VINTAGE TECHNOLOGY ARCHIVE / TUBES / 6GC5

6GC5

6GC5 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $9.98 per tube.

Description

The 6GC5 is a power pentode with a unipotential (indirectly heated) cathode. It uses a large-button Noval 9-pin base (JEDEC No. E9-68). The heater is rated for 6.3 ± 0.6 volts AC or DC.

Pinout

The pinout is: pin 1 = Grid No.2, pin 2 = no internal connection, pin 3 = Grid No.1, pin 4 = heater, pin 5 = heater, pin 6 = Grid No.1, pin 7 = cathode and Grid No.3, pin 8 = Grid No.2, pin 9 = plate.

Ratings

Maximum plate voltage is 140 volts. Maximum screen-grid (Grid No.2) voltage is 140 volts. Maximum Grid No.2 input power is 1.4 watts. Maximum plate dissipation is 12 watts.

Characteristics

Transconductance is 8000 micromhos. Total harmonic distortion is 10 percent. Plate resistance is approximately 13000 ohms under fixed-bias conditions and approximately 28000 ohms under cathode-bias conditions. Maximum signal power output is 2.1 watts under fixed-bias conditions and 3.8 watts under cathode-bias conditions. For fixed-bias operation, the maximum Grid No.1 circuit resistance is 0.1 megohm; for cathode-bias operation, it is 0.5 megohm.

What 6GC5 Sells For
MeasurePer tube
Median$9.98
Typical range (25th–75th) $6.99 – $13.89
Most sales (10th–90th) $6.07 – $15.00
Extremes incl. outliers $3.88 – $18.99
Completed sales15
By Brand
BrandMedianRangeSales
RCA$9.98 $7.76 – $15.007
Sylvania$10.00 $8.22 – $18.993
By Condition
ConditionMedianSales
NOS$9.9012

Per-tube prices from completed sales, 2023-03-28 to 2026-10-04. Matched pairs and quads are divided out. See the price index for how these move over time.

Datasheets

Original manufacturer datasheets for 6GC5, hosted by Frank Philipse's Electron Tube Data sheets.

ManufacturerDesignationDatasheet
RCA (HB3) 6GC5 PDF (244 KB)
Sylvania 6GC5 PDF (76 KB)
Tung-Sol 6GC5 PDF (64 KB)
In the Archive

Documents held here and used to write this page.