The 6B7 is for parallel heater based mains receivers. The 2B7 differs only in that it has the original American standard AC heater of 2.5 Volts.
The pentode could be used as the final IF amplifier with the diodes as detector and AGC rectifier or it could be used with the pentode as first AF amplifier. The vari-μ nature of the pentode suggests use as an IF amplifier as does the control grid connected to the top cap.
For a low cost set for local reception a pentagrid converter the 6B7 and a high sensitivity output valve would be the probable line-up.
Made in USA on the base cap. The pentode is screened.
The standard arrangement of the diodes is shown here. A screening box connected to the cathode with two rod anodes within.
The classic envelope is 38 mm in diameter, and excluding the UX7 base pins is 99 mm tall.
References: Data-sheet & 1040. Type 6B7 was first introduced in 1932. See also1932 adverts.
