6L6GC RCA Black Plates – Halo Side Getter – Matched Pair – USA Tubes – Tested Strong Amplitrex

6L6GC RCA Black Plates Side Halo Getter Matched Pair Tubes MADE IN USA

Description:

The 6L6GC RCA , in this precious version with black plates , lateral halo getter and symmetrical internal structure, represent one of the reference standards in the history of American power tubes. The robust construction, combined with the historically recognized tonal quality of the RCA brand, gives life to a musical, authoritative and transparent tube, capable of returning a faithful, rich and dynamically controlled reproduction.

This matched pair ensures uniformity between channels and consistent performance in high-fidelity contexts, whether in push-pull stereo hi-fi or in high-end, vintage or boutique guitar amplifiers .

Bass : Deep and firm. The low end is well anchored , with controlled punch and excellent articulation . The bass is not intrusive, but supports the soundstage with authority and precision , making this tube ideal for systems with extended frequency response.

Mids : full-bodied and centered. The timbral heart of the RCAs lies in the full, natural and dynamically rich mids . Voices are credible and direct , acoustic instruments emerge with presence and well-defined harmonics , without ever artificially coloring the signal.

Highs : refined and present. The high range is extended but silky , with a detail finely integrated into the musical context. No tendency towards excessive brightness: only transparency and natural definition , even during prolonged listening.

Dynamics : solid and progressive. The response to transients is fast but controlled , with excellent linearity even at high volume . The power output is fluid, with a dynamic capacity that supports micro and macro variations without ever collapsing.

Soundstage : wide and stable. The stereo image is coherent, deep and well-layered , with excellent positioning of the instruments and a credible and enveloping spatial reconstruction.

🎧 Use in Push-Pull Stereo Hi-Fi Amplifiers
The 6L6GC RCA Black Plates are particularly suited for 6L6GC-compatible Class AB amplifiers (e.g. Harman Kardon Citation V , Heathkit W5M , Pilot SA-260 , or high-end homebrew designs). They deliver a neutral yet musical sound, with dynamic, emotional output that enhances any musical genre, from classical to acoustic rock.

🎸 Use in Guitar and Bass Amplifiers
Among the most appreciated tubes in Fender history , the RCA 6L6GC are synonymous with creamy saturation , clean and harmonic-rich headroom , progressive musical compression . Ideal for amps such as Twin Reverb , Bassman , Bandmaster , where the sound must be alive, dynamic and ready to react to the touch .

🎯 Note for audiophiles and technicians
An iconic valve, representing the American tonal standard par excellence. The RCA Black Plates , in matched pair configuration, guarantee electrical coherence, tonal balance and a unique voice , appreciated both in high fidelity systems and in professional musical instruments.

Test Results:

Tested on AMPLITREX AT-1000 Tube tester:
Vf = 6.3V; Va = 350; Vg2 = 250; Vg1 = -18V
Average 100% Gm = 5200 ; Ia = 54 mA
TEST RESULT: VERY STRONG

Valve 1: Gm = 4740 ; Ia = 55 mA
Valve 2: Gm = 4900 ; Ia = 59 mA

• Microphonics: Standard. Tested and compliant for use in hi-fi and guitar amplifiers.
• Output Quality: Excellent – Very strong and stable output, no fluctuations.
• Short circuits and GAS: Absent.

Conditions:

• Condition: Vintage Tubes - Tested and in perfect working order. Supplied in our custom box for optimum protection.
  
• Functionality: Fully functional.
  
• Aesthetic Condition: Sufficient – Writing completely disappeared, with obvious signs of wear on the base or feet. See photos for details.
  
• Manufacturing Code: None. Manufacturing year detected by internal structure - Made in USA in the 1960s.

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