BLACK ART AUDIO

Designers and manufacturers of hand wound transformers for audio.

Black Art Single Ended Output Transformers

Conventional series

This series employs EI Laminations, polymer and paper insulation materials to produce an output transformer with a warm to neutral character. For those constructors looking for a more romantic & classic valve presentation. Black bell ended housing with flying leads

Model	Anode Load [Ohm]	Bias Current [mA]	Primary resistance	Frequency Response full power in circut	Matching valve (suggested)	Dimensions LxWxH [mm]	Weight [kg]	Finish	Price AUD$
2k5:8/4-60EIB	2500	60	47	10 Hz - 35 kHz	2A3	125x125x125	5	Bell ends	250
2k7:8/5-80EIB	2750	80	47	10 Hz - 35 kHz	300B	125x125x125	5	Bell ends	250
11k:8/4-60EIB	11000	60	100	25 Hz - 20 kHz	211/VT-4C	125x125x125	5	Bell ends	385

Reference series

Much more transparent and neutral than the "conventional" series. Double C core construction gives greater low level detail and attack. These units can be very neutral and sometimes ruthless in there articulation of the information and should only be partnered with the best possible components and circuits. The Teflon (P.T.F.E.) dielectric inter layer insulation provides the minimum possible dielectric absorption adding that extra transparency to the highest frequencies. The "cased" units are housed in fitted black case aluminium and stainless steel case work with flying leadouts.

Model	Anode Load [Ohm]	Bias Current [mA]	Primary resistance	Frequency Response full power in circut	Matching valve (suggested)	Dimensions LxWxH [mm]	Weight [kg]	Finish	Price AUD$
6k:8-20CT	6000	20	55	18 Hz - 35 kHz	417A,3A/167	76x55x65	1	open	135
6k:8-20CT	6000	20	55	18 Hz - 35 kHz	417A,3A/167	76x55x65	1.1	cased	220
2k7:8/4-60CT.3	2750	60	47	10 Hz - 55 kHz	2A3/300B	125x125x125	5	cased	385
2k7:8/4-80CT.3	2750	80	47	10 Hz - 55 kHz	2A3/300B	125x125x125	5	cased	385
11k:8/4-60EI.14s	11000	60	100	25 Hz - 20 kHz	211/VT-4C	125x125x185	10	cased	635
10k:8/4-100EI.0	10000	100	150	25 Hz - 20 kHz	845	135x135x200	12	cased	800

Prices in Australian Dollars see Trade terms page for a guide to exchange rates and ordering information.

TECHNICAL

OPTIONS

Air gapped optimised for alternative bias currents . Copper sheilding case.

NOTES :

Frequency response is measured in circuit using the actual valve indicated in the "suggested valve" column. The response quoted is measured at the limit of class A operation and indicates the -1.0 dB points.

Single Ended transformers are designed to operate at a specific bias current. Using a different current WILL compromise bass performance and increase distortion which will result in a lumpy indistinct bass and a veiling of the midrange vocal articulation. If you intend to operate Black Art transformers above or below their rated bias please contact Black Art and we will adjust the air gap to suit your application.

Under Development

The following table contains a list of the output transformers currently under development at Black Art. They are listed for reference and are not yet at a sufficient stage of development to be unleashed into the big wide world. Should you require further information please contact Black Art.

Model	Anode Load [Ohm]	Bias Current [mA]	Primary resistance	Frequency Response full power in circut	Matching valve (suggested)	Dimensions LxWxH [mm]	Weight [kg]	Price AUD$
?	12-14k	30	~200	25 Hz - 20 kHz	10/10Y	100x105x105	4	?

?	4.6k	36	~100	20 Hz - 20 kHz	45	50x65x76	1	?

?	4.5k	55	~100	20 Hz - 20 kHz	300b, 50	125x125x125	5	?

?	6.8k	100	~100	20 Hz - 20 kHz	845	150x150x150	6	?