Proton 520B stereo amplifier - dark grey :

Features : 1984 vintage 20W amplifier

No remote control

Low profile stereo amplifier with similar appearance to NAD equipment

Proton are a 45+ year old Taiwanese worldwide OEM electronics producer who also manufactured NAD equipment, Proton components in general, use superior quality components

Matching analogue Proton 420 tuner now listed

Well tested prior to listing, really good on headphones output

Controls cleaned and phono preamp tested with good results

No tone controls : this is where the NAD minimalist designs started, only better

Specifications : Vintage : 1984 model Power : 20W RMS at 8 ohms with THD distortion 0.015% Clipping power : at 8/4/2ohms : 26W / 35W / 39W Dynamic headroom : at 8ohms/4ohms/2ohms : 46W / 78W / 100W Damping factor : >300 Phono : MM moving magnet preamplifier Frequency response : 20 to 20kHz ±0.2dB Power bandwidth at THD 0.1% : 10Hz to 60kHz High level input resistance / capacitance : 15kOhm / 220pF Line input sensitivity : VIDEO / tape play: 150mV, phono MM: 2.5mV Residual noise : 0.3mV Channel crosstalk [1kHz] : 65dB Signal to noise [A-weighted] : Tape / Aux: 96dB, Phono MM: 87dB Phono input resistance [MM] : 47kohm Phono overload [MM] at [20Hz / 1kHz / 20kHz] : 20mV / 200mV / 2.0V Phono THD at 4.5V output [MM] : 0.03% RIAA response accuracy [MM] : ±0.2dB Speaker outputs : A only Tone controls : none Dimensions [ W x H x D ]: 420 x 87 x 280mm Weight : 5.2kg - packed weight ~ 7kg