Hi Chris,

Did you already lay out wires? And did you already get the amplifier?

73, Stefan

Am 09.05.2019 16:47, schrieb Chris Wilson:

Hello Stefan,

Thanks,  ordered 3, so get free shipping, it was cheaper than ordering
2 and paying shipping :)

Thursday, May 9, 2019, 2:34:58 PM, you wrote:

Hi Chris,

I would not recommend the one you selected because it has an unnecessary
large inner diameter and a  lower height, thus a lower AL value.

I think this is the same one that i recommended from Bürklin:
https://www.mouser.co.uk/ProductDetail/EPCOS-TDK/B64290A0699X830?qs=sGAEpiMZZMs2JV%252BnT%2FvX8Df1W1GtRs010YpcsJh6dvk%3D
It is also cheaper.
There are other materials available, such as T65, T38, T37, offering a
higher AL value. Maybe these are even more suitable at that sort of
frequency but i didn't spend too much time to select the best core for
each frequency. I use the N30 material from 1 kHz to MF at high power (

  >>  1 kW for one core) without problems. So this is what i recommend. It

will work.

73, Stefan

PS: If you want to bridge one of Paul's 2x 7.2 kW amps, you may need two
of them ;-)
PPS: You may want to build two orthogonal ground loops then, one per
channel. With SpecLab you can then drive each channel separately and so
you can build a software rotatable loop by aligning the phase between
the channels, while staying into the shack when its cold and/or rainy :-)

Am 09.05.2019 14:42, schrieb Chris Wilson:

Hello Stefan,

I  am  now on to building a matching transformer but it seems Buerklin
have  a  minimum  order  of  60 units! I have found this bigger core at
Mouser, could I use that instead please?

https://www.mouser.co.uk/ProductDetail/EPCOS-TDK/B64290L0730X830?qs=4l9S5vBWkUJtsO6ZFRCS4g%3D%3D