{"product_id":"alan-eaton-45-monos-1-5-mighty-class-a-watts-spectacular","title":"Alan Eaton \"45\" Monos - 1.5 Mighty Class A Watts, Spectacular!","description":"\u003cp\u003eHere we have \u003cstrong\u003eAlan Eaton \"45\"\u003c\/strong\u003e tube monos that have a cult like following,...  The 45 monos are a triode tube class A audio amplifiers. \u003cstrong\u003eOrion power transformer\u003c\/strong\u003e and \u003cstrong\u003eTamura output transformers\u003c\/strong\u003e. Each amplifier is hand wired, point to point, with no circuit boards or semiconductors. The amplifiers come with all the tubes required. Each amplifier produces approximately 1.5 mighty watts. The simple design eliminates as many components as possible to reduce interference with the input signal. The physical layout of the amplifier reduces magnetic coupling with the signal path. \u003cbr\u003e \u003cbr\u003eThese amplifiers work well with high efficiency speakers at 8 ohms. Other impedance values will work but the power output will not be optimal. The amplifier expects standard input source voltages. A regular CD player or other source device can be used with or without a preamplifier.\u003cbr\u003e \u003cbr\u003eA lot of the parts used in the building of these amplifiers are vintage, either sourced from other equipment, or as new\/old stock surplus.\u003cbr\u003e \u003cbr\u003e- Electro Cube audio grade Mylar capacitors.\u003cbr\u003e- All silver Teflon coated wire used in the signal path.\u003cbr\u003e- Point to point hand wiring.\u003cbr\u003e- Alpha gain controls.\u003cbr\u003e- Vintage Orion brand power transformer.\u003cbr\u003e- Vintage Tamura brand output transformers.\u003cbr\u003e- Superior brand 3-way speaker connectors.\u003cbr\u003e- Vintage Military-grade new old stock surplus Amphenol tube sockets.\u003cbr\u003e- Clean deck no excessive screws bolts hardware or nuts showing.\u003cbr\u003e- Open chassis not congested with tubes two close together.\u003cbr\u003e- Vintage Military surplus hum rheostat.\u003cbr\u003e- Hammond brand filament transformer.\u003cbr\u003e- Custom manufactured steel chassis with powder coating finish.\u003cbr\u003e \u003cbr\u003eEach amplifier has a volume control and power indicator light on the front of the chassis. If you use a preamplifier, you can adjust the volume control to full volume. These amplifiers input signal can be supplied directly by CD player, DAC or other audio source devices. The volume control makes the use of a preamplifier unnecessary if desired. The volume control also helps set the channel volume level to adjust for tube power level differences from channel to channel.\u003cbr\u003e \u003cbr\u003eEach chassis is eighteen-gauge steel, laser cut, and seam welded on all four corners. The bottom is attached with eight screws, four on each corner. The coating is polyester powder coating, electrically adhered and then baked on for high durability. A variety of colors are available including high gloss, matte, or textured finish.\u003cbr\u003e \u003cbr\u003eEach amplifier has an adjustable \"hum balance\" or \"hum cancel\" circuit. This can be adjusted to cancel out the hum by injecting small DC voltage into preamp heater circuit. This small voltage effectively shifts the magnetic field of the heater such it does not interfere with other components in the amplifier. The \"hum cancel\" circuit can be adjusted by a small knob on the back of the amplifier. \u003c\/p\u003e\n\u003cp\u003eSo clearly these amps aren't for everyone but we have been enjoying them with one of our own custom Altec Valencia systems and yikes, they are magnificent. The first watt is always the most important and these being Class A make the classic Altecs sing. Condition is like-new and spotless.\u003c\/p\u003e\n\u003cp\u003eCome demo these here in Andover.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAlan Eaton \"45\" Monoblock Tube Amplifiers: $1,399.00 plus shipping and sales tax when applicable\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Holt Hill Audio","offers":[{"title":"Default Title","offer_id":43640422400067,"sku":null,"price":1399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2197\/6387\/files\/PhotoAug072026_12325PM.jpg?v=1786124884","url":"https:\/\/holthill.com\/products\/alan-eaton-45-monos-1-5-mighty-class-a-watts-spectacular","provider":"Holt Hill Audio","version":"1.0","type":"link"}