{"title":"Preamplifiers","description":"\u003cp\u003eDirect-heated triode valve preamplifiers with valve rectified power supplies\u003c\/p\u003e","products":[{"product_id":"01a-preamplifier","title":"01A Preamplifier - 6AX4 Power Supply","description":"\u003ch3\u003eLow gain DHT 01A valve single ended stereo preamplifier with 6AX4 valve rectified power supply.\u003c\/h3\u003e\n\u003cp\u003eWith modern DACs pushing upwards of 2V output you may wonder what benefit a preamplifier could provide beyond input switching and a volume control? The 01A valve in your signal path will certainly convince you otherwise.\u003c\/p\u003e\n\u003cp\u003eEach 01A has its own individual DC regulated power supply heating the thoriated tungsten filaments, bringing a glow to the valves and to the sound. You won’t want to listen without them.\u003c\/p\u003e\n\u003cp\u003eVolume control is implemented via a high quality shunt attenuator providing perfect channel matching down to whisper quiet levels.\u003c\/p\u003e\n\u003cp\u003eA separate choke rectified power supply with the highest quality film capacitors provides a noise free foundation for the 01As to do their magic.\u003c\/p\u003e\n\u003ch4\u003eDefault Configuration\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e2 x 01A valves\u003c\/li\u003e\n\u003cli\u003e4 x 6AX4 rectifier valves\u003c\/li\u003e\n\u003cli\u003eColeman regulators for each filament DC supply with precision voltage adjustment via top mounted controls. DHT filament current draw can vary significantly between valves - adjustable regulation ensures low noise, great sound and long life for your valves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh gloss finish available in any RAL Classic colour (see \u003ca rel=\"noopener\" title=\"RAL Colour Chart\" href=\"https:\/\/www.ral-farben.de\/en\/all-ral-colours\" target=\"_blank\"\u003eRAL Colour Charts\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003eSolid hardwood 2\/3 width format cases in high grade ash, beech, cherry, maple, oak, sapele or walnut\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDual mono volume controls - stereo option available upon request\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.claritycap.co.uk\" title=\"ClarityCap\"\u003eClarityCap\u003c\/a\u003e TC polypropylene film capacitors\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.charcroft.com\" title=\"Charcroft Resistors\" rel=\"noopener\" target=\"_blank\"\u003eCharcroft\u003c\/a\u003e Z-Foil bias resistors\u003c\/li\u003e\n\u003cli\u003eHigh quality \u003ca href=\"https:\/\/products.elma.com\/collections\/selector-switches\" title=\"Elma rotary switches\" rel=\"noopener\" target=\"_blank\"\u003eElma\u003c\/a\u003e rotary switches\u003c\/li\u003e\n\u003cli\u003eTeflon valve sockets\u003c\/li\u003e\n\u003cli\u003ePoint to point UP-OCC 99.999% copper wired\u003c\/li\u003e\n\u003cli\u003eBlack knurled solid aluminium knobs\u003c\/li\u003e\n\u003cli\u003e4 x RCA Inputs (all active wired - passive option available)\u003c\/li\u003e\n\u003cli\u003e1 x RCA Output\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLifetime warranty to first owner\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCustom Options\u003c\/h4\u003e\n\u003cp\u003eThe design has been optimised to showcase the very best of the 01A however the platform will accommodate components from other manufacturers, including transformers, capacitors, resistors etc. Let us know what you have in mind.\u003c\/p\u003e\n\u003cp\u003eInputs can be wired passively, i.e. direct to the volume transformers, not requiring power and useful if you don't require any extra gain.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specification\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eGain: 5dB\u003c\/li\u003e\n\u003cli\u003eInput impedance: 100k ohms\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency Response 20Hz - 25KHz (+\/- 1dB)\u003c\/li\u003e\n\u003cli\u003eCathode biased\u003c\/li\u003e\n\u003cli\u003eZero negative feedback\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions (including valves): PSU: 28cm wide\/32 cm deep\/25cm high. Amplifier: 28cm wide\/32 cm deep\/26cm high\u003c\/li\u003e\n\u003cli\u003eWeight: PSU: 14kg. Amp: 13kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Davison Audio","offers":[{"title":"Default Title","offer_id":57098686890361,"sku":"01A-BASE","price":4995.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0969\/9891\/6473\/files\/01A_Base_v1_2026-Apr-20_08-39-49PM-Front.png?v=1776719709"},{"product_id":"01a-preamplifier-lundahl","title":"01A Preamplifier - Lundahl Transformers","description":"\u003ch3\u003eLow gain DHT 01A valve single ended stereo preamplifier with valve rectified power supply.\u003c\/h3\u003e\n\u003cp\u003eWith modern DACs pushing upwards of 2V output you may wonder what benefit a preamplifier could provide beyond input switching and a volume control? The 01A valve in your signal path will certainly convince you otherwise.\u003c\/p\u003e\n\u003cp\u003eEach 01A has its own individual DC regulated power supply heating the thoriated tungsten filaments, bringing a glow to the valves and to the sound. You won’t want to listen without them.\u003c\/p\u003e\n\u003cp\u003eVolume control is implemented via high quality autotransformers, the final word in signal attenuation. One per channel, preserving dynamics and signal quality down to whisper quiet levels.\u003c\/p\u003e\n\u003cp\u003eA separate choke rectified power supply with the highest quality film capacitors provides a noise free foundation for the 01As to do their magic.\u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"Lundahl Transformers\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0969\/9891\/6473\/files\/Lundahl_Logo.png?v=1776684162\"\u003e\u003c\/p\u003e\n\u003ch4\u003eDefault Configuration\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca rel=\"noopener\" title=\"Lundahl Transformers\" href=\"https:\/\/www.lundahltransformers.com\" target=\"_blank\"\u003eLundahl\u003c\/a\u003e transformers\u003c\/li\u003e\n\u003cli\u003e2 x 01A valves\u003c\/li\u003e\n\u003cli\u003eChoice of 816 mercury (2 x 816\/2 x 6AX4) or 6AX4 (4 x 6AX4) full wave bridge rectifier power supply. Mercury vapour valves require careful handling; preheating of the condensed mercury prior to applying power to the anodes is required. For the 816 valve this is approximately 30 minutes after any transportation and then 20 seconds each time the amp is switched on thereafter\u003c\/li\u003e\n\u003cli\u003eColeman regulators for each filament DC supply with precision voltage adjustment via top mounted controls. DHT filament current draw can vary significantly between valves - adjustable regulation ensures low noise, great sound and long life for your valves\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh gloss finish available in any RAL Classic colour (see \u003ca href=\"https:\/\/www.ral-farben.de\/en\/all-ral-colours\" title=\"RAL Colour Chart\" rel=\"noopener\" target=\"_blank\"\u003eRAL Colour Charts\u003c\/a\u003e)\u003c\/li\u003e\n\u003cli\u003eSolid hardwood 2\/3 width format cases in high grade ash, beech, cherry, maple, oak, sapele or walnut\u003ca rel=\"noopener\" title=\"Lundahl Transformers\" href=\"https:\/\/www.lundahltransformers.com\" target=\"_blank\"\u003e\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eDual mono \u003ca rel=\"noopener\" title=\"Intact Audio\" href=\"https:\/\/intactaudio.com\" target=\"_blank\"\u003eIntact Audio\u003c\/a\u003e autotransformer volume controls - stereo option available upon request\u003c\/li\u003e\n\u003cli\u003e\n\u003ca title=\"ClarityCap\" href=\"https:\/\/www.claritycap.co.uk\"\u003eClarityCap\u003c\/a\u003e TC polypropylene film capacitors\u003c\/li\u003e\n\u003cli\u003e\n\u003ca rel=\"noopener\" title=\"Charcroft Resistors\" href=\"https:\/\/www.charcroft.com\" target=\"_blank\"\u003eCharcroft\u003c\/a\u003e Z-Foil bias resistors\u003c\/li\u003e\n\u003cli\u003eTeflon valve sockets\u003c\/li\u003e\n\u003cli\u003ePoint to point UP-OCC 99.999% copper wired\u003c\/li\u003e\n\u003cli\u003eBlack anode caps, black knurled solid aluminium knobs\u003c\/li\u003e\n\u003cli\u003e4 x RCA Inputs (active wired - passive options available)\u003c\/li\u003e\n\u003cli\u003e1 x RCA Output\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLifetime warranty to first owner\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCustom Options\u003c\/h4\u003e\n\u003cp\u003eThe design has been optimised to showcase the very best of the 01A however the platform will accommodate components from other manufacturers, including transformers, capacitors, resistors etc. Let us know what you have in mind.\u003c\/p\u003e\n\u003cp\u003eInputs can be wired passively, i.e. direct to the volume transformers, not requiring power and useful if you don't require any extra gain.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specification\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eGain: 5dB\u003c\/li\u003e\n\u003cli\u003eInput impedance: 100k ohms\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency Response 20Hz - 25KHz (+\/- 1dB)\u003c\/li\u003e\n\u003cli\u003eCathode biased\u003c\/li\u003e\n\u003cli\u003eZero negative feedback\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions (including valves): PSU: 28cm wide\/32 cm deep\/27cm high. Amplifier: 28cm wide\/32 cm deep\/25cm high\u003c\/li\u003e\n\u003cli\u003eWeight: PSU: 14kg. Amp: 13kg\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Davison Audio","offers":[{"title":"816","offer_id":57105331618169,"sku":"01A-816","price":7295.0,"currency_code":"GBP","in_stock":true},{"title":"6AX4","offer_id":57105331650937,"sku":"01A-6AX4","price":6995.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0969\/9891\/6473\/files\/01A_Lundahl_2026-Apr-18_11-06-17PM-Front.png?v=1776680669"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0969\/9891\/6473\/collections\/Beautiful_Inside_And_Out.jpg?v=1786037693","url":"https:\/\/davison.audio\/collections\/preamplifiers.oembed","provider":"Davison Audio","version":"1.0","type":"link"}