Level 1 upgrade, (exisitng BC21 preamp is required)
*External power supply same size as the BCG3. Size approx: 5.25"w x 8."d x 3.5"h
*on board power supply filtering increased by 200%
*output caps replaced by Blue Circle polypropylene type
*HexFred rectifier in external power supply
*Shallco 62 step attenuator replaces the original volume pot
*gold plated selector switch replaces the original plastic switch
*custom Blue Circle DC power cord between preamp and power supply
Level 2 upgrade, (exisitng BC21 preamp is required)
*external power supply same size as the BCG3.1. Size approx: 5.25"w x 14.5"d x 5.125"h
*on board power supply filtering increased by 200%
*high speed polypropylene caps as main filter in on board B+ supply
*out board power supply filtering double as on board filtering capacity
*output caps replaced by Blue Circle film and foil type
*true dual power supply for separate B+ supply for each tube
*dual HexFred rectifier in external power supply
*Shallco 62step attenuator replaces the original volume pot
*gold plated selector switch replaces the original plastic switch
*custom Blue Circle DC power cord between preamp and power supply
Level Sugarbrie
*all new chassis preamp and power supply
*totally custom preamp using one pair of 6SN7 supplied by customer
*external power supply and preamp chassis size exactly the same as the original version of the BC3000.
*Preamp size: 17.5"w x 14.5"d x 5.125"h
*dual external and on board power supply for B+
*power supply technology using AG3000 type design
*dual HexFred rectifier in external power supply
*Blue Circle film and foil output caps double level 2 upgrade for better bass performance
*dual Shallco attenuator with 62 steps
*dual gold plated selector switch
*5 line level inputs and one loop
*two pairs of main preamp outputs
*tubes are mounted vertically in the preamp
*custom Blue Circle DC power cord between preamp and power supply
