{"product_id":"highland-dynamics-dual-delta-4-7","title":"Highland Dynamics Dual Delta 4-7","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eHighland Dynamics Dual Delta 4-7\u003c\/strong\u003e is a two-channel tube microphone preamp with a DI section, drawn from a 1960s British circuit. The path is transformer balanced at both ends and every unit is wired by hand, point to point.\u003c\/p\u003e\n\u003ch3\u003eGain set by feedback, not by a pad\u003c\/h3\u003e\n\u003cp\u003eThe four gain modes, Low, Medium, High and Open, differ in how much negative feedback the circuit applies. Less feedback means more gain and more pronounced character. In Open mode there is no feedback at all, so the preamp runs at maximum gain and maximum tone. That makes the gain switch a tonal decision rather than only a level setting.\u003c\/p\u003e\n\u003ch3\u003eParts chosen for character, not for cost\u003c\/h3\u003e\n\u003cp\u003eAn EF86 handles the gain stage and a 6DJ8 drives the output. The signal path carries West-Cap, Vitamin Q and NYT paper-in-oil capacitors alongside 2-watt carbon composition resistors, with solid-core copper wiring throughout. Gain and bass cut are set on Grayhill rotary switches, so both channels can be matched exactly and a setting can be recalled for an overdub.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo channels of microphone preamplification with a DI section\u003c\/li\u003e\n\u003cli\u003eTransformer-balanced input and output\u003c\/li\u003e\n\u003cli\u003eFour feedback-controlled gain modes: Low, Medium, High, Open\u003c\/li\u003e\n\u003cli\u003eEF86 gain tube with a 6DJ8 output tube\u003c\/li\u003e\n\u003cli\u003eGrayhill rotary switches for gain and bass cut\u003c\/li\u003e\n\u003cli\u003eWest-Cap, Vitamin Q and NYT paper-in-oil capacitors\u003c\/li\u003e\n\u003cli\u003e2-watt carbon composition resistors and solid-core copper wiring\u003c\/li\u003e\n\u003cli\u003eHand-built with point-to-point wiring\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: tube microphone preamp and DI\u003c\/li\u003e\n\u003cli\u003eChannels: 2\u003c\/li\u003e\n\u003cli\u003eBalancing: transformer coupled at input and output\u003c\/li\u003e\n\u003cli\u003eGain tube: EF86\u003c\/li\u003e\n\u003cli\u003eOutput tube: 6DJ8\u003c\/li\u003e\n\u003cli\u003eGain modes: Low, Medium, High, Open\u003c\/li\u003e\n\u003cli\u003eGain and bass cut control: Grayhill rotary switches\u003c\/li\u003e\n\u003cli\u003eSignal path capacitors: West-Cap, Vitamin Q, NYT paper in oil\u003c\/li\u003e\n\u003cli\u003eResistors: carbon composition, 2 W\u003c\/li\u003e\n\u003cli\u003eWiring: solid-core copper, point-to-point construction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Highland Dynamics","offers":[{"title":"Default Title","offer_id":54555252523345,"sku":"60777","price":4229.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/HighlandDynamicsDualDelta4-71.jpg?v=1786971317","url":"https:\/\/wrdtunes.com\/fr\/products\/highland-dynamics-dual-delta-4-7","provider":"Wired Tunes","version":"1.0","type":"link"}