Teac A-6300 - Page 30

LEVEL VARIATION
1. Thread a reel of high output tape YTT-8013, and select
HIGH (15ips) 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 20 KHz.
4. With the unit at tape SPEED LOW ( 7—1/2 ips ), the tolerances are the
same as at HIGH (15ips). Repeat step 2,3 with tape SPEED selector
in LOW position.
CHA NNEL - TO- CHA NNEL CROSS TALK REJECTION
Following is the measurement procedure 15 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 -45 dB min.
PEAK LEVEL INDICATOR ADJUSTMENT ---—-
1. Set METER switch to NORMAL, SPEED switch to HIGH. Adjust VR-307/308
so that the peak level indicator ignites by a 400 Hz/0.775V (OdB)
signal (8dB higher than normal input level) and extinguishes at a
0.5dB lower signal.
NOTE: Adjust one channel at a time while applying no signal to the
other channel.
2. After above adjustment, set SPEED switch to LOW and check that it
will ignites at an input level of 615mV (-2 dB).
3. Set METER switch to HIGH and check to see that the peak level
indicator ignites at an input level of 1.09V (+3dB) with tape speed
at HIGH, and also at an input level of 869mV (+ldB) with tape speed
at LOW.
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