Audio Note Output Transformers - Parts ConneXion

Old 

Order NEW ORDER CODE 

Code 

Audio Note Output Transformers 

Group A Single-ended Outputs. 

Max Primary/ 

Recommended 

Cl. A Secondary Size 

Valves 

Power Impedances 

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Shipping Address: 5109 Harvester Rd, Unit B2 • Burlington • Ontario • Canada • L7L 5Y4 

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Max. 

Current 

Order 

Code 

TRANS- 

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

144 

TRANS- 

152 

TRANS- 

180 

Recommended 

Valves 

300B/2A3/6B4G 

Group B, Single-Ended Outputs 

Max Cl. A 

Primary - 

Power 

Secondary 

Impedances 

25 w 

2K5 - 4/8 Ohms 

75 w 

211/VT4C or 845 5K - 4/8 Ohms 

Size 

117x98x90 

137x115x145 

mm 

Maximum 

Current 

90 mA SE 

240 mA PSE 

Group B, Push Pull 

TRANS-200 EL84/ECL86/6V6 15 w 8K - 4/8 Ohms 80 x 67 x 68 mm PP 

TRANS-185 EL34/6L6G/5881 25 w 6K - 4/8 Ohms 88 x 73 x 80 mm PP 

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mm

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 

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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! 

NEW 

Old Order 

Wiring Primary - 

ORDER Recommended Valve 

Code 

Secondary 

CODE 

Core Material 

TRANS-300/ TXO-300-1-IE- 

IE 

H306-H306-FC 

300B SE, 2A3 SE Copper/Copper M4 I-E Core 

TRANS-300 

TXO-300-1-I- 

H306-H306-FC 

300B SE, 2A3 SE Copper/Copper AN Improved HiB 

TRANS- TXO-300-1-S- 

300/01 H306-H306-FC 

300B SE, 2A3 SE Copper/Copper AN Super HiB 

TRANS- TXO-300-1-U- 

300/01-A H306-H306-FC 

300B SE, 2A3 SE Copper/Copper AN Ultra HiB 


300/02 H306-SPA-FC 

300B SE, 2A3 SE Copper/Silver AN Super HiB 


300/02-A H306-SPA-FC 

300B SE, 2A3 SE Copper/Silver AN Ultra HiB 

TRANS- TXO-300-2-50- 

AN-Perma 50% 

300B SE, 2A3 SE 

Copper/Silver 

300/02-B H306-SPA-FC 

Nickel 0.08mm 

AN Super Perma 

TRANS- TXO-300-2-55- 

300B SE, 2A3 SE 

Copper/Silver 55% Nickel 

300/02-D SPA-SPA-SC 

0.08mm 


300/03-A SPE-SPE-SC 

300B SE, 2A3 SE Audio Note Silver AN Ultra HiB 

TRANS- TXO-300-3-50- 

AN-Perma 50% 

300B SE, 2A3 SE 

Audio Note Silver 

300/03-B SPX-SPX-SC 

Nickel 0.08mm 


TRANS- TXO-300-3-55- 

300B SE, 2A3 SE 

Audio Note Silver 55% Nickel 

300/03-D H306-H306-FC 

0.08mm 





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

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! 

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

300*) 

NEW 

Order 


ORDER Recommended Valve Core Material 

Code 

Secondary 

CODE 

TRANS-305/ TXO-305-1-IE- 

300B or 2A3 PSE Copper/Copper M4 I-E Core 

IE 

H306-H306-FC 

TXO-305-1-I- 

TRANS-305 300B or 2A3 PSE Copper/Copper AN Improved HiB 

H306-H306-FC 


300B or 2A3 PSE Copper/Copper AN Super HiB 

305/01 H306-H306-FC 





TXO-305-1-U- 

H306-H306- 

FC 

300B or 2A3 PSE Copper/Copper AN Ultra HiB 

TXO-305-2-S- 

300B or 2A3 PSE 

H306-SPA-FC 

Copper/AN-Silver AN Super HiB 

TXO-305-2-U- 


H306-SPA-FC 

Copper/AN-Silver AN Ultra HiB 

TXO-305-2- 

AN-Perma 50% 

50-H306-SP- 300B or 2A3 PSE 

Copper/AN-Silver 

Nickel 0.08mm 

FC 

TXO-305-2- 


55-SPA-SPA- 300B or 2A3 PSE 

Copper/AN-Silver 55% Nickel 

SC 

0.08mm 

TXO-305-3-U- 


SPE-SPE-SC 

Audio Note Silver AN Ultra HiB 

TXO-305-3- 

AN-Perma 50% 

50-SPX-SPX- 300B or 2A3 PSE 

Audio Note Silver 

Nickel 0.08mm 

SC 

TXO-305-3- 


55-H306- 300B or 2A3 PSE 

Audio Note Silver 55% Nickel 

H306-SC 

0.08mm 

TRANS- 

305/02 

TRANS- 

305/02-A 

TRANS- 

305/02-B 

TRANS- 

305/02-D 

TRANS- 

305/03-A 

TRANS- 

305/03-B 

TRANS- 

305/03-D 

TRANS- 

305/01-A 

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 

TRANS-310/ 

IE 

TRANS-310 

NEW 


ORDER Recommended Valve 

Secondary 

CODE 

Core Material 

TXO-310-1-IE- 

H406-H406-FC 

VT4-C/211 or 845 SE Copper/Copper M4 I-E Core 

TXO-310-1-I- 

H406-H406- VT4-C/211 or 845 SE Copper/Copper AN Improved HiB 

FC 

TXO-310-1-S- 

H406-H406- VT4-C/211 or 845 SE Copper/Copper AN Super HiB 

FC 

TXO-310-1-U- 

H406-ICPT- VT4-C/211 or 845 SE Copper/Copper AN Ultra HiB 

FC 

TXO-310-2-S- 

VT4-C/211 or 845 SE 

H406-SPA-FC 

Copper/AN-Silver AN Super HiB 

TXO-310-2-U- 

VT4-C/211 or 845 SE 

H406-SPA-FC 

Copper/AN-Silver AN Ultra HiB 

TXO-310-2- 

AN-Perma 50% 

50-H406-SPA- VT4-C/211 or 845 SE Copper/AN-Silver 

Nickel 0.08mm 

FC 

TXO-310-2- 


55-SPA-SPA- VT4-C/211 or 845 SE Copper/AN-Silver 55% Nickel 

FC 

0.08mm 

TXO-310-3-U- 

VT4-C/211 or 845 SE 

SPE-SPE-FC 

Audio Note Silver AN Ultra HiB 

TXO-310-3- 

AN-Perma 50% 

50-SPX-SPX- VT4-C/211 or 845 SE Audio Note Silver 

Nickel 0.08mm 

FC 

TXO-310-3- 


55-SPX-SPX- VT4-C/211 or 845 SE Audio Note Silver 55% Nickel 

FC 

0.08mm 

TRANS- 

310/01 

TRANS- 

310/01-A 

TRANS- 

310/02 

TRANS- 

310/02-A 

TRANS- 

310/02-B 

TRANS- 

310/02-D 

TRANS- 

310/03-A 

TRANS- 

310/03-B 

TRANS- 

310/03-D 

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.

Audio Note Output Transformers - Parts ConneXion

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