Can I swap a 6922 for a 6DJ8?

Yes — the 6922 and 6DJ8 are direct equivalents (same pinout and electrical envelope) and drop into the same socket without rebiasing in nearly every circuit. Manufacturer and batch differences usually matter more than the type number.

What is the difference between the 6922 and the 6DJ8?

The 6922 has μ≈33 with about 1.65 W maximum plate dissipation; the 6DJ8 has μ≈33 with about 1.8 W. The higher μ is on the 6922, the higher plate dissipation rating on the 6DJ8.

Which is better, the 6922 or the 6DJ8?

Neither is universally better — it depends on the circuit and the tone you want in a hi-fi system. Compare the side-by-side specifications and the comparison by objective on this page (gain, load, current, dissipation margin, heater, base) to choose for your build.

6922 vs 6DJ8

6922 / E88CC versus 6DJ8 / ECC88 — two triodes compared.

6922 vs 6DJ8: what differs

The 6922 and 6DJ8 are directly equivalent in most applications — same pinout, same electrical envelope, same general sonic signature. 6922 is the American/RETMA designation; 6DJ8 is the European Mullard-Philips name (or vice versa). You can swap one for the other in nearly every circuit without rebiasing, with the caveat that production-batch differences between manufacturers (Mullard vs Sylvania vs JJ vs current Russian production) often matter more than the type-number itself.

Comparison by objective

Choose what the stage has to do: the quantities below are reordered and weighted for that objective. Every value comes from the catalogue and from the datasheet typical operating point; a missing value shows “—” with its reason. No score, no ranking — only measured differences.

Voltage amplification of a small signal — common cathode with a resistive plate load.

Quantity

6922

6DJ8

Difference

Available gain (μ)Weight 3/3 · decisiveμ is the ceiling of the voltage gain of a common-cathode stage.Av ≈ μ · Ra / (Ra + rp) — with Ra = 2–3 × rp the stage reaches about 2/3 to 3/4 of μ. As a follower the gain is close to 1 whatever μ.

6922

6DJ8

Differenceidentical

Load to drive (rp)Weight 2/3 · importantPlate resistance: the lower rp, the lower the load the stage can drive at the same gain and linearity.Ra ≥ 2–3 × rp for a common-cathode stage. As a cathode follower the output impedance is about 1 / gm.

6922

2.6 kΩRa ≥ 5.3 kΩ – 8 kΩ

6DJ8

2.6 kΩRa ≥ 5.2 kΩ – 7.8 kΩ

Differenceratio ×1

Available current (Ia typical)Weight 1/3 · to checkPlate current at the datasheet typical operating point — what the stage can deliver into a capacitance or a low load.Read from the published typical point (Va, Vg). No operating point is derived from a model here.

6922

—no datasheet typical operating point in the catalogue for this tube

6DJ8

15 mAat Va 90 V, Vg −1.3 VTypical point: Philips E88CC/6DJ8 datasheet, typical characteristics

Difference—

Dissipation margin (Pa max − Pd typical)Weight 1/3 · to checkDifference between the maximum plate dissipation and the dissipation at the typical point (Pd = Va · Ia).Pd at idle < 70 % of Pa max.

6922

—no datasheet typical operating point in the catalogue for this tubePa max 1.65 W

6DJ8

0.45 WPa max 1.8 W · Pd typical 1.35 W (75 % of Pa max)Typical point: Philips E88CC/6DJ8 datasheet, typical characteristics

Difference—

Heater (V × A)Weight 1/3 · to checkHeater voltage and current, hence the power drawn from the heater winding.Same voltage required; the winding must supply the summed current of the tubes in parallel (or the same current in series).

6922

1.9 W6.3 V × 0.3 A

6DJ8

2.3 W6.3 V × 0.365 A

Differencedifference +0.41 W

Base compatibilityWeight 1/3 · to checkBase and pin-by-pin function according to the catalogue pinouts.Same base and identical pinout → same socket. Same base, different pins → rewiring. Different base → adapter or new socket.

6922

noval9-pin Noval · 9 pins

6DJ8

noval9-pin Noval · 9 pins

Differencesame base, identical pinout

Rules: Amplifier topologies guide, §07 “Design rules of thumb”

Physical compatibility

6922

6DJ8

Base

noval

Pinout

9-pin Noval

identical pin by pin (9 pins)

Sections

Bulb diameter (max)

—

— no mechanical data in the catalogue

Heating

6922

6DJ8

Heating

Indirect (IHT)

Heater voltage

6.3 V

same voltage — the same winding can feed both · 6922: no center tap · 6DJ8: no center tap

Heater current

0.3 A

0.365 A

current difference +0.065 A (+22 %)

Heater power

1.89 W

2.3 W

Bias

Datasheet typical operating point (one per tube, SEQ-02) and the cathode resistor it implies.

6922

6DJ8

Va typical

—no datasheet typical operating point in the catalogue for this tube

90 V

Vg typical

—

−1.3 V

Ia typical

—

15 mA

Indicative Rk = |Vg| / Ia

—

87 Ω

Pd typical = Va · Ia

—

1.35 W

6DJ8 — Typical point: Philips E88CC/6DJ8 datasheet, typical characteristics

Performance for the objective

Catalogue values, weighted as in the objective table (Gain input stage). rp is a design parameter, not a merit.

6922

6DJ8

Difference

identical

12.5 mA/V

identical

2.6 kΩ

ratio ×1

Pa max

1.65 W

1.8 W

difference +0.15 W

Va max

250 V

130 V

difference −120 V

Substitution possible under conditions

6922 and 6DJ8 list each other as equivalents in the catalogue.

heater current differs (0.3 A vs 0.365 A) — check the winding rating

Substitutes for 6922

Side-by-side specifications

Side-by-side specifications of 6922 and 6DJ8
Spec	6922	6DJ8
Full name	6922 / E88CC	6DJ8 / ECC88
Type	Triode	Triode
Primary use	Preamp	Preamp
Era	1958	1958
Heating	indirect	indirect
Heater voltage	6.3 V	6.3 V
Heater current	0.3 A	0.365 A
Amplification factor (μ)	33	33
Transconductance (gm)	12.5 mA/V	12.5 mA/V
Plate resistance (rp)	2.6 kΩ	2.6 kΩ
Max plate voltage	250 V	130 V
Max plate dissipation	1.65 W	1.8 W
Base	noval	noval
Manufacturer	Amperex·Philips·Siemens	Amperex·Philips
Rarity	Sought-after	Common

Sonic character

Listening folklore — not electrical data

6922

Premium 6DJ8. Sought-after for hi-fi preamps.

6DJ8

Dynamic, open.

Need an interactive deep dive?

The Amperatubes comparator visualises loadlines for both tubes side-by-side, simulates the SPICE response, and lets you adjust the operating point in real time.

Open 6922 vs 6DJ8 in the interactive comparator →