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Date: Sat, 11 May 2019 20:29:56 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
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> <1562754668.20190509154749@gmail.com>
In-Reply-To: <1562754668.20190509154749@gmail.com>
Subject: Re: LF: Another impedance matching question. Paul's audio amps.
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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
>>>
>>>        
>
>
>
>