Traynor Custom Special 50 Mode D'emploi page 7

The formula to calculate Total Impedance for a parallel system is:
1/R T = 1/R 1 + 1/R 2 + 1/R 3 +1/R 4 ...
R = Rated Speaker Impedance
R T = Total Speaker Impedance
R 1 ... = Speaker Impedance
Examples (Speaker cabinets connected in parallel)
One 4-ohm cabinet = 4-ohms
Two 4-ohm cabinets = 2-ohms
Four 4-ohm cabinets = Not Recommended
One 8-ohm cabinet = 8-ohms
Two 8-ohm cabinets = 4-ohms
Four 8-ohm cabinets = 2-ohms
One 16-ohm cabinet = 16-ohms
Two 16-ohm cabinets = 8-ohms
Four 16-ohm cabinets = 4-ohms
Eight 16-ohm cabinets = 2-ohms
Replacement Tube Selection & Bias**
These YCS amplifiers come from the factory equipped with matched 5881 (YCS50H uses
matched EL34 output tubes) output tubes. The circuitry has been designed to accommodate
any type of EL34/6CA7 as well as any type of 6L6/5881 output tubes (as long as the four,
or two, output tubes are of a matching type). The amplifier has also been equipped with
bias sensing points for each of the output tubes as well as a recessed bias adjustment trim
pot that can all be accessed without removing the chassis from the box. This makes tube
replacement quick and easy.
**We recommend adjusting the zero signal bias to +75 mV +/-10mV DC at each of the test
points. Bias adjustment should be done with the amplifier configuration in the 50 Watt mode
(YCS50) or 90 Watt mode (YCS90). Please refer servicing to qualified personnel.
Footnotes for YCS50, YCS50H and YCS90
The four gain stages in the YCS series amplifiers have been configured to maximize the
available gain at each stage which provides the most flexibility possible. If all of the gain
stages are set too high (simultaneously) the amplifier or the guitar will almost certainly feed
back. There is always a limit to how much "total" gain you can achieve without feedback or
oscillation; these amplifiers are capable of enough gain to test the limits of any tube or guitar.
The amount of reverb return available is a function of the Reverb control on the channel
and the Master Volume. If "both" controls are set too high the reverb tank will feed back. This
is to allow you to play with extremely "wet" sounds at lower volume levels.
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