12/31/2022 0 Comments Ampex 351 input transformer![]() ![]() They plug into an octal tube socket. Push-pull output with negative feedback from a special O/P transformer winding Same input transformer as the 601, comparable to UTC A-11 "rec calib." control is hidden inside the chassis If used, the pad should be rebuilt with low noise, metal film resistors. 1977 article by Harold Lindsay about the beginnings of Ampex in the December 1977 db. Some paper/wax, some ceramic disc audio capacitorsīalanced line input is a pad on the mic input. ![]() The input transformer was made for Ampex by several companies. It uses miniature noval tubes like the venerable 12AX7, printed circuit boards and lots of negative feedback. The Ampex 351 is also highly thought of for use as a mic preamp. A vast amount of music was recorded on these professional tape machines. Users of SUTs take note! All transformers including SUTs can be used to receive the cartridge signal in the balanced domain.The Ampex 351 is a classic American tape recorder from the 1958. Ampex ATR-100 Input/Output Interface Module, Recapped, Tested, Works Well. But balanced lines can be executed with single-ended gear if good transformers are used. NOS Ampex 4040414-100 Brake Band For Ampex 300 350 351 440 Recorders, For. Now it is a fact that if the phono circuitry is fully differential that there is additional benefit (for example in our phono sections only two stages of gain are required to work with a LOMC cartridge run straight in- you get theoretically 6dB less noise per stage of gain). The advantage of running a cartridge balanced is of course to minimize any artifact from the cable- meaning an inexpensive cable can sound just as good as one costing 2 or 3 orders of magnitude more! Its arguable that this is the one place you really want to get it right! ![]() Similarly if an input transformer is used with a LOMC cartridge (and the transformer is properly loaded to prevent ringing) then the tonearm interconnect will have far less effect on the sound of the system. You might say that the balanced line system itself was the exotic cable industry prior to Robert Fulton creating his first ’Fulton cable’ back in the late 1970s. This was long before an exotic cable industry existed. This allowed the tape machine to have microphones a good 150 feet from the machine with no degradation of the mic signal. The input used an input transformer as well. Its internal circuitry is entirely single-ended except for the push pull output it has driving its output transformer to drive a 600 Ohm balanced line. The Ampex 351 tube tape electronics were used to record a great deal of classical and jazz recordings done by RCA and the like. Balanced shmalanced.unless all your components are differentially balanced, you will not get the improved performance. ![]()
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