The Legend, hvis du trodde Gaku On var veldig dyrt, det er ingenting ift disse.
Alle får navn etter musikere.
Da de er modulære kan man bestille hvilket utgangs rør man hvil, f.eks. 845, 211, 212D, DA100, 300B osv.
Her Julius Katchen som var en pianist fra USA.
“The circuit design on JK mostly references the Gaku-On. A simple and direct balanced signal is first input through the input transformer, then through the VT25 direct heating triode valve for primary amplification, and then through a 1:1 intermediate stage transformer, coupling to the output stage, directly driving a pair of parallel amplified 211 direct heating triode power tubes, and then transmitted to a super large output transformer.
The only passive components on the entire signal path are two non-magnetic tantalum film silver wire resistors. There are no signal capacitors, so the circuit is simple and clear!
The input transformer accurately and smoothly passes the music signal transmitted from the pre-stage, so it can eliminate any possible signal interference. The input transformer core is made of Mumetal and wound with silver wire. The precise winding technique makes the positive and negative nodes of the balanced transmission signal completely symmetrical, which can completely eliminate any hum or noise. The JK uses a special coil winding technique, where the primary and secondary coils are almost perfectly coupled, so the secondary coil does not require any resistive damping, and the grids of the VT25 and 211 valves can be simply cross-connected by the magnetic field generated by the silver coil.
Similarly, the JK’s intermediate stage transformer uses more silver wire that that wound on the Gaku-On’s larger C Cores… Andy especially emphasizes that the power of this 5% upgrade should not be underestimated, because it fundamentally changes the crystal structure of the alloy, which in turn makes the production much more difficult. They worked closely with the transformer factory on the production, and adjusted the alloy heat treatment procedure both through data analysis and listening experience. All adjustments were based on the replay of music. … The resultant music signal has excellent extension on high and low frequencies, and the balance of the full frequency is also excellent.”
Sist redigert:
