Audio Note™ Chokes and Inductors

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Please Note: several order codes have recently changed, items with new order codes are highlighted in grey. The former order code is listed for reference purposes only.

Group A Single-ended Outputs.

Old Order Code NEW ORDER CODE Recommended Valves Max Cl. A Power Primary/Secondary Impedances Size Max. Current

Price Ex. UK Vat

TRANS-144 TRANS-144-V2 300B/2A3/ 6B4G 15 w 2K5 - 4/8 Ohms 80x67x68mm  90mA SE 75.00

Group B, Single-Ended Outputs

Order Code Recommended Valves

Max Cl. A Power

Primary - Secondary Impedances Size Maximum Current Price Ex. UK Vat
TRANS-152 300B/2A3/6B4G

25 w

2K5  -  4/8 Ohms 117x98x90

mm

90 mA  SE     140.00
TRANS-180 211/VT4C or 845

75 w

5K    -   4/8 Ohms 137x115x145 mm 240 mA  PSE     350.00

Group B, Push Pull

TRANS-200 EL84/ECL86/6V6 15 w 8K   -    4/8 Ohms 80 x 67 x 68 mm PP 80.00
TRANS-185 EL34/6L6G/5881 25 w 6K   -    4/8 Ohms 88 x 73 x 80 mm PP 110.00

Group C, Audio Note™ Double C-Core Output Transformers


Picture shows two TRANS-300 (TXO-300) with double C-core and I-E core respectively, plus one TRANS-027 (TXP-028) all with optional solid copper shrouds.

Product Ranges, Construction & Mounting details

Bifilar and Trifilar wound double C-core output transformers designed for the 300B or single 2A3 with 2K7 primary impedance and 4 & 8 Ohm secondaries for single ended operation, 90mA Standing Current, 50 Watts.

Size 115 mm x 102 mm x 136 mm, mounting holes centre to centre 87 mm to 84 mm both sides.

The standard version of the TRANS-300 (TXO-300) type output transformers comes with steel frames, however, as a higher quality option we do offer them with solid copper shrouds for an additional 72.00 per transformer, the copper shroud being non-magnetic improves not only RF influx, but also low level behaviour as it does not short out the airgap on the higher permeable cores like the AN Ultra HiB and the nickel cores this is essential for optimal performance.

All Copper – Copper transformers have copper lead out wires, Copper – Silver have copper wire on the primary and Audio Note silver leadout wires on the secondary and silver naturally silver wire all round.

Single 300B Output Transformers

Prices are for ONE transformer!

Old Order Code NEW ORDER CODE Recommended Valve Wiring Primary - Secondary Core Material Price Excl. UK Vat
TRANS-300/IE T300-1-IE-H306H306-F 300B SE, 2A3 SE Copper/Copper M4 I-E Core 375.00
TRANS-300 T300-1-I-H306H306-F 300B SE, 2A3 SE Copper/Copper AN Improved HiB 644.00
TRANS-300/01 T300-1-S-H306H306-F 300B SE, 2A3 SE Copper/Copper AN Super HiB 854.00
TRANS-300/01-A T300-1-U-H306H306-F 300B SE, 2A3 SE Copper/Copper AN Ultra HiB 1,162.00
TRANS-300/02 T300-2-S-H306-SPA-F 300B SE, 2A3 SE Copper/Silver AN Super HiB 1,881.60
TRANS-300/02-A T300-2-U-H306-SPA-F 300B SE, 2A3 SE Copper/Silver AN Ultra HiB 2,611.20
TRANS-300/02-B T300-2-50-H306-SPA-F 300B SE, 2A3 SE Copper/Silver AN-Perma 50% Nickel 0.08mm 3,706.80
TRANS-300/02-D T300-2-55-SPA-SPA-S 300B SE, 2A3 SE Copper/Silver AN Super Perma 55% Nickel 0.08mm 6,540.00
TRANS-300/03-A T300-3-U-SPESPE-S 300B SE, 2A3 SE Audio Note™ Silver AN Ultra HiB 4,561.20
TRANS-300/03-B T300-3-50-SPXSPX-S 300B SE, 2A3 SE Audio Note™ Silver AN-Perma 50% Nickel 0.08mm 5,947.20
TRANS-300/03-D T300-3-55-H306H306-F 300B SE, 2A3 SE Audio Note™ Silver AN Super Perma 55% Nickel 0.08mm 9,695.00


Standard versions with steel frames, copper frames are available at additional cost, see introduction.

Picture shows Audio Note™ I-E Core version of TRANS-011 (TXP-011) and C-Core version TRANS-300 (TXO-300*)

Parallel Single-Ended 300B output Transformers.

Group C, bifilar wound double C-core output transformer with 1K25 primary impedance and 4 & 8 Ohm secondaries for 300B or 2A3 in parallel single-ended operation, 180mA standing current, 50 watt, , Size 115 mm x 102 mm x 136 mm, mounting holes centre to centre 87 mm to 84 mm both sides. Price is for ONE transformer!

Order Code NEW ORDER CODE Recommended Valve Wiring Primary - Secondary Core Material Price Excl. UK Vat
TRANS-305/IE T305-1-IE-H306H306-F 300B or 2A3 PSE Copper/Copper M4 I-E Core 375.00
TRANS-305 T305-1-I-H306H306-F 300B or 2A3 PSE Copper/Copper AN Improved HiB 644.00
TRANS-305/01 T305-1-S-H306H306-F 300B or 2A3 PSE Copper/Copper AN Super HiB 854.00
TRANS-305/01-A T305-1-U-H306H306-F 300B or 2A3 PSE Copper/Copper AN Ultra HiB 1,162.00
TRANS-305/02 T305-2-S-H306-SPA-F 300B or 2A3 PSE Copper/AN-Silver AN Super HiB 1,881.60
TRANS-305/02-A T305-2-U-H306-SPA-F 300B or 2A3 PSE Copper/AN-Silver AN Ultra HiB 2,611.20
TRANS-305/02-B T305-2-50-H306-SP-F 300B or 2A3 PSE Copper/AN-Silver AN-Perma 50% Nickel 0.08mm 3,706.80
TRANS-305/02-D T305-2-55-SPA-SPA-S 300B or 2A3 PSE Copper/AN-Silver AN Super Perma 55% Nickel 0.08mm 6,540.00
TRANS-305/03-A T305-3-U-SPESPE-S 300B or 2A3 PSE Audio Note™ Silver AN Ultra HiB 4,561.20
TRANS-305/03-B T305-3-50-SPXSPX-S 300B or 2A3 PSE Audio Note™ Silver  AN-Perma 50% Nickel 0.08mm 5,947.20
TRANS-305/03-D T305-3-55-H306H306-S 300B or 2A3 PSE Audio Note™ Silver AN Super Perma 55% Nickel 0.08mm 9,695.00


TRANS-305/IE (TXO-305-1-IE-H306-H306-FC) standard steel frames and TRANS-310/02-C in optional full copper shroud

Single Ended 211, VT4-C & 845 Output Transformers

Group C, bifilar wound double C-core output transformer with 10K primary impedance and 4 & 8 Ohm secondaries for 211/VT4-C or 845 in single-ended operation, 240mA standing current, 50 watt, flash tested to 5,000 volts, Size 115 mm x 102 mm x 136 mm, mounting holes centre to centre 87 mm to 84 mm both sides. Prices are for ONE transformer.

Order Code NEW ORDER CODE Recommended Valve Wiring Primary - Secondary Core Material Price Excl. UK Vat
TRANS-310/IE T310-1-IE-H406H406-F VT4-C/211 or 845 SE Copper/Copper M4 I-E Core 375.00
TRANS-310 T310-1-I-H406H406-F VT4-C/211 or 845 SE Copper/Copper AN Improved HiB 644.00
TRANS-310/01 T310-1-S-H406H406-F VT4-C/211 or 845 SE Copper/Copper AN Super HiB 854.00
TRANS-310/01-A T310-1-U-H406-ICPT-F VT4-C/211 or 845 SE Copper/Copper AN Ultra HiB 1,162.00
TRANS-310/02 T310-2-S-H406-SPA-F VT4-C/211 or 845 SE Copper/AN-Silver AN Super HiB 1,881.60
TRANS-310/02-A T310-2-U-H406-SPA-F VT4-C/211 or 845 SE Copper/AN-Silver AN Ultra HiB 2,611.20
TRANS-310/02-B T310-2-50-H406-SPA-F VT4-C/211 or 845 SE Copper/AN-Silver AN-Perma 50% Nickel 0.08mm 3,706.80
TRANS-310/02-D T310-2-55-SPA-SPA-F VT4-C/211 or 845 SE Copper/AN-Silver AN Super Perma 55% Nickel 0.08mm 6,540.00
TRANS-310/03-A T310-3-U-SPE-SPE-F VT4-C/211 or 845 SE Audio Note™ Silver AN Ultra HiB 4,561.20
TRANS-310/03-B T310-3-50-SPXSPX-F VT4-C/211 or 845 SE Audio Note™ Silver AN-Perma 50% Nickel 0.08mm 5,947.20
TRANS-310/03-D T310-3-55-SPXSPX-F VT4-C/211 or 845 SE Audio Note™ Silver AN Super Perma 55%  Nickel 0.08mm 9,695.00

Up to now the recommendation has been that all Audio Note™ silver wired bobbins should only be used with Nickel C-cores as the performance improvement is tremendous, however, with the emergence of the new AN Ultra HiB the sands have shifted, so whilst in general it is still my view that the nickel cores are the best sonic investment one can make, the Ultra HiB has changed the position to the point where the Nickel is really only a good investment, if there is silver in one or both windings, the AN Ultra HiB should be considered as it provides a slightly gentler character with a better/deeper bass character than the nickel irons, bear this in mind when you plan your project.

Believe it or not, I have tried to keep the prices of the above transformers as low as possible, and I would like to remind all of you reading this, that when you consider the fact that a Japanese made ONGAKU™ output transformer would cost at least 3 times as much as the best version of one of the new Audio Note™ silver wired 211SE output we offer above, and that in addition to this our output transformer has not only a better C-core and general specification than the original ONGAKU output transformer, so whilst these prices may seem expensive, the product offered is incomparable to anything on the market both in terms of both sonic and technical quality.

The Audio Note™ output transformers offered above differ from the ones used in production amplifiers in two key areas,

1. Output transformers in such amplifiers as the ONGAKU™, KEGON™ or BARANSU are carefully matched to three different parameters (I am not at liberty to tell you more than one, frequency response, the other parameters are proprietary, as I do not want our competition stealing more of our technology and ideas than strictly necessary).

2. We use the C-cores with the best/neatest lamination alignment in production, and whilst this makes little difference to the sound, it is important to appreciate this fact.

All the above transformers are supplied raw in the sense that they are unpotted and with flying leads.

We shall shortly be adding a range of parallel single-ended 211/845 output transformers, so keep a look out for them.

As a rule delivery of the above output transformers is from stock, but dependent on internal usage delivery time can occasionally occur, especially the new custom made AN Perma Nickel cores may be on very long delivery, which can be as long as 16 – 18 weeks, we will normally try to tell you if a transformer is not in stock how long the delivery is likely to be, but in the case of the permeable materials production processes are very complex and problematic, so just beware.

Peter Qvortrup | 1st December 2006

All material copyright Audio Note (UK) Ltd., unless otherwise stated