{"product_id":"sylvania-45s-1930s-beautiful-matched-pair","title":"SOLD - 45's - Sylvania  - 1930's - Beautiful Matched Pair","description":"\u003ch3 data-end=\"174\" data-start=\"158\"\u003e\u003cspan style=\"color: rgb(255, 42, 0);\"\u003e\u003cem\u003eYOU WILL RECEIVE THE EXACT PAIR PICTURED.  CHOOSE QTY 1 TO RECEIVE THIS EXACT PAIR.\u003c\/em\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cstrong\u003eTV-7 Test Results:\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e70\/47\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e68\/47\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis is a \u003cstrong\u003emixed-brand pair\u003c\/strong\u003e with identical or extremely similar construction, strongly indicating the \u003cstrong\u003eSuper Silvertone\u003c\/strong\u003e is a \u003cstrong\u003eSylvania-manufactured rebrand\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThis was common practice: Sylvania supplied tubes to retailers like Sears (Silvertone was Sears' house brand for radios, phonographs, and electronics), who applied their own labeling for in-house products or replacement sales. \"Super\" denoted premium\/selected stock.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eKey Identification and Construction Details\u003c\/h3\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvelope\u003c\/strong\u003e: Both have the classic \u003cstrong\u003eST (\"coke-bottle\" or shoulder tube)\u003c\/strong\u003e glass shape — the standard mid-1930s form factor after earlier globe (rounded) UX-245 versions. Clear glass with domed tops.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase\u003c\/strong\u003e: Black molded Bakelite\/plastic with 4 pins (UX4 base). The Sylvania has \"SYLVANIA MADE IN U.S.A.\" etched in green, plus the \"45\" in a hexagon (a Sylvania signature for many 1930s–1940s tubes; hexagon often holds date\/plant codes, though not fully visible here).\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSilvertone specifics\u003c\/strong\u003e: \"Super Silvertone MADE IN U.S.A.\" in cursive script on the black base. This aligns with Sears' upscale branding; many Super Silvertone 45s are confirmed Sylvania-made (especially black-base ST versions with similar getters\/plates).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eInternals\u003c\/strong\u003e (from bottom shots):\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eHanging filament\u003c\/strong\u003e structure (visible wires\/supports) — classic directly heated triode.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePlates\u003c\/strong\u003e: Appear dark\/blackish or gray-black (likely carbonized black plates or coated gray-black), common in higher-quality mid-era 45s for better heat dissipation and reduced microphonics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGetters\u003c\/strong\u003e: Bottom foil\/D-getter (rectangular or D-shaped flashing at the base) — typical for Sylvania and rebrands in this period. Copious flashing suggests good vacuum integrity.\u003c\/li\u003e\n\u003cli\u003eNo major structural differences — internals match closely (same filament supports, mica spacers, plate shape), confirming same-factory origin.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"auto\"\u003eHistorical Context\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eSylvania produced excellent 45s  — rugged, consistent, low noise. Sears sourced from top makers (RCA, Sylvania, etc.) for Silvertone products; \"Super Silvertone\" indicated higher-grade testing\/cosmetics. These black-base ST examples fit mid-to-late 1930s production (post-globe era, pre-WWII shortages).\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003ePerformance and Sound Reputation\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eVintage U.S.-made 45s like these are favorites for their \"queen of tone\" qualities:\u003c\/p\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eRich, blooming midrange with exceptional vocal\/instrument texture.\u003c\/li\u003e\n\u003cli\u003eSweet, extended highs without glare.\u003c\/li\u003e\n\u003cli\u003eControlled but not overly damped bass.\u003c\/li\u003e\n\u003cli\u003eLow distortion (mostly even-order harmonics) for natural \"bloom\" and 3D imaging in SET amps.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003e\u003cstrong\u003eSylvania versions\u003c\/strong\u003e (including rebrands) are often described as detailed, linear, and dynamic — slightly more \"open\" or neutral than warmer RCAs, with excellent microphonic control and low hum when filaments are balanced. Super Silvertone variants perform identically when Sylvania-made — some collectors note quiet\/refined examples due to selection.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eComparisons:\u003c\/h3\u003e\n\u003cul dir=\"auto\"\u003e\n\u003cli\u003eVs. RCA 45: Sylvania\/Silvertone often preferred for clarity\/extension; RCA black-plate versions lusher\/thicker.\u003c\/li\u003e\n\u003cli\u003eVs. Tung-Sol or Ken-Rad: Similar ruggedness; Sylvania edges in refinement.\u003c\/li\u003e\n\u003cli\u003eVs. globe UX-245: ST shapes like yours more reliable (less getter flaking), comparable\/better sound in tested examples.\u003c\/li\u003e\n\u003cli\u003eVs. modern 45s (JJ, Emission Labs, Takatsuki): Vintage U.S. superior for musicality\/naturalness\/low noise — though modern ones more reliable\/higher output.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp dir=\"auto\"\u003eOverall, this is a nice, authentic 1930s U.S.-made pair — reliable Sylvania quality with historical charm. The similar construction despite labels makes them effectively a matched pair in practice.\u003c\/p\u003e","brand":"Bespoke Audio Shop","offers":[{"title":"Default Title","offer_id":53295004385646,"sku":"BSA-24","price":269.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/2721\/8030\/files\/BSA-24a.jpg?v=1770738375","url":"https:\/\/bespoke-audio-shop.myshopify.com\/products\/sylvania-45s-1930s-beautiful-matched-pair","provider":"Bespoke Audio Shop","version":"1.0","type":"link"}