Voltage - Triode (with diode, heptode or hexode) ·Hexode-Triode
Triode-hexode frequency changer for superheterodyne receivers. The triode supplies local oscillation while the hexode performs mixing, with heater characteristics intended for series-heater equipment.
The Mullard TH13C is an indirectly heated triode-hexode frequency changer with a common cathode; its supplied sheet refers to TH4 for the non-heater electrical characteristics.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
2 physical sections, each with unique specifications.
Section 1
No fixed ratings are recorded for this section.
Mullard TH13C oscillator triode, sharing a common cathode with a hexode mixer, in a 13 V / 0.31 A indirectly heated frequency changer for AC/DC heater supplies. Manufacturer gives 13-second heating time and 75 V maximum heater-to-cathode potential. For non-heater electrical specifications Mullard refers specifically to its frequency changer TH4, not the unrelated Philips TH4 thermocouple.
Section 2
No fixed ratings are recorded for this section.
Mullard TH13C frequency-converter hexode with common cathode shared by an oscillator triode. Nominal heater 13 V / 0.31 A and heater-to-cathode maximum 75 V. Mullard states non-heater properties are those of its frequency changer TH4; do not substitute data from the separate Philips TH4 thermocouple.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Heater Voltage
13 V
Heater Current
310 mA
Heating Time
13 s
Maximum Heater-Cathode Voltage
75 V
Electrical Characteristics Reference
TH4 text
SuppliedSheetStatesIdenticalExceptHeaterRating