The pair of output transformers 10K to 4 and 8ohm like GM70.GK71.845
I have made  them myself , having used my experience of making tube amplifiers and transformers for them.
The transformers are made on   M 090-23.   HiB(0.23mm) C-cores ,manufactured in Israel   The devices are winded frame less . It is a very neat kind of winding which does not allow any  inaccuracies.

The transformers are 40Watt power on 30Hz

The core air gap is chosen for DC current 120mA but may be changed .

The inductance is 52H

The primary coil resistance is 212ohm.

The transformers are checked in real tube amp . with GM70 (

The frequency responce of  the REAL amp. GM70 (100mA DC current, 1Watt )  is  8Hz- 34kHz  -3dB (the secondary coil is grounded ).

The insulation material is Mylar,which allows to make High Frequency Transformers!

Quality of insulation :  is more then 20Gohm   checked with a  megger 2500V ,during 1 minute  .

The weight of each device is   8.1Kg

I send parcels worldwide !   The shipping to USA is 320$.

 YOU SHOULD ask me about the price of shipping  ,before bidding...the worldwide shipping  depends on the country and  MAY BE LESS!!!