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dence between record and playback head gaps results in a loss of high
frequencies during playback - and the loss is even greater the wider the
audio track is and the slower the tape speed - correction of the azimuth
of the playback head will usually be required only for half-track recor-
dings and at tape speeds of 3% or 7
lead to improved high frequency reproduction, then the record head of
the other recorder may have been heavily clogged or worn. If sound
system loudspeakers are used to monitor the adjusting process, the
treble control on the power amplifier of the system should be opened
up in full.
For record/playback of recordings made with the SG 631 LOGIC, the
factory-set length of the playback head gap should be restored.
6.8 Putting On the Transparent Dust Cover Z 630
At its two upper corners UHER Transparent Dust Cover Z 630 has sup-
porting plates with ridges that must be pressed into the top ventilating
slits of the SG 631 LOGIC when the machine is in upright position.
To bring the supporting plates into position over the ventilating slits, they
should be lightly pressed outwards. Once fully pressed down into the
slits, the plates will lock firmly in the groove between the upper and
lower sections of the housing. On opening or closing the lid, it will remain
in any intermediate position in which it is placed.
6.9 Operation of the SG 631 LOGIC with UHER Timer A 403
The timer will switch on the power supply for the SG 631 LOGIC as
described in the operating instructions for the timer. For recording,
thread the tape as described in sec. 1.6 above and press the POWER
switch © into its lock-down position. The switch of the UHER-Adapter
K 642 (which must be connected to the ACCESSORY socket of the
tape recorder) must be closed.
If a timer is to regulate a recording, a record level test should be made
before the power supply of the input source is switched on via the timer.
Once the timer has switched on the power supply of the input source
and that of the SG 631 LOGIC, the start switch of the timer will switch
the recorder to the functions RECORD and START, and the recording
will commence.
kindly consult your nearest UHER service agent who will then make the
necessary changes in your adapter.
Startschalter
6.10 Tapes and Reels
The quality of the tape used is just as essential to high quality in re-
cording as the quality of the recording equipment. More and more brands
of tapes are being found among the wide assortment on the market
that have greatly differing mechanical and electro-acoustical properties.
That is why UHER has now added to its supply programme blank tape
with characteristics that match, and in some points surpass, the pro-
perties of German DIN test tap'e C 264 Z: UHER "professional" tape Z 830.
The base material is stretched polyester plastic with a black anti-static
coating that was especially developed for fast-winding machines. The
Fig. 5
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