Eroica Phoenix70 control amp
Price unknown (around the mid 1960 s?)
Commentary
Separate amplifier Phoenix70 control amplifier.
It is composed of a 2-stage NF amplifier so that the output voltage can be large.
It is equipped with the ascending point switching type tone control which Eroica commercialized for the first time in the world in the EW-50, and the turnover frequency can be switched between high four stages and low four stages.
A CR type equalizer is used.
The power transformer used is a completely sealed and completely shielded transformer manufactured by tamura Manufacturing Co., Ltd., and all vacuum tubes are DC ignited by bridge rectification using silicon diodes.
Aluminum chassis is used for the chassis.
Model Rating
| Type | Control amplifier |
| Input sensitivity | phono1, 2 : 1 mV tape head:0.5mV Tuner, aux : 70 mv ~ 2 v tape in:200mV |
| Output voltage | Output : 0.5 V ~ 20 V tape out:300mV |
| Equalizer | CR Type phono:RIAA Tape : NARTB 9.5cm/s, 19cm/s |
| Tone control | F. C. C. method High pitch : 2.5 kHz, 5 kHz, 7.5 kHz, 10 kHz Ascending low-frequency : 62.5 Hz, 125 Hz, 250 Hz, 500 Hz Also, Fall. Flat. position |
| Signal-to-noise ratio | -90dB(IHFM) |
| Frequency characteristic | 2 Hz ~ 76 kHz + 0 -1dB |
| Undistorted maximum output voltage | 20V(0.3%) |
| Distortion | 0.5 V ~ 10 V (0.1% or Less) |
| Other | P. U. load switching (50k, 22k) Tape monitor switch Aux, tuner level set Output level set |
| Vacuum tube used | 12AT7x2 Pieces 12AX7x2 Pieces 12AU7x4 Pieces |