Tested Pair of 6BL8 ECF80 RCA NOS NIB Audio Receiver Radio Power Vacuum Tubes 

Country of origin: USA

Production era: Estimate 1960s

Model:  6BL8 ECF80

Manufacturer:   RCA

Type:   preamp

Plates: gray / black with separators

Spacers: two

Base type:  9 pin

Getter frame: halo wire 

Getter flash: top

Glass: clear

Stencils:  excellent

Condition:  excellent

Usage (estimate):  NOS (new)

Cartons: originals in very good condition

Quantity:  2

Please review the photos for more detail

Test results:

       Strong balanced test results for Gm: 4.2 / 4.5 and 5.0 / 5.5

       For Gm, the suggested minimums are:    3.6 / 2.9

Shorts: None detected

For testing, a calibrated Triplett 3444A tester was used

Compatibility: Suitable for vintage tube-based equipment,  ideal for use in audio amplifiers, power amps, and general tube equipment

The tubes will be carefully packed to ensure safe shipping

Estimated delivery time within the USA is 3 to 7 business days

Standard shipping service is US Postal 1st class

Shipping is combined when applicable

Please feel free to contact us if you require any additional information