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Tape Trail Reel to reel, cassette and other analogue tape formats. |
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Tape Trail Reel to reel, cassette and other analogue tape formats. |
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In Reply to: Re: Thanks for the update on the Seduction posted by Doc B. on February 7, 2006 at 07:45:07:
I actually tweaked each channel a few percent while using a calibration tape and a dual trace scope, so my values are just slightly different for each channel. But the starting value for R1 does work out to 75K ohms just like the calcs indicated, and 100K seems to be a good value for the input load trimmer. I'm now fairly confident that a person could use fixed resistor values of 75K for R1 and 1.5K for R2 for NAB EQ and get very good results. It might be worthwhile to keep a trimpot on the input if you plan to use the preamp with a variety of transports. I found a 100K input load to work well with the RS1500 heads and 250K to work better with the older Ampex heads. If you want to use a fixed value on the input, try starting with 250K ohms.The last set of values I plan to cook up will be for the low impedance repro head on an Ampex ATR. I have yet to get the repro head, so it will be a while before I have any data. Meantime the above values should work for most prosumer type transports like Technics RS1500, Otari MX-5050, Revox A77/B77,G36, as well as older pro stuff like Ampex 351, etc., etc.
Last night I had visions of a set of eight of these things stacked next to a Studer 827 with a 16 track repro head...
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Follow Ups
- OK, measurements done - Doc B. 09:58:16 02/07/06 (3)
- Re: OK, measurements done - Frank Waller 02:00:30 02/09/06 (2)
- OK, done - reverendclark 22:24:37 02/11/06 (1)
- Re: OK, done - ketchup 20:09:31 02/21/06 (0)
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