{"product_id":"thoress-300b-single-ended-triode-mono-power-amplifier","title":"THÖRESS 300B Single-Ended Triode Mono Power Amplifier","description":"\u003cp\u003eBestillingsvare, forvent 4-8 ugers leveringstid!\u003c\/p\u003e\n\u003cp\u003eThe SE300B Mono Amplifier is an all-tube power amplifier employing the famous\u003cbr\u003e300B filamentary triode in single-ended (Class-A) operation mode for an output of\u003cbr\u003eup to 10 watts into a 4, 8 or 16 ohm loudspeaker load.\u003cbr\u003eThe power tube is modulated by an extraordinary single-stage taylored around a pair\u003cbr\u003eof 2xEL822\/CV2382 power tubes operated in triode mode with high idle current.\u003cbr\u003eAnd is combined with a proprietray C-core output transformer (OPT) produced inhouse to meet the highest possible standards and to perfectly suit the circuit\u003cbr\u003econtext. These design choices are to a large extent responsible for the richly\u003cbr\u003etextured, clear, warm and dynamic sonic presentation of our amplifier. The SE300B\u003cbr\u003eMono Amplifier is an ultimate component which easily measures up to the highest\u003cbr\u003eexpectations of even the most critical and experienced music lover. And as such a\u003cbr\u003eperfect complement to our DFAmp or FFPre.\u003cbr\u003eBUILT\u003cbr\u003eThe amplifier is built with meticulous hand construction using our proven point-topoint wiring techniques. Much care has been taken in arranging each aspect of the\u003cbr\u003einternal construction to ensure low noise performance, ease of service and the\u003cbr\u003ehighest reliability for many years to come.\u003c\/p\u003e\n\u003cp\u003eTOPOLOGY\u003cbr\u003eThe amplifier is entirely based on SINGLE-ENDED ZERO-FEEDBACK schematics.\u003cbr\u003eDecidedly ignoring the fact that many music lovers still persistently believe in the\u003cbr\u003emyth that balanced technology (and the associated cable configuration with XLR\u003cbr\u003econnectors) is generally superior to single-ended concepts. Readers who want to\u003cbr\u003elearn more about our view on balanced techniques and our general design approach\u003cbr\u003eare encouraged to read the paper (THÖRESS - Behind the Curtain) downloadable on\u003cbr\u003ethe ABOUT button of our website.\u003c\/p\u003e\n\u003cp\u003eLOW NOISE OPERATION\u003cbr\u003eSpecific design choices guarantee low noise operation of the amplifier, even when it\u003cbr\u003eis combined with a highly efficient loudspeaker. At first, the 300B triode is DC heated\u003cbr\u003ewhereas the cathode point of the output circuit can be balanced with respect to the\u003cbr\u003efilament of each individual 300B tube by means of a rotary potentiometer. Once the\u003cbr\u003ebalance adjustment has been made, the signal current is distributed evenly over\u003cbr\u003eboth ends of the filament and residual hum due to heater voltage ripple vanishes!\u003cbr\u003eSecondly, the amplifier has been specifically designed to have a moderate gain (low\u003cbr\u003einput sensitivity). This design choice helps to avoid idle noise issues (and ensures\u003cbr\u003econveniently fine volume adjustment) in a wide variety of setup scenarios.\u003cbr\u003eMAINS TRANSFORMER\u003cbr\u003eThe SE300B mono amplifier is equipped with a mains transformer produced inhouse to ensure the highest possible quality and reliability. This part has been\u003cbr\u003eoptimized for low body noise emission and low leakage. Nevertheless, it is mounted\u003cbr\u003eto the chassis via isolation elements in order to eliminate even the slightest\u003cbr\u003einterference of residual transformer vibrations with the circuit. Since the mains\u003cbr\u003etransformer is produced in-house we can readily customize the amplifier for all kinds\u003cbr\u003eof mains voltages, such as 230Vac, 100Vac (Japan), 120Vac (USA, Canada), 220Vac\u003cbr\u003e(South Korea, China, Thailand, Indonesia), 240Vac (UK) or 245 Vac (Australia).\u003c\/p\u003e\n\u003cp\u003eF E A T U R E O V E R V I E W\u003cbr\u003e• All-Tube Mono Power Amplifier utilizing the famous classic\u003cbr\u003e300B filamentary power triode in single-ended (class-A) operation mode.\u003cbr\u003e• 2x10 watts of output power.\u003cbr\u003e• Powerful single-stage driver utilizing two EL822\/CV2382 pentodes\u003cbr\u003eoperated in triode mode at high idle current.\u003cbr\u003e• Minimalist (pure class-A) zero-feedback schematic.\u003cbr\u003e• Ultimate tape wound cut core (C-core) output transformer\u003cbr\u003emanufactured in-house.\u003cbr\u003e• Precise 4, 8 and 16 ohm loudspeaker load matching via jumpers soldered\u003cbr\u003eto the secondary terminals of the output transformer.\u003cbr\u003e• C-core filter choke made in-house.\u003cbr\u003e• High grade foil-in-oil capacitors made in Germany in the power supply.\u003cbr\u003e• Ultra-low noise mains transformer produced in-house for 230Vac, 100Vac\u003cbr\u003e(Japan), 120Vac (USA, Canada), 220Vac (South Korea, China, Thailand, Indonesia),\u003cbr\u003e240Vac (UK) or 245 Vac (Australia).\u003cbr\u003e• Full hand construction, point-to-point wiring throughout.\u003c\/p\u003e\n\u003cp\u003eNon-magnetic (aluminum) case, anodized printing on front and rear panel,\u003cbr\u003epowder-coated chassis and lids.\u003cbr\u003e• Dimensions: 150x595xH330 mm,\u003cbr\u003e330=20\/feet+210+100\/power tube over case,\u003cbr\u003e595=575+20\/speaker binding posts;\u003cbr\u003e• weight: 14 Kg each Mono Block.\u003cbr\u003e• Dimensions of the shipping crate: 950x400xH460 mm.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Thöress","offers":[{"title":"Default Title","offer_id":56854632595787,"sku":null,"price":78500.0,"currency_code":"DKK","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0994\/7991\/2779\/files\/thoeress-se300b-1.jpg?v=1774088526","url":"https:\/\/sallingboeaudio.com\/products\/thoress-300b-single-ended-triode-mono-power-amplifier","provider":"Sallingboe Audio","version":"1.0","type":"link"}