Page 20 - RD_2019-03.ppp

The P5 series comprises:
P5 S for silent film projection.
P5 L 6 for projection of films with optical sound through a 6 W tube amplifier with an 8 W case
loudspeaker.
P5 T 6 for the projection of films with optical and magnetic sound through a 6 W valve amplifier with
an 8 W case loudspeaker.
P5 L 15 for projection of films with optical sound through a 15 W valve amplifier with a 20 W case
loudspeaker.
P5 T 15 for projection of films with optical and magnetic
sound through a 15 W valve amplifier with a 20 W case
loudspeaker.
P5 M 15 for projection of films with optical and magnetic
sound as well as for recording magnetic sound. The
vakve amplifier is 15 W and the case loudspeaker 20 W.
Each model could be upgraded to the next.
In 1962 two more models added to the P5 series:
P5 L 7 for the projection of films with optical sound
through an internal 6 W transistor amplifier with a 10 W
case loudspeaker.
P5 T 7 for the projection of films with optical and mag-
netic sound through an internal 6 W transistor amplifier
with a 10 W case loudspeaker.

A simple change from using a valve amplifier to an
internal transistor amplifier meant the total weight was
reduced from more than 20 kg to 15 kg.
The choice of lamps to be used in these projectors name-
ly: 75 V 375 W, 100 V 500 W, 100 V 750 W and 100 V
1000 W was also significant. The lamps were all supplied
with a suitable resistor to drop the voltage, but the heat it
produced was a heavy burden on the cooling system. So
it was recommended that the lamp, especially the
1000 W, be supplied through a transformer.
Bauer and Siemens used a condenser calculated for
the 100 V 500 W lamp in their 16 mm projectors.
There were no condensers designed especially for
the 750 W and 1000 W lamps so their light output
was restricted.
Towards the end of the P5 production the 100 V
500 W and the 100 V 750 W lamps were replaced
by low voltage lamps: 24 V 250 W and 24 V 400 W,
which gave a better light output but there were no
halogen lamps. The lamp socket was still the famil-
iar P 28.
The choice of projection lenses was wide and in-
cluded:
Schneider Xenon 1: f/1.4, 25
mm.
Isco Kiptaron 1:f/1.3, 35 mm.
Pic. 8. Lamp with its resistor.
20 REEL DEALS March 2019