The CV2380 from 1955 is a low power X-Band pulsed magnetron. The operation is on a spatial harmonic rather than a fundamental. The valve must be operated in a waveguide (WG16) cavity.
The attached PDF gives details of the development of the spatial harmonic magnetron. The design stems from wanting to operate from lower anode voltages.
The serial number of this 9.4 GHz valve is 212. The anode looks to have the single central hole but in fact behind the mica plate the copper continues almost to the centre where both sides are angled to a reduced cross section. The cathode tube is mounted very close to these two pole pieces.
Side view of the copper anode block. The heater is bonded to the cathode at the left side. The other side of the insulated heater is seen on the right.
The single strand heater.
Microscope image. The cathode support looks to be glass rather than mica. The shaping of the pole pieces can be seen.
The heater is probably tungsten as the connection is by a folded support.
The start of the pole shaping can be seen in the centre.
The cathode tube can be seen to be oxide coated as it enters the space between the anode poles.
Thanks to Dave Mallison for donating this exhibit.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 46 mm tall.
Reference: Data-sheet. Type CV2380 was first introduced in 1955. See also1955 adverts.
