The ZANUSSI CHASSIS BS157-3B is the first Hybrid chassis having a completely semiconductors based IF Stages and others too.
This chassis was even used to have a keyboard instead of a mechanic assy's tuner system used in earlyer models with CHASSIS BS110.
It's the successor of the BS110 even here already shown
Tubes used:
PL504
PY88
PCF802
PCL805
ECH803
PCL86
NOTE:
- The tuner is directly UNDER the chassis.
- The EHT Output is realized with a selenium rectifier.
The EHT selenium rectifier which is a Specially designed selenium rectifiers were once widely used as EHT rectifiers in television sets and photocopiers. A layer of selenium was applied to a sheet of soft iron foil, and thousands of tiny discs (typically 2mm diameter) were punched out of this and assembled as "stacks" inside ceramic tubes. Rectifiers capable of supplying tens of thousands of volts could be made this way. Their internal resistance was extremely high, but most EHT applications only required a few hundred microamps at most, so this was not normally an issue. With the development of inexpensive high voltage silicon rectifiers, this technology has fallen into disuse.
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