Vacuum tube type stereo power amplifier with direct heating triode GM70. Plate voltage 1,050 V, output 30 W+30 W. No-feedback technology creates a three-dimensional effect and a sense of presence, and expresses a clear sound.
Stereo Power Amplifier GM70PA
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Vacuum tube GM70 Equipped with vacuum tube GM70 with Pp=125 W. With a plate voltage of 1,050 V, 30 W+30 W (4 Ω) and 20 W+20 W (8 Ω) output, it can drive low efficiency speakers. ・Two models with graphite plate and copper plate. |
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Two-stage with C3g Equipped with the ultra-reliable C3g, developed by Deutsche Telekom for telephone repeaters. The thin grid lines and large distance between electrodes enable high linearity amplification. The C3g is soldered directly onto the board to reduce noise at the contact point. |
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Large output transformers The large output transformer developed exclusively for this product is installed. Multi-layer sandwich winding drives both small and large signals over a wide bandwidth. Low winding resistance and drive capability, so it has a damping factor of more than 5 despite being a no-feedback amplifier. |
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Dual and bridge mode It can be used as a bi-amp to drive high and low frequencies in dual mono mode with one additional unit, or in bridge mode to drive the output at 1.5 to 2x. ・These modes are available only with XLR balanced input.
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Specification
| Model |
GM70PA-G / GM70PA-C |
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|---|---|---|---|
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Type |
Class-A Vacuum tube stereo power amplifier |
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| Output Power |
Normal, Dual mono |
30 W+30 W (4 Ω, THD5%) |
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20 W+20 W (8 Ω, THD5%) |
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Bridge |
60 W (8 Ω, THD5%) |
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40 W (4 Ω, THD5%) |
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| Frequency Response |
20 Hz-30k Hz -2 dB/10 W |
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| THD |
Normal, Dual mono |
0.7%/10 W |
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0.2%/1 W |
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Bridge |
0.5%/10 W |
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0.1%/1 W |
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| NFB |
None |
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| Signal to Noise Ratio |
90 dB/1 W (20 Hz-20k Hz) |
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| Crosstalk |
40 dB/1 W (20 Hz-20k Hz) |
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| Input Sensitivity |
Normal, Dual mono |
1 V/30 W (4 Ω) |
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1 V/20 W (8 Ω) |
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Bridge |
1 V/60 W (8 Ω) |
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1 V/40 W (4 Ω) |
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| Gain |
21 dB |
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| Input Terminal |
Unbalanced x1, Balanced x1 |
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| Input Impedance |
2.5k Ω/1k Hz |
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| Mode Switching |
By the rear rotary switch |
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| Volume Adjustment |
None |
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| Damping Factor |
2.8 (4 Ω) |
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5.6 (8 Ω) |
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| Power Supply |
AC100/120/200/240 V, 50/60 Hz |
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| Power Consumption |
400 W |
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| Dimensions |
470W×201H×430D mm |
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| Weight |
27 kg |
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| Finishing |
Anodised aluminium |
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| Accessories |
AC cords |
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| Warranty Period |
5 years |
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