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Details about  Push pull single end Audio output transformer core kit1

Push pull single end Audio output transformer core kit1 See original listing
Item Ended
Item condition:
--not specified
18 Jun, 2013 20:18:03 AEST
US $32.00
Approximately AU $34.26
US $30.00 (approx. AU $32.11) USPS Priority Mail International | See details
Item location:
Hong Kong, Hong Kong


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  26 Oct, 2012 20:46:54 AEDST  View all revisions

Push pull single end Audio output transformer core kit


You are bidding a high quality Double C core (CORE-25 x 2 set), audio output transformer building kits.


This is the auction for CORE-25, please check below for CORE-25 Size specification


This auction provide 2 set of core kits enough for building 2 transformer core material ( excluded magnet wire and insulation).


Hi Fi enthusiastic often found the output transformer post the limitation of their next best amplifier design, Finding a high grade vintage output transformer can cost sky high and matter of luck. This core kit is design for advance DIYer to build the output transformer with confidence of their design.


The cut core allow you easy to set the transformer air-gap arrangement, as well as fine tune the air gap distance. If you are building push pull amplifier, just stack the upper and lower core together with the supplied stainless belt without any gap.


The double C core arrangement had 2 winding envelop allow you to wind wide range of

wire arrangement, you can extended the bass by increase the primary inductance, or bi-winding, layer interleave winding, etc. The limited is only on your design.


It’s a special order of this Japanese silicon steel core material that design not for 60Hz but 400Hz (Equal or better then M6) together with the stunning ultra thin 0.23mm lamination thickness. It’s the best in class silicon steel core type material you can get for audio transformer building.


The kits comes with 2 core set material for you to build 2 output transformer, it included the core, winding bobbin, stand and the secure belt.


There is more then a book to describe how to build a output transformer, this auction or seller is not intended to guide you step by step in this, this auction just sell you high quality core so you have material that enable you to next step, you must know what you are doing, it’s advance topic in audio DIY.



High power Double C Cut core x 4 C core

Aluminum cast stand x 2, 1 per transformer

Stainless steel mounting belt x 4 each

Kelvin fiber tube winding bobbin x 4, 2 for each transformer



Material: 400Hz Z11 (m6) silicon steel lamination

Thickness: 0.23 mm

Mounting: Up-right mounting.



Core 25

Core 32

Core 40


Buy it now price

29.5 / pair

56.5 / pair

115 /pair

Physical core outer dimension:

3.375” x1.75” x 0.95”

86.5 x 45.5 x24.5mm

3.89”x 2.25”x 1.27”

98 x 57 x 32.5mm

5.7” x 2.85” x 1.6”

144 x 73 x 40.5mm

Window size:

2.45” x 0.8125”

61.5 x 20.5mm

2.64” x 1”

67 x 25.4mm

4” x 1.25”

104 x 31.5 mm

Weight ( core material only, each):




Bobbin Size ( each)

2.3” x1.1” x 0.6”

59 x 28 x 16mm

2.49” x 1.4” x 0.8”

63 x 36 x 20.5mm

3.87” x 1.73” x 0.95”

98.5 x 44 x 24.3 mm

Mounting hole

2” x 1.65”

50 x 42mm

2.56 x 1.75”

65 x 45mm

3.2” x 2.36”

81 x 60 mm

 the 50Hz power of kit 1 is 60W, kits2 is 100W, kits3 is 200W, kits 4 is 300W

Enjoy our super fast shipping, with this special Fedex rate, which will get your product to your door usually less then 3 day by Fedex.


Store Policy:


By placing your bid, you are agree to follow our store policy below:

All purchased are final, will replace defective product only.

Return package must be in the original packaging, everything must be in new condition. Missing part’s or anything in original contact will not qualify for any refund.

Unless marked in the auction, all product follow our 1 month warranty policy.

Defective item can be exchanged within 14 days of receipt.

Within warranty period, all exchanges due to defects are free (Buyer is responsible for shipping charges). 

Shipping and handling fees are NOT refundable in any case.

Custom duty is responsible by buyer.

Replacement and refunds will not be processed until the return item received.

Customer is responsible for correct address and received of package. Customer is responsible to all shipping if return package due to customer unable to received the package.

Please do not ask us to reduce the price and shipping and handling fee of the item after you have won the auction.

We are not responsible for wrong or undeliverable address, customer responsible undeliverable Fedex package return fee and re shipping fee.


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