IN TRADE 50 Hz - 20 kHz Frequency Response 70us Equalization Test Tape Set

Suitable for Playback Frequency Response adjustment of any Cassette Tape Deck using an AC millivoltmeter

315 Hz Reference, 50 Hz, 100 Hz, 400 Hz, 1 kHz recorded on new TDK 17u tape 4 kHz, 10 kHz, 15 kHz, 20 kHz recorded on new TDK, TEAC or AMPEX Chrome tape

Each Tape is a Full-track Master tape (not a copy). It is recorded OFF SHELL using an OTARI 0.15" (3.81mm) Reel-to-Reel MX-5050BIII-F-P4 Production full-track tape recorder and professional test equipment. The Capstan motor controlled by digital Quartz- Locked PLL, and can work at standard speeds with 0.01% accuracy, and at any speed from 1-7/8 to 30 ips using an external clock generator (Yes I can record a cassette at 30 IPS if you need it)

Reproduction (Playback) Head is a 4-track 4-channel head to measure Level unevenness @ 400 Hz ACROSS the tape before recording. Tapes with difference in Level more than 0.2 dB discarded

Reproduction Equalization calibrated using Constant Magnetic Field Transducer

Standard: IEC (Prague) 1981 Type II CrO

Time Constant: 3180us + 70us

Recorded 20dB below 200nWb/m @ 400Hz Level

Level fluctuation less than +/-0.2 dB measured. Typically +/-0.1 dB

Frequency fluctuation +/-0.01% measured

Following Test Cassettes included: 315 Hz Reference, 50 Hz, 100 Hz, 400 Hz, 1 kHz, 4 kHz, 10 kHz, 15 kHz, 20 kHz

One tone recorded on each tape at the level corresponding to the Equalization curve

Duration of each Tape 10 min recorded at the BEGINNING of the Tape from 00 min 10 sec to 10min 10 sec

You may order custom set with different Speed (15/16", 1-7/8" or 3-3/4"), different Frequencies and Equalization. Just give me your Equalization curve Time Constants (3180us + 120us for Type I Ferro, 1590us+120us for Old Nakamichil e.t.c).

P.S. Good luck and please only bid if you are serious and going to pay in full within 3 working days

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