What is the CV1936 vacuum tube?

The CV1936 is a pentode vacuum tube designed for preamp applications. Military 6J7..

What is a CV1936 substitute or equivalent?

Direct equivalents to the CV1936 include 6J7 mil. These share the same pinout and operating envelope, so they can usually be swapped without circuit changes — though batch-to-batch variations between manufacturers (NOS vs current production) may shift the sonic character noticeably.

What are the key specifications of the CV1936?

Transconductance gm ≈ 1.22 mA/V, max plate voltage 300 V, max plate dissipation 0.83 W, heater 6.3 V / 0.3 A.

Is the CV1936 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the CV1936 as Moderate availability. NOS (new-old-stock) examples from RCA, Mullard, Tung-Sol, GE, Sylvania and Telefunken trade among collectors; modern production where it exists comes mostly from JJ Electronic, Electro-Harmonix, Tung-Sol (New Sensor), Genalex, and a handful of small-batch makers.

What does the CV1936 sound like?

Military 6J7.. Sonic character also depends heavily on the circuit operating point, the surrounding tubes in the stage, and the output transformer when present — use the interactive loadline calculator on this page to explore the trade-offs.

By Jean-Michel Falligan Devergne · Reviewed May 9, 2026

←CV1936

← CV1040 CV2798 →Compare…

CV1936 Pentode Vacuum Tube

Pentode6.3V / 0.3AOctalSPICE

Sourceaudit-eu_a (CLEAN — matches canonical datasheet)Reviewed2026-05-09StatusDataModelCalcModelKoren pentodePDF

Small-signal pentode for low-noise voltage amplification

Datasheet ↗SPICE

CV1936 — Mullard — pentode vacuum tube — (1942)

1.2mA/V

6.0pF

0.0pF

7.00pF

GAIN0%

POWER2%

DRIVE50%

LINEARITY75%

SPECIFICATIONS

Heater6.3 V · 0.3 A

Max Plate Voltage300 V

Pa max0.83 W

Gain Factor—

gm1.22 mA/V

rp—

Inter-electrode capacitances

Cgk6 pF

Cgp0.005 pF

Cpk7 pF

PinoutOctal

Era1942

RarityModerate

HEATER6.3V / 0.3A

MAX PLATE300V / 0.83W

BASEoctal

EXECUTIVE SUMMARY

The CV1936 is a indirectly-heated pentode from Mullard, introduced around 1942. Commonly used in preamp applications. Military 6J7.

APPLICATIONS

Voltage amplifier

Generic pentode preamp stage

HISTORY

Introduced1942ManufacturerMullard

Pre-War

CV1936 Datasheet

Local mirror · PDF

↗

METRIX TESTER

Test this tube on a Metrix

SIMILAR PENTODES

View all →

12SJ7Preamp 307APower/Output 310APreamp 35LR6Sweep / Power 47Power/Output 4P1LPower (SET output) — DHT pentode 5639Video / wideband (power)5654RF / Preamp