Modjeski essentially tells his life's story--from his early childhood experiences with tube amplifiers
, to his to running a hi-fi repair shop in Richmond, Virginia, to opening a high-end store, to working for Harold Beveridge, and to finally founding Music Reference in 1981.
For example, traveling wave tube amplifiers
(TWTAs) typically are operated in saturation so the amplifier's power rating is the saturation power.
First, most tube amplifier
designs sound different from most solid state designs.
In recent years, significant advances have been made in solid-state technology that have resulted in solid-state power amplifiers (SSPA) becoming a truly viable alternative to the traveling-wave tube amplifier
(TWTA) for microwave high power amplifier applications.
Sources describe DO-SAR ARMS as incorporating a traveling wave tube amplifier
, a solid-state receiver, multilook processing, digital signal and frequency generation, a datalink subsystem and differential Global Positioning System motion compensation.
There are still folks who swear by tube amplifiers
. These amplifiers really can sound different, largely because their frequency response tends to deviate from flat with different speaker loads, but by and large, the differences are probably not worth getting excited about -- speaker placement in the room will affect the sound much more than will switching from a transistor to a tube amplifier
I believe this old tweak tale got its start from the heyday of the tube amplifier
when aging tubes had to constantly be rebiased for their always changing electrical parameters.
For example, suppose tube amplifier
J costs $550 and puts out 20 watts per channel into 4 ohms.
According to the company, the new products include: Audio Dock with Vacuum Tube Amplifier
(model DA-E750) and Audio Dock for Galaxy S and Apple devices (DA-E670).