Date: Thu, 9 May 2019 15:47:49 +0100
From: Chris Wilson <dead.fets@gmail.com>
Message-ID: <1562754668.20190509154749@gmail.com>
To: DK7FC <rsgb_lf_group@blacksheep.org>
In-Reply-To: <5CD42C82.80906@posteo.de>
References: <477297345.20190414143742@gmail.com> <5CB35457.9060303@posteo.de> <592014641.20190414170848@gmail.com> <5CB37097.90104@posteo.de> <853391954.20190509134230@gmail.com> <5CD42C82.80906@posteo.de>
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Subject: Re: LF: Another impedance matching question. Paul's audio amps.
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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
>>


-- 
Best regards,
 Chris                            mailto:dead.fets@gmail.com