Transformers ratio: 26 dB
Tube stage gain: 30.5 dB
36.5 dB
42.5 dB
Maximum gain:
Transformers ratio and tube stage gain
68.5 dB with gain switch @ +6 dB
Output impedance: < 500 Ω
Frequency response: 10 Hz – 100 kHz +1.5 dB / – 2 dB
Signal to noise ratio: 80 dB ASA A
Dynamic range: > 150 dB
Output level: 1 VRMS for 0 dB
Harmonic levels: < 0.1 % @ 1 kHz, 1 V out, no load
Crosstalk: > 80 dB @ 1 kHz, 1 V RMS
Filtering:
De-emphasis curves selectable with the FILTERING controller & display: RIAA, TELDEC, NAB 100μS, VICTOR EUR, VICTOR USA
Input setting – MC1 & MC2:
RCA
Cartridge mode: STEREO IN / MONO IN
Load: NO LOAD / 5 / 10 / 15 / 25 / 30 / 35 / 40 / 50 / 55 / 60 / 65 / 75 / 80 / 85 / 90 / 100 / 105 / 110 / 115 / 125 / 130 / 135 / 140 / 150 / 155 / 160 / 165 / 175 / 180 / 185 / 190 / 200 / 205 / 210 / 215 / 225 / 230 / 235 / 240 / 250 / 255 / 260 / 265 / 275 / 280 / 285 / 290 / 300 / 305 / 310 / 315 / 325 / 330 /335 / 340 / 350 / 355 / 360 / 365 / 375 / 380 / 385 / 390 (Ω)
Input setting – MM:
RCA
Cartridge mode: STEREO IN / MONO IN
C load: 0 pF / 47 pF / 100 pF / 150 pF / 220 pF
Input setting – OPTION: Cartridge mode: STEREO IN / MONO IN
GENERAL
Vacuum tubes:
2x E88CC/6922
4x EF806S-Gold
Measured and selected by Nagra Lab
Remote automation:
Input
Output
1x 3.5 mm (1/8”) stereo Jack socket
4x 3.5 mm (1/8”) stereo Jack socket
Input command
Output switching by relay
Home automation:
1x SUB-D9 connector
RS232
115200 bits/s, 8 data bits,
no parity, 1 stop bit
Mains power:
C14 IEC Appliance inlet
100 V~, 115 V~, 120 V~, 127 V~, 230 V~
or 240 V~
NOT ADJUSTABLE
For cable with C13 IEC plug
±10%, 50-60 Hz
Power consumption: 170 W max
Mains fuse:
230V~ to 240V~
100V~ to 127V~
T 2A L
T 3.15A L
FST 5×20 mm 250 V
FST 5×20 mm 250 V
Operating temperature:
+15°C to +35°C
+59°F to +95°F
Moderate climate
Operating environment: Indoor only IP30
Dimensions with VFP: LxWxH
Power supply chassis (HD PSU)
Audio device chassis
Audio device chassis with option modules
installed on the back panel
439 x 438 x 121-130 mm
439 x 438 x 121-130 mm
495 x 438 x 121-130 mm
17.3 x 17.3 x 4.8-5.1 in
17.3 x 17.3 x 4.8-5.1 in
19.5 x 17.3 x 4.8-5.1 in
Weight with VFP (net):
Power supply chassis (HD PSU)
Audio device chassis without option modules
16.5 kg
14.5 kg
36.4 lb
32 lb
The Nagra HD PHONO follows the introduction of the Reference Turntable and Nagra MC-4 moving-coil cartridge. Both the Reference Turntable and MC-4 Cartridge are state of the art contenders in their own rights and proved to be major assets in the finalization and fine-tuning of the HD PHONO.
The HD PHONO is a two chassis design in which the delicate phono stage circuitry is isolated in its own CNC machined aluminum chassis. A second chassis serves to house a massive supercapacitor external power supply. Supercapacitor based power supplies provide all of the advantages of battery-based power supplies with the added advantage of accepting and delivering charges much faster and with higher current load and cycle stability than battery-based power supplies. This power supply is based on those of the HD PREAMP and HD DAC X but features a number of innovations which make it even more silent with improved performance. Both chassis are suspended in a system incorporating a damped, constrained layer platform coupled to four isolator damped towers providing superior vibration resistance
The best of analog is incorporated in the HD PHONO. It is dual-mono, pure Class A with 100% tube stages. In addition, it incorporates remote control cartridge load adjustability from 10 to 390 Ohms, with steps as fine as 5 Ohms for smaller values. This allows perfect matching between your cartridge and HD PHONO stage – all confirmed by ear from the comfort of your listening chair.
The HD PHONO features a new generation of input transformers. Following the original VPS transformer and based on the Nagra IV-S microphone input transformers, the HD PHONO’s transformers are a fourth-generation design featuring 26 dB of gain. The new transformer’s core is made with Cobalt and is cryogenically treated over the course of several weeks to improve performance. The transformer itself is hand wound in a very delicate process requiring watchmakers’ type of skills.
Dual mono / class A tubes
4x EF806S, 2x E88CC
Custom-made input transformers with 26 dB gain featuring cryogenically treated Cobalt cores
Overall gain of up to 68.5 dB adjustable by +/- 6dB so 62.5 and 56.5 dB
RIAA,TELDEC, NAB 100µS, VICTOR EUR, VICTOR USA
2x MC inputs on RCA
1x MM input on RCA
1x option input for future custom transformers
Remote controlled loading system from no load to 390 Ohms by 5 Ohm step
Separate power supply with supercapacitor module ensuring silent power
