Teac A-6300 - Page 42

LEVEL VARIATION
1. Thread a reel of high output tape YTT-8013, and select
HIGH (7-1/2 ips) SPEED position.
2. Record a variety of frequencies, such as 400 Hz, 2 kHz, 5 kHz,
8 kHz, 10 kHz, etc., at the specified input setting with the
RECORD BIAS switch #1 position. Record approximately 10
seconds of each frequency.
3. During playback the output level should not vary more than 0.5dB at
400 Hz, 1 dB at 5 KHz to 19 KHz.
4. With the unit at tape SPEED LOW (3-3/4 ips), the tolerances are the
same as at HIGH (7-1/2 ips). Repeat step 2,3 with tape SPEED selector
in LOW position.
CHANNEL-TO-CHANNEL CROSS TALK REJECTION
Following is the measurement procedure at 7-1/2 ips using the TEAC reference
tape. Type YTT-8013:
1. Apply a 1 KHz signal at the operating level of -8dB, to the left channel
LINE IN jack.
2. Install a short-circuiting plug to the right channel LINE IN jack.
3. Make a 30 second recording on both channels, then rewind to beginning
of this recording.
4. Connect a TEAC Test Set (M-826A), or equivalent, to the right channel
OUTPUT jack through a 1 KHz narrow Band Pass Filter (TEAC M-206).
5. Put recorder in PLAY mode and monitor the "no signal" right channel on
the Test Set meter. The reading should be -50 dB or more.
TRACK-TO-TRACK CROSS TALK REJECTION -
1. Thread the YTT-8013 tape on unit.
2. Apply a 125 KHz signal at -8dB to the right and left channel
LINE IN jack.
3. Make a 30 second recording of the 125 Hz signal. Measure OUTPUT
of both channels.
4. Stop the unit and remove 125 Hz signal input.
5. Connect TEAC Test Set (M-826A) to the right and left channel
OUTPUT jack.
6. Reverse playback the recorded signal portion of tape and monitor
the level on the Test Set meter.
7. The reading should be -40 dB or more compared to readings taken
during forward record mode in step 3.
NOTE
The Band Pass Filter used in previous measurement is not required
for this measurement.
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