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樓主 |
發表於 2019-4-16 17:53:06
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By modularizing voltage amplifying section, the merits of manual wiring and shortening of paths have been realized. By placing 3 system decoupling capacitors quite near each module, high purity signal loops could be formed in each stage.
Compactly arranged 211 output tubes and the near heater peripheral section are placed at very near the amplification unit so that from the first stage tube to output tube base could be stowed in a compact space eventually minimizing the wiring travel to the utmost limit. The 211 heather circuit is mounted with large capacitors (40000uF x2) to minimize ripple elements while residual noise level could be attained quite low thanks to employing hum balancer circuit.
Between amplification stages we employed newly developed electrode oscillation proof silver foil capacitors contributing to the improvement of sound density.
Instead of conventionally used EI core choke coil, we have developed cut-core type anew for drastic improvement in sound quality natural and strain-free by having removed unpleasant signals.
Kagura’s pure silver coiled output transformer handles output impedances of 4, 8 and 16Ω. By selecting positions at the speaker impedance switch and change relevant jumper plates, speaker impedance switchover is done with NFB level always set to our designed level –3dB. |
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