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Blue Circle Audio
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The Custom Shop
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Level 1 upgrade, (exisitng BC21 preamp is required)

*External power supply dimensions approx: 4.25"w x 8.75"d x 5"h.

*on board power supply filtering increased by 200%

*output caps replaced by Blue Circle polypropylene type

*HexFred rectifier in external power supply

*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 dimensions 5.25" w x 5.25" h x 14" d.

*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

*gold plated selector switch replaces the original plastic switch

*custom Blue Circle DC power cord between preamp and power supply

Level Sugarbrie

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*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

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BC21 Upgrade
This upgrade is available to owners of a BC21 or BC21.1 only. The BC21 and BC21.1 are no longer production items.
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Contact:  bcircle@bluecircle.com  /  519-469-3215