire to avoid dielectric effects. The case is unvented.