5Y3GT ( 5Z2P ) RCA NOS Black Plates Square Getter Tube Rectifier Made in USA '58
Description:
The RCA 5Y3GT , in this 1958 version with black plates and square getter , represents one of the most reliable and musically transparent interpretations of the classic American direct-heated rectifier. The GT (glass tubular) format offers a compact yet robust structure, ideal for low-power audio applications, such as single-ended amplifiers , tube preamplifiers or restored hi-fi radios .
RCA, with its unmistakable tonal signature, provides in this tube a perfect balance between operating silence, dynamic coherence and musical warmth , making it particularly suitable for contexts in which the naturalness of the signal takes priority over pure power.
Bass : soft and harmonious. The low range is rounded and controlled , without exuberance or rigidity. Not particularly deep, but musical and well integrated , it contributes to a warm and stable sound base.
Mids : Natural and intimate. The mid frequencies are balanced and clean , with a coherent and unemphasized rendering. Voices and acoustic instruments are credible and centered , with a realism without excess.
Highs : Silky and never fatiguing. The high range is sweet, slightly attenuated , with a controlled brightness that favors relaxed listening. The detail is there, but it is never pushed to the foreground.
Dynamics : progressive and musical. The response to transients is smooth but coherent , without obvious stuttering or compression. Ideal for systems where expressive fluidity is more valuable than extreme reactivity.
Soundstage : compact but credible. The stereo image is cohesive, with sufficient depth and stable positioning , without artifice. The scene develops naturally and proportionately , perfect for controlled home environments.
🎧 Use in Hi-Fi Amplifiers and Low Power Driver Stages
Perfect for tube DACs , vintage preamps , 2–8 watt single-ended amplifiers , this RCA 5Y3GT offers stable voltage, smooth start-up and a classic, relaxed sound signature. A great choice for systems that focus on refinement, silence and extended listening , even with high-efficiency speakers.
🎸 Use in Low-Wattage Guitar Amps
Widely used in low-powered Fender Tweed amps (such as the Champ, Princeton, pre-CBS Deluxe), this rectifier contributes a warm, compressed, organic sound, with natural sag and a musical edge that’s ideal for blues, jazz, and vintage rock . The sound “collapses” nicely under stress, lending character and musicality.
🎯 Note for audiophiles and technicians
A classic, transparent and unobtrusive voice tube that combines the historic RCA reliability with a coherent and artifice-free sound output. In the NOS version from 1958 , with square getter and black plates , it is an excellent choice for those looking for a silent, long-lasting and musically neutral rectifier for low-power audio systems.
Test Results:
Valve tested on Funke W19 Tube Tester:
- Test Conditions: Va = 100V ; Vf = 5V
- Average 100%: Ia = 77.5 mA
- Test Result: VERY STRONG
Valve :
- Section 1: Ia = 82 mA
- Section 2: Ia = 80 mA
Additional Tests Performed:
- 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: NOS - New Old Stock - Tested and working - Supplied in our custom box for optimal protection.
- Functionality: Fully functional.
- Aesthetic condition: Excellent – Perfectly preserved writing, minimal signs of wear. See photos.
- Manufacturing Code: KV - RCA Production April 1958
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