It is quite difficult to change the V72/78 circuit over to a DI box due to the impedance/frequency dependent feedback network that is needed for disk type input x-former. Sure you can disconnect the input x-former and just hook to the grid of the EF804/806s but than you loose 6db/octave above 9K and also the longer connection to the grid increases the S/N ratio to an unbearable -60dB. One of the biggest problem with low tech modified historic V72 units. Considering the fact that the V78 is guaranteed -90 dB self noise, it would be a shame just to place a toggle switch and switch from x-former to 1/4 inch. In order to switch the x-former to 1/4 inch, in the V72S we use a 5 decked switch with help of a dual relay to make all connections like feedback resistor and feedback capacitors, grounding, etc. the switch by itself is about $50 and the wiring about one hour. My decisions to keep the V78 affordable outweigh this additional feature, and than most of our V72S users got a V71 so they could dedicate both channels of the V72S as a mic pre. I hope that helps your questions. Best regards, Oliver |
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