PCB empty board M7 Marantz 7C line bile preamp, QJ007 old cat revised tube preamp board

Coil Number:Autotransformer
is_customized:Yes
Phase:Single
Usage:AUDIO

[PCB blank board] Double-sided copper clad laminate, RF4 1.6MM thick, 1 ounce copper, through short circuit pads, can support 6Z4 or 6X4 two rectifiers
Imitation Marantz 7 M7 pre-finished products
A generation of legendary classic machine Marantz 7 gallbladder preamps, with its mellow sound, sweet and natural mid-range, and bold taste back to infinity, attracting thousands of enthusiasts who are struggling to pursue this sound! After several revisions of this store, the Marantz 7 gallbladder pre-stage successfully launched the finished machine. The sound quality is surprising! Friends who like vocals and guts may wish to give it a try, the treble is delicate and not harsh, the midrange is warm and the bass is soft without underpowering, and there will be unexpected effects!
The vocals are natural, delicate, and the strings are smooth and stretched. The more you listen, the more you listen to it. The sound field is very vigorous. Every instrument is played seriously. The positioning and knotting are perfect. It is very connotative, and there is no point at all. Many people say that the Ma 7 intermediate frequency is good, and the high and low ends are not good.
High-quality double-sided PCB specifications: 148 * 220MM
Power supply: 250V-0-250V 80MA
     0-6.3V 1A
     0-13V 1A