{"product_id":"45-st-rca-cunningham-matched-pair-black-plates-foil-dimpled-getter-radiotron-tubes-made-in-usa-1930s","title":"45 ST RCA Cunningham Matched Pair Black Plates Foil Dimpled Getter Radiotron Tubes Made in USA 1930's","description":"\u003cp\u003e\u0026nbsp;\u003cstrong data-start=\"96\" data-end=\"210\"\u003e45 ST RCA Cunningham Matched Pair – Black Plates – Foil Dimpled Getter – Radiotron Tubes – Made in USA – 1930s\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"212\" data-end=\"619\"\u003e\u003cstrong data-start=\"212\" data-end=\"228\"\u003eDescription:\u003c\/strong\u003e\u003cbr data-start=\"228\" data-end=\"231\"\u003eThis matched pair of RCA Cunningham 45 ST tubes from the 1930s represents one of the most iconic and refined voices in early-era American tube production. Featuring \u003cstrong data-start=\"396\" data-end=\"412\"\u003eblack plates\u003c\/strong\u003e, \u003cstrong data-start=\"414\" data-end=\"437\"\u003efoil dimpled getter\u003c\/strong\u003e, and a more modern \u003cstrong data-start=\"457\" data-end=\"484\"\u003eST-style glass envelope\u003c\/strong\u003e (as opposed to globe types), these tubes retain the full musicality that made the 45 a benchmark in low-power single-ended amplifiers.\u003c\/p\u003e\n\u003cp data-start=\"621\" data-end=\"798\"\u003eThanks to the precise matching, these two tubes offer \u003cstrong data-start=\"675\" data-end=\"710\"\u003esymmetrical electrical behavior\u003c\/strong\u003e, ideal for dual mono or stereo single-ended applications with high-efficiency speakers.\u003c\/p\u003e\n\u003cp data-start=\"805\" data-end=\"837\"\u003e\u003cstrong data-start=\"805\" data-end=\"837\"\u003eTonality and Sound Signature\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"839\" data-end=\"1064\"\u003e\u003cstrong data-start=\"839\" data-end=\"848\"\u003eBass:\u003c\/strong\u003e\u003cbr data-start=\"848\" data-end=\"851\"\u003eLight but articulate. The low-end is precise, dry, and natural, with excellent timing and rhythmic articulation. Perfect for those who prefer an agile response that does not mask the details in the lower midrange.\u003c\/p\u003e\n\u003cp data-start=\"1066\" data-end=\"1364\"\u003e\u003cstrong data-start=\"1066\" data-end=\"1079\"\u003eMidrange:\u003c\/strong\u003e\u003cbr data-start=\"1079\" data-end=\"1082\"\u003eExceptionally transparent. This region is the real strength of this pair: lifelike vocals, three-dimensional acoustic instruments, and a fluidity that makes every listening session natural and engaging. The sound is present but never intrusive, with an extremely fine tonal texture.\u003c\/p\u003e\n\u003cp data-start=\"1366\" data-end=\"1536\"\u003e\u003cstrong data-start=\"1366\" data-end=\"1376\"\u003eHighs:\u003c\/strong\u003e\u003cbr data-start=\"1376\" data-end=\"1379\"\u003eSweet and airy. The treble is extended yet smooth, with a fine grain and no trace of harshness. Excellent rendition of ambient \"air\" and microdynamic detail.\u003c\/p\u003e\n\u003cp data-start=\"1538\" data-end=\"1754\"\u003e\u003cstrong data-start=\"1538\" data-end=\"1551\"\u003eDynamics:\u003c\/strong\u003e\u003cbr data-start=\"1551\" data-end=\"1554\"\u003eNatural and progressive. The response to transients is fast and coherent, never compressed or artificial. These 45s reproduce every change in intensity with musicality and clarity, even at low volume.\u003c\/p\u003e\n\u003cp data-start=\"1756\" data-end=\"2001\"\u003e\u003cstrong data-start=\"1756\" data-end=\"1771\"\u003eSoundstage:\u003c\/strong\u003e\u003cbr data-start=\"1771\" data-end=\"1774\"\u003eIntimate but precise. The stereo image is centered, well-organized, and realistically layered, with excellent depth and source localization. The stage isn’t as wide as higher-power tubes, but it is cohesive and very believable.\u003c\/p\u003e\n\u003cp data-start=\"2008\" data-end=\"2344\"\u003e🎧 \u003cstrong data-start=\"2011\" data-end=\"2048\"\u003eUse in Single-Ended Hi-Fi Systems\u003c\/strong\u003e\u003cbr data-start=\"2048\" data-end=\"2051\"\u003ePerfect for \u003cstrong data-start=\"2063\" data-end=\"2092\"\u003eSET (Single-Ended Triode)\u003c\/strong\u003e amplifiers offering 1.5 – 2 watts per channel, paired with high-efficiency loudspeakers. This matched pair is ideal for those seeking an \u003cstrong data-start=\"2230\" data-end=\"2261\"\u003eorganic, fluid, and musical\u003c\/strong\u003e presentation, with special focus on vocal naturalness and overall tonal coherence.\u003c\/p\u003e\n\u003cp data-start=\"2351\" data-end=\"2721\"\u003e🎯 \u003cstrong data-start=\"2354\" data-end=\"2393\"\u003eNote for Collectors and Technicians\u003c\/strong\u003e\u003cbr data-start=\"2393\" data-end=\"2396\"\u003eThese RCA Cunningham Radiotron 45 ST tubes strike a rare balance between historical value, construction quality, and musical finesse. The \u003cstrong data-start=\"2534\" data-end=\"2569\"\u003edual-brand RCA Cunningham label\u003c\/strong\u003e, typical of 1930s production, adds collectible appeal. A matched pair ideal not only for listening, but for \u003cstrong data-start=\"2678\" data-end=\"2720\"\u003eexperiencing the sound of a bygone era\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"2723\" data-end=\"2726\"\u003e\n\u003cp data-start=\"2728\" data-end=\"2970\"\u003e\u003cstrong data-start=\"2728\" data-end=\"2745\"\u003eTest Results:\u003c\/strong\u003e\u003cbr data-start=\"2745\" data-end=\"2748\"\u003eTested with \u003cstrong data-start=\"2760\" data-end=\"2793\"\u003eAMPLITREX AT-1000 Tube Tester\u003c\/strong\u003e\u003cbr data-start=\"2793\" data-end=\"2796\"\u003eMeasurements taken after 10 minutes of warm-up.\u003cbr data-start=\"2843\" data-end=\"2846\"\u003eTest conditions: Vf = 2.5V ; Va = 275V ; Vg = -54.8V\u003cbr data-start=\"2898\" data-end=\"2901\"\u003e100% Reference: Gm = 2000 ; Ia = 36 mA\u003cbr data-start=\"2939\" data-end=\"2942\"\u003e\u003cstrong data-start=\"2942\" data-end=\"2970\"\u003eTest Result: STRONG\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"2728\" data-end=\"2970\"\u003e\u003cstrong data-start=\"2974\" data-end=\"2985\"\u003eTube 1:\u003c\/strong\u003e Gm = 1760 ; Ia = 26 mA\u003c\/p\u003e\n\u003cp data-start=\"2728\" data-end=\"2970\"\u003e\u003cstrong data-start=\"3013\" data-end=\"3024\"\u003eTube 2:\u003c\/strong\u003e Gm = 1570 ; Ia = 25 mA\u003c\/p\u003e\n\u003cp data-start=\"3051\" data-end=\"3082\"\u003e\u003cstrong data-start=\"3051\" data-end=\"3082\"\u003eAdditional Tests Performed:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong data-start=\"3086\" data-end=\"3103\"\u003eMicrophonics:\u003c\/strong\u003e Standard – Tested and approved for hi-fi and guitar amp use.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong data-start=\"3169\" data-end=\"3190\"\u003eEmission Quality:\u003c\/strong\u003e Excellent – Very strong and stable emission, with no fluctuations.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong data-start=\"3262\" data-end=\"3279\"\u003eShorts \u0026amp; Gas:\u003c\/strong\u003e None detected.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3296\" data-end=\"3299\"\u003e\n\u003cp data-start=\"3301\" data-end=\"3317\"\u003e\u003cstrong data-start=\"3301\" data-end=\"3315\"\u003eCondition:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eVintage tubes – tested and fully functional.\u003c\/li\u003e\n\u003cli\u003eSupplied in our \u003cstrong data-start=\"3385\" data-end=\"3410\"\u003ecustom protective box\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong data-start=\"3416\" data-end=\"3431\"\u003eFunctional:\u003c\/strong\u003e Fully operational.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong data-start=\"3455\" data-end=\"3478\"\u003eCosmetic Condition:\u003c\/strong\u003e Very Good – Print is clearly legible; light signs of age but no major flaws. See photos for details.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong data-start=\"3584\" data-end=\"3607\"\u003eManufacturing Code:\u003c\/strong\u003e Not present – manufacturing period based on internal structure. Made in USA, 1930s.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"RCA","offers":[{"title":"Default Title","offer_id":55039873417564,"sku":"03011","price":249.9,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/8_a321d9b2-6138-4f0e-8553-02de0de6428f.jpg?v=1752843590","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/45-st-rca-cunningham-nos-black-plates-foil-dimpled-getter-matched-pair-radiotron-tubes-made-in-usa-1930s-en-1","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}