{"product_id":"ma-1500-monoblock-power-amps","title":"MA-1500 Monoblock power amps","description":"\u003cdiv\u003eMain feature\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eToshiba 6CG7 for the transformer-coupled circuit driving PSVAN 300B ended-tube optimally\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eLetting the ended-tube PSVAN 300B to be the self-bias single pure A-class, the Toshiba 6CG7 as a driver is used on the transformer-couple and operates the speakers with stability having no wobbling but is structured to exert the excellence of 300B's original quality with the simplest operation.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eComposing the non-feedback amplifier by adopting triode tubes in all stages\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWe compose the non-feedback amplifier by adopting triode tubes, 5814A+6CG7+300B, in all stages. Therefore, the ability for reproducing dynamic and very expressive music is provided only possible from the non-feedback circuit.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eAdopting the output transformer and inter-stage transformer made by LUNDAHL in Sweden\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eBecause the inter-stage and output transformers made by LUNDAHL in Sweden are proper to compose this equipment and suited for the sound quality to be aimed by us, we have adopted them.　We adopted parallel connection by utilizing the independent winding structure at the secondary side of the inter-stage transformer and therefore secured a sure transmission to the level of very small signals. The independent terminals able to drive an 8 or 4 ohm speaker are provided by utilizing the independent winding structure at the secondary side of the output transformer.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eComposed of two independent power choke transformers\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eBecause the power supplies from the independent power choke transformer are individually supplied for the first stage, the driver stage (5814A+6CG7), and the power stage (300B single-ended), the mutual interference between the input signal amplifier circuit and the speaker drive circuit is purged. Therefore, signals of various levels from infinitesimal signals to high power signals are amplified clearly.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eThoroughgoing design for decreasing the noise\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eWe have adopted the thoroughgoing design for decreasing the noise with the follows:\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eRectifier tube 5R4G which does not generate a switching noise in principle against a high voltage power supply\u003c\/div\u003e\n\u003cdiv\u003eRectifier circuits composing of choke transformers\u003c\/div\u003e\n\u003cdiv\u003e300B heaters directly driven by DC power supplies\u003c\/div\u003e\n\u003cdiv\u003eMA-1500 Block Diagram\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eProduct Specification\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eProduct\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e300B Single-Ended Monaural Power Amplifier\u003c\/div\u003e\n\u003cdiv\u003eInput impedance\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e47k ohms\u003c\/div\u003e\n\u003cdiv\u003eGain\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e26dB\u003c\/div\u003e\n\u003cdiv\u003eResidual noise\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e200µV or less : A-NET\u003c\/div\u003e\n\u003cdiv\u003eRated output\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e10W or more　(THD：5%)\u003c\/div\u003e\n\u003cdiv\u003eFrequency characteristics\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e10 - 40kHz (+0,-3dB)\u003c\/div\u003e\n\u003cdiv\u003eOutput impedance\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e4 ohms,　8 ohms\u003c\/div\u003e\n\u003cdiv\u003ePower consumption\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e100W (100VAC　50～60Hz)\u003c\/div\u003e\n\u003cdiv\u003eExternal dimensions (mm)\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e245 (W)×226(H)×427(D)\u003c\/div\u003e\n\u003cdiv\u003eWeight\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003e16ｋｇ\u003c\/div\u003e\n\u003cdiv\u003eAccessories\u003cspan class=\"Apple-tab-span\"\u003e \u003c\/span\u003eAC power cable\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Phasemation","offers":[{"title":"Default Title","offer_id":56442867056806,"sku":null,"price":23975.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0433\/9082\/8710\/files\/photo-4.png?v=1778087856","url":"https:\/\/donbetteraudio.com\/products\/ma-1500-monoblock-power-amps","provider":"Don Better Audio","version":"1.0","type":"link"}