1955 GE JG-12AX7 NOS – Long Gray Plates, Copper Posts, Horseshoe Getter – Quiet

Listing details

A clean early 1955 General Electric JG-12AX7 / ECC83 with long gray plates, copper grid posts and the distinctive horseshoe / U-shaped getter.

You will receive the exact tube shown in the photographs.

This is the early GE construction many vintage-tube buyers specifically look for—not a later short-plate 12AX7.

1955 GE manufacture

JG-12AX7 marking

Long gray plates

Copper grid posts

Horseshoe / U-shaped getter

Date code: 509

Manufacturer code: 188-5

NOS old-stock tube

Supplied in a clean new white protective tube box; this is not represented as original GE packaging

Individually Tested on a Triplett 3444

Actual measured results for this exact tube:

Triode 1

Gm: 1,500 µmhos

Plate current: 1.4 mA

Triode 2

Gm: 1,725 µmhos

Plate current: 1.7 mA

Triplett reference used:

1,500 µmhos average-new / 1,000 µmhos reject

No shorts detected

No significant leakage detected

No noise detected during testing

One section measures at the recorded average-new Gm reference and the other measures above it.

An Early GE With the Details That Matter

The appeal here is straightforward: genuine early GE construction, surviving JG markings, desirable long plates and copper posts, plus documented electrical testing on the exact tube you are buying.

The JG marking is the abbreviated Joint Army-Navy identification historically used for General Electric tubes. It is part of this tube's history and identification—not a modern marketing designation.

For a vintage amplifier, preamplifier, phono stage, guitar amplifier or other equipment designed for the 12AX7 / ECC83, this gives you the opportunity to use an authentic 1950s American tube whose actual condition and electrical performance have already been checked.

There is no mystery tube and no stock photograph here.

This is the exact 1955 GE tube pictured, individually tested and ready for its next system.

Only one is available.

Carefully packed for shipment in a new protective white tube box.

VTubeAudio — vintage tubes individually identified, tested and documented so you can buy with confidence.

SKU c3-4 87748441