This design project began with the goal of crafting an entire amplifier that echoed the form of a vacuum tube itself. See here for example of the intial execution. Thanks to cabinet-maker N.N. for the beautiful walnut frames.
The 22277 is a two-channel audio amplifier for home music-listening. Power output is approximately seven watts per channel. Each channel uses 1/2 of a 6SL7 twin triode and one 6L6. The rectifier used is a 6AX5.
Volume control is provided. Inputs are via twin RCA jacks and speaker outputs are via 1/4″ jacks. The relatively high gain of the 6SL7 tube allows the unit to be driven to full output from any line-level source (E.G., radio tuner, DVD player, iPod, etc).
3 replies on “Sound From A Glass Box”
This looks very nice.
It would be cool to build one in a circle form and cover it with a bell jar like an old ticker tape machine. Stereopile had one a few years ago that used 4CX250s or some similar blower cooled tubes that was in a cylinder and filled with a clear oil for coolant. It looked like an embalming machine to me, and I never saw a picture of it again. An oil leak would be a domestic disaster because you’d never get it out of the carpet.
//www.ebay.de/itm/Rohde-Schwarz-QAO-Quarz-Oszillator-Baugruppe-Modul-fur-Ballempfanger-/320656732935?pt=Radio_TV_Musik&hash=item4aa8a17307
See the picture for an idea…..just bigger and with a flat base. Atwater Kent made a radio like this too IIRC.
I know what you are thinking. Heat retention.
But the glass has a lot of surface area. For a low power amp it would be fine. You could also put a quiet low power fan in the base and put in some holes for forced circulation. The bell jar can go through the dishwasher once in a whole if dust builds up.