What is the CK5654 vacuum tube?

The CK5654 is a pentode vacuum tube designed for rf / preamp applications. Selected 5654..

What is a CK5654 substitute or equivalent?

Direct equivalents to the CK5654 include 5654. 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 CK5654?

Amplification factor μ ≈ 32, transconductance gm ≈ 5 mA/V, plate resistance rp ≈ 340.0 kΩ, max plate voltage 200 V, max plate dissipation 1.65 W, heater 6.3 V / 0.175 A.

Is the CK5654 still in production?

Production status varies by year and manufacturer. The current Amperatubes catalog classifies the CK5654 as Common 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 CK5654 sound like?

Selected 5654.. 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 29, 2026

←CK5654

← C3m CK6336A →Compare → 5654

CK5654 Pentode Vacuum Tube

Pentode6.3V / 0.175A7-pin MiniatureSPICE

Sourceaudit-us_b (CLEAN — matches canonical datasheet)Reviewed2026-05-29StatusDataModelCalcModelKoren pentodePDF

Small-signal pentode for low-noise voltage amplification

Datasheet ↗SPICE

CK5654 — Raytheon — pentode vacuum tube — (1953)

340.0kΩ

5.0mA/V

4.0pF

0.0pF

2.85pF

GAIN32%

POWER4%

DRIVE0%

LINEARITY84%

SPECIFICATIONS

Heater6.3 V · 0.175 A

Max Plate Voltage200 V

Pa max1.65 W

Gain Factor32

gm5 mA/V

rp340.0 kΩ

Inter-electrode capacitances

Cgk4 pF

Cgp0.02 pF

Cpk2.85 pF

Pinout7-pin Miniature

Era1953

RarityCommon

HEATER6.3V / 0.175A

MAX PLATE200V / 1.65W

BASEminiature-7

Source datasheets

12 manufacturer datasheets cross-checked for CK5654

12 verified

Triode-connectedSiemens1960 (RöK 3265 / 1.4.60)

Specs when the screen grid (g2) is tied to the anode — the tube acts as a triode.

120 V

10 mA

6.7 mA/V

4.8

4.8 Ω

According to Siemens (Siemens Röhren / Siemens & Halske AG, Wernerwerk) (1960 (RöK 3265 / 1.4.60)): « TRIODE-CONNECTED »

EXECUTIVE SUMMARY

The CK5654 is a indirectly-heated pentode from Raytheon, introduced around 1953. It provides a gain factor (μ) of 32 with 340.0kΩ plate resistance. Commonly used in rf / preamp applications. Selected 5654.

APPLICATIONS

Voltage amplifier

Generic pentode rf / preamp stage

VS 5654

Rp +0%Pd 0%Full comparison →

HISTORY

Introduced1953ManufacturerRaytheon

Golden Age