Tested Trio of 6SN7GT RCA White Letter Audio Receiver Guitar Preamp Vacuum Tubes Country of origin: USA Production era: Estimate 1960s Model: 6SN7GT Manufacturer: RCA Type: Preamp Plate type: black staggered ladder Filaments: standard Base type: octal 8 pins Spacers: two Getter frame: rectangle wire Getter flash: base Glass: clear Stencils: excellent Condition: excellent, very clean Usage (estimate): some emissions Quantity: 3 Please review the photos for more detail Test results: Strong balanced test results for Gm: 2.20 / 2.05, 2.5 / 2.7 and 2.35 / 2.45 For Gm, the suggested minimum value is: 1.7 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

Two Tested 6SN7GTB RCA White Letter Audio Receiver Preamp Vacuum Tubes Country of origin: USA Production era: 1950s Model: 6SN7GTB Manufacturer: RCA Type: Preamp Plate type: Black staggered ladder Base type: Octal base (8-pin) Spacers: two Getter frame: rectangle wire Getter flash: side Glass: clear Stencils: excellent Construction: same configuration Condition: Excellent vintage condition Usage (estimate): some top emissions Quantity: 2 Please review the photos for more detail Test results: Strong balanced results for Gm: 2.35 / 2.5 and 2.15 / 2.0 For Gm, the suggested minimum value is: 1.7 Shorts: No shorts were detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for audio pre-amplification and vintage tube-based equipment ideal for use in guitar amplifiers, preamps and audio recording equipment. The tube 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 reach out if you have any questions or require additional information

Tested Trio of 6SN7GT RCA White Letter Audio Receiver Guitar Preamp Vacuum Tubes Country of origin: USA Production era: Estimate 1960s Model: 6SN7GT Manufacturer: RCA Type: Preamp Plate type: black staggered ladder Filaments: standard Base type: octal 8 pins Spacers: two Getter frame: rectangle wire Getter flash: base Glass: clear Stencils: excellent Condition: excellent, very clean Usage (estimate): some emissions Quantity: 3 Please review the photos for more detail Test results: Strong balanced test results for Gm: 2.20 / 2.05, 2.5 / 2.7 and 2.35 / 2.45 For Gm, the suggested minimum value is: 1.7 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

Tested Trio of 6SN7GT RCA White Letter Audio Receiver Guitar Preamplifier Vacuum Tubes Country of origin: USA Production era: 1950s Model: 6SN7GT Manufacturer: RCA Type: Preamp Plate type: staggered black ladder Base type: octal 8 pins Spacers: Two Getter frame: rectangle wire Getter flash: base Filaments: standard Glass: clear Stencils: very good Condition: very good Usage (estimate): some top emissions Quantity: 2 Please review the photos for more detail Test results: Strong balanced NOS results for Gm: 2.6 / 2.3, 2.3 / 2.6 and 2.85 / 3.0 For Gm, the suggested minimum value is: 1.7 Shorts: None detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for vintage tube-based equipment, ideal for use in guitar amplifiers, preamps and general audio 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

Two Tested 6SN7GTB RCA White Letter Audio Receiver Preamp Vacuum Tubes Country of origin: USA Production era: 1950s Model: 6SN7GTB Manufacturer: RCA Type: Preamp Plate type: Black staggered ladder Base type: Octal base (8-pin) Spacers: two Getter frame: rectangle wire Getter flash: side Glass: clear Stencils: excellent Construction: same configuration Condition: Excellent vintage condition Usage (estimate): some top emissions Quantity: 2 Please review the photos for more detail Test results: Strong balanced results for Gm: 2.35 / 2.5 and 2.15 / 2.0 For Gm, the suggested minimum value is: 1.7 Shorts: No shorts were detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for audio pre-amplification and vintage tube-based equipment ideal for use in guitar amplifiers, preamps and audio recording equipment. The tube 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 reach out if you have any questions or require additional information

12AT7 ECC81 RCA White Letter Audio Receiver Guitar Preamplifier Vacuum Tube Tested Quad Country of origin: USA Production era: 1950s (estimate) Model: 12AT7 ECC81 Manufacturer: RCA Type: Preamp Plate type: black wing with copper rods Base type: 9 pin Spacers: Two Getter frame: square wire Getter flash: Top Filaments: standard Glass: Clear Stencils: very good to total wear Condition: very good, same construction Usage (estimate): Minimal Quantity: 4 Please review the photos for more detail Test results: Strong balanced results for Gm: 4.7 / 4.9, 5.2 / 4.7, 4.2 / 4.2 and 4.3 / 4.8 For Gm, the suggested minimum value: 3.5 Shorts: None detected For testing, a calibrated Triplett 3444A tester was used Compatibility: Suitable for vintage tube-based equipment, ideal for use in guitar amplifiers, preamps, and general audio 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