R.V.R. Electronica VJ3000, Maintenance Manual

Page: 21 / 50

R.V.R. ELETTRONICA S.r.l. (BO) Pag. 21
VJ3000 - Technical and Maintenance Manual
frequency.
In the central section of the chamber, around the tube socket, is
situated a collar with fingers to ground the control grid.
Two disks are also situated in this section of the chamber, on the left-
hand side panel, which act as variable capacitors, C6 is connected to
the load-tuning motor, M3 (LOAD) and C34 which is used to aid low frequency
tuning.
The socket is situated in the bottom section, into which the tube is
inserted.
In this section capacitors C31 and C32 are situated on the socket and
connected in parallel to the filament to maintain a constant folament
voltage. On the outside of the chamber, on the right-hand side, two Kapton
capacitors, C18 and C19 prevent any R.F. signals from returning from the
filament back to the transformer.