Basie is hand built to the finest standards. Based around the excellent and extremely popular EL34 power tube, this is a ground up design between Ray Waters and Erhard Audio.
Various different model tubes are used for Basie, each tube type was chosen because it perfectly suits the given application and circuit. For each tube type, there are many NOS available on the market to allow for trying out different brands. The tubes used in Basie are 12DW7, 12AY7, 12AU7 and of course EL34.
We do however recommend that tube rolling is kept to a minimum as consistent tube rolling can loosen tube socket pins which will then cause a number of operational issues!
To ensure many years of trouble free operation, Baise comes with an Auto Bias module, which is pre set by us for optimum operation and life span of the EL34 tubes! The Auto Bias module will ensure that each tube is kept at the pre set bias level, ensuring a fully balanced push pull output stage!
The other positive in using an Auto Bias module is that the guesswork of keeping an optimum bias level is taken out of the equation!

The tone control preamp section uses the 12DW7 triode, which is a unique tube in that one triode has the specs of a 12AU7 and the other triode has the specs of a 12AX7, so basically 2 different tubes in one! These work in conjunction with ultra low noise MOSFET's resulting in an excellent tone control preamp. The tone controls can be switched out of the circuit for those listening sessions where a classic line preamp is desired.
The power amp driver section uses one each 12AY7 and 12AU7 per channel. The 12AY7 is inherently well suited for the input section as it was designed to be used in a low audio signal environment.
The circuit uses temperature compensated LM334 based CCS (Constant Current Source) ensuring that the driver tubes operate at their optimum and safe levels.
Power Supply:
For the high voltage B+ required for the power tubes and amp driver, we use a CRC power supply, the same power supply we use in our models Elvis and Buddy, a well proven performer!
For the tone control preamp power supply, we use regulated B+ as well as regulated DC filament supplies. Again, these circuits are identical to the ones we use in all our preamps, with a well proven track record!
Only high quality components are used in the construction of Basie. Low noise, +/-1% variation metal film resistors are used throughout the signal circuit, as are high quality Panasonic metal oxide resistors in the power supply circuit. Nichicon electrolytic capacitors are used in the all-important power supply. Film capacitors are WIMA, Panasonic and Solen for the coupling capacitors.
The printed circuit board is designed in house and manufactured to FR4-TG standards. It is double layer with full ground planes on both sides to ensure complete screening of the circuits.
All tubes are a factory new.
General specs:
Amplifier output - 35W/CH stereo
Frequency response is +/- 0.5dB 20Hz to 35KHz
Signal to noise -86dB
Chassis size: 15"W x 12"D x 8"H
Weight: 38lb