Preamplifier Vacuum Tube PRM-X & Phono Stage RIAA-HD MM©

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The Vacuum Tube Preamplifier PRM-X HDS and Phono Stage RIAA-HD MM are integrated in one case and ready to connect other input devices. The innovative design active filter of the system has increased the dynamics of Phono Stage RIAA-HD by ≥15%, by offering dynamic sound in the band acoustic and low noise. Active RIAA design is characterized by consistent performance, regardless of whether it provides minimal or full power. Sound is delivered with absolute authority and high resolution. The lower octaves have better resolution, clarity and dynamic sound for individual accords. The RIAA-HD correction offers a wide bandwidth , extreme results in improved quality of high frequency audibility in considerable details. In addition,it uses fully balanced circuitry from input to output to minimize intermodulation distortion and phase shift. All our tube units have a slow circuit startup,to reduce the life-shortening shock full voltage to the vacuum tubes. Usually of 50 hours before shipment it is connected and again technical and sound tested against project assumptions.It is ready to connect to any amplifier or power amplifier. There is class switch HD / Hi-fi.
We've added a switch to HD / Hi-fi because some old vinyls and turntables can generate Infrasound.
Out RCA REC or Integrated Amplifier has no affect on the signal output via these jacks. Be sure to make appropriate level adjustments at the recording device.
Technical parameters averaged over three measurements: 50, 1000, 2000 operating hours for PRM-X.

It is a purely analog Preamplifier from every input to very output.

Specification Phono Stage-MM HD:
Specification PRM-X HDS:
Switch Fixed Impedance MM: 47 kΩ, 100 kΩ
Signal to Noise Ratio:≥ 96 dB (ƒ= 1kHz)
Input sensitivity Phono MM: 2,0 mV
PRM-X Frequency Response: 10Hz - 65 kHz ± 0,5 dB
Frequency Response: 18 Hz - 56 kHz
THD+N Preamp.: ≤ 0,01 % ( ƒ= 1kHz = Output 1V )
Maximum permissible input ƒ = 1 kHz: 600 mV
Frequency Response Line TRS : 20 Hz - 20 kHz ± 0,5 dB
Input sensitivity: Phono MM 2.0mV⇒max.out.7,8V
Frequency Response AUX, CD, TAPE: 10 Hz - 65 kHz ± 0.5 dB
Output Voltage: max 42,8 V (ƒ= 20Hz)
PRM-X SEPARATION Line TRS: ≥ 66 dB (20 Hz - 20 kHz)
THD+N Phono MM: ≤ 0,015 % ( Out 1V )
PRM-X SEPARATION AUX, CD, TAPE: ≥ 71 dB (20 Hz - 20 kHz)
RIAA Separation: ≥ 60 dB (20 Hz - 20 kHz)
Input sensitivity:Line TRS max 3,8 V
CHannel Mis Match: ≤ 0,1 dB (20 Hz- 20 kHz)
Input sensitivity:AUX, CD max 4,8 V
Switch: HD / Hi-fi
Output Voltage: Rated 2 V, max 39,8 V
HD - Signal to Noise Ratio:≥ 92 dB (ƒ= 1kHz)
Switch - phase inverty
Hi-fi - Signal to Noise Ratio:≥ 79 dB (ƒ= 1kHz)
2 x Mono Analog Volume Control
HD Gain: ≥ 67 dB
VU - Meters analog
Hi-fi Gain: ≥ 42 dB
Switch: Record Monitor
Input : 1 x RCA
Input : 5 x RCA, 1 x XLR unbalanced (pin 1,3, grounded)
Switch power: ON / OFF Phono Stage
Output : 1 x RCA, 1 x XLR unbalanced (pin 1,3, grounded)
Vacuum tubes: 2 x EF86 / EF806
2 x ECC83 / 12AX7
Noise Ratio RIAA-HD + PRM-X out.: ≤ 25 dBm ⇒10 dBm = 10 mW
Vacuum tubes: 2 x ECC83 / 12AX7

Well-filtrated high-voltage power supply - energy saving

Internal power supplies: ∼110V ∼240V, 50 / 60 Hz

Dimensions: 400 (W) x 260 (D) x 180 (H) mm


BAM-HDS special warranty period:

1. In the special edition of models; amplifiers and preamplifiers are covered by a 2-year warranty (except for tubes).
2. Valves - 180 days warranty.
3. During the warranty period, at the buyer's request, there is one free review, measurements and tests.
The rules set out in the warranty service department also apply.



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