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In Reply to: questions regarding bias and eq posted by Vinnie on January 1, 2007 at 14:30:12:
Bias is only applied in the recording process. Playback is never adjusted as to bias. As to EQ most pre-recorded reel to reel tapes in the USA are NAB. Most European tapes are CCIR. Nagra has a unique equalization scheme but hardly no pre-recorded tapes were made with it. It was used primarily with film sound on location with Nagra recorders. As to tape formulation, every company had their own "deal". Ampex used AMPEX tape. Capital used AUDIOTAPE. Many companies were into making audio tape in the 50-80s; Irish became Ampex, Kodak made tape for a short time and then the European companies Agfa and Basf. Basf sold a lot of cassette tape. Most studio mastering was done on Scotch 111 until about 1967 then back coated tape came in with "low-noise" 202, 206. Ampex with 406 then 456. Bias was set to 0db and not overbiased until the "low-noise" tapes with finer oxide and higher coercivity demanded a slight overbias by about .5 to 1 db. Ray
"I take you as you are
And make of you what I will,
Skunk-bear, carcajou, bloodthirsty
Non-survivor.
Lord, let me die but not die out." THE LAST WOLVERINE by James Dickey
Follow Ups:
For cassette tapes, if the recordings are based on 70uS equalization you should set the equalization on your deck to 70uS instead of 120uS during playback. This has been clearly indicated on the J-inserts that come with the cassette tapes that are recorded using 70uS.For example, in a PRO-ARTE pre-recorded cassette tape, on the J-Insert it states:
" Duplicated on Chromium Dioxide Tape, Requires 70uS Eq. "
For Reel to Reel I do not know though.
So what eq are you suggesting I use for pre-recorded cassettes when there is nothing on the tape?
120uS Eq.
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