98 In stock
MM/MC Phono Preamplifier
IWISTAO Moving Magnetic Tube Phono Stage Finished Board M7 12AX7 No including Tubes Transformer
Model No: WMM-PAMA7
This is a finished board of traditional Ma rantz 7 (M7) tube phono stage, and its resistors and capacitors are all HIFI components. This board is a tested and finished board without any tubes and transformers.
Components used: 3W 1% metal film resistor, Hitachi & Chemical high voltage electrolytic capacitor, Sibi + ERO coupling capacitor, WIMA electrodeless capacitor, silver mica small P value capacitor, VISHAY small capacitor, RIFA + Sibi feedback capacitor, gold plated vacuum tube socket.
1. The default debug filament voltage is DC12.6V
2. PCB grade: FR4 Class A board
3. Size (L*W*T): 200mm*150mm*1.6mm
4. Power supply requirements:
a. High pressure: 220VAC, no less than 20MA
b. Low pressure: 12-15VAC, no less than 0.8A
5. Applicable vacuum tube is: 12AX7 * 3pcs
MM phono stage finished board x 1
If you need the kits for soldering and testing by yourself, please click the link below.
Wire Connection Diagram
Learn more about stage amplifier
Phono stage amplifier is designed for a phono signal amplification while using Turntables amplifier inside for special sound equalization circuit (RIAA) for restoring vinyl, it cannot be used for other purposes.
Method for checking noise sources
After phono player connected with the phono amplifier stage, if there is a significant low-frequency noise, you need to check in which part of the noise. First unplug the phono amplifier input signal cable to disconnect connection between them, if the low-frequency noise disappeared or significantly reduced, that may explain the noise from the phono player; obvious if the same or reduce low frequency noise , the noise it is very likely to put itself caused by phono amplifier.
It may cause a greater frequency noise that no specialized non-standard phono ground wire.
Generally, nonstandard phonograph is a turntable part of music center to cope with this set of sound designed, when external phono amplifier put to ground that could cause a large hum due to the different ground ways.
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