{"product_id":"octave-filter","title":"Octave filter Qty 1","description":"\u003cdiv class=\"flex flex-col text-sm pb-25\"\u003e\n\u003carticle class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:f63ec576-1344-422b-8877-ed3fa23b3eaa-61\" data-testid=\"conversation-turn-44\" data-scroll-anchor=\"true\" data-turn=\"assistant\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @w-sm\/main:[--thread-content-margin:--spacing(6)] @w-lg\/main:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"9b659fac-0ed0-4a20-9626-f6fb66f6def4\" dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-2\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[1px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp data-start=\"0\" data-end=\"905\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e7413-A octave filter unit manufactured by Standard Telephones and Cables Ltd., London. A professional electronic test instrument designed to isolate and analyse specific frequency bands within an audio or signal range. The front panel features dual frequency range charts, rotary selector controls, connection terminals and indicator markings for use with associated measuring equipment such as a psophometer.\u003c\/p\u003e\n\u003cp data-start=\"0\" data-end=\"905\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eOctave filters of this type were used in telecommunications engineering, broadcast testing and acoustic measurement to separate signals into defined frequency bands for analysis of noise, transmission quality and circuit performance. The robust metal case reflects laboratory and field service use. 1950s to 1960s, during the expansion of telecommunications testing and audio engineering measurement systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mt-3 w-full empty:hidden\"\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cp class=\"p1\"\u003eW39 x D28 x H27 cm.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eReplacement value £500\u003c\/p\u003e","brand":"Standard Telephones \u0026 Cables Ltd","offers":[{"title":"Default Title","offer_id":53096012579155,"sku":"OCT-708","price":50.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1012\/8674\/0307\/files\/Industrial_powerhouse_props_prop_rental_hire_vintage_movie_film_set_dec_octave_filter_standard_telephone_cables_electrical.jpg?v=1771863989","url":"https:\/\/powerhouseprops.co.uk\/products\/octave-filter","provider":"Powerhouse Props","version":"1.0","type":"link"}