DYNACO PAS-4 Owner's Manual page 6

Balance Control
This adjusts the proportion of left and right channel signals going to the preamp's line level amplification
stage (and therefore to the preamp's main outputs). Only the left channel signal will be heard with the
Balance Control turned fully counter-clockwise, and only the right channel signal with full clockwise
rotation. The function of the Balance Control is to compensate for unbalanced left and right channel signal
levels (from phonograph records, for instance) or to compensate for non-symmetrical room acoustics
(from furniture, wall reflections, etc.).
Tape Deck Selection - Recording
The TAPE DUBBING switch determines which signals are sent to the tape decks for recording purposes.
If the TAPE DUBBING switch is set to SOURCE, both tape decks receive the same signal - the one
indicated by the position of the INPUT switch.
A copy of a tape can be made when the TAPE DUBBING switch is set to either '2 to 1' or '1 to 2'. (When
this is done, the signal source selected by the INPUT switch is disconnected from both tape decks.)
When the TAPE DUBBING switch is set to '2 to 1', the output of tape deck #2 goes to the input of tape
deck #1 to be recorded. When the TAPE DUBBING switch is set to "1 to 2", the output of tape deck #1
goes to the input of tape deck #2 to be recorded.
The TAPE MONITOR switch can be used to listen to the "source" tape deck (the original recording) or the
"target" tape deck (the dubbed recording) while tape dubbing is being done. However, if the TAPE
MONITOR switch is set to SOURCE, one can listen to any music signal selected with the INPUT switch
while tape dubbing is in progress.
Note: Some older tape decks which do not have high impedance input circuitry can present non-linear
loads to a preamp's Tape Outputs even when the tape decks are turned off. This can be a
problem because the Tape Outputs are usually connected to which ever signal source has been
selected by the INPUT switch. This "always present" non-linear load can degrade performance on
most preamps.
With the PAS-4 there is a solution to the use of lower input impedance tape decks. Simply keep the TAPE
DUBBING switch positioned to '1 to 2' or '2 to 1' when the deck is not in use. This disconnects the signal
selected by the INPUT switch from both tape decks, as mentioned previously.
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