Haven’t noticed any. It is a simple device, a quad op-amp and four pots in a 
little metal box. It runs off 12 V, so it can plug into the shack supply.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jan 16, 2019, at 8:14 AM, K9MA <k...@sdellington.us> wrote:
> 
> On 1/16/2019 10:00, Walter Underwood wrote:
>> When I need to drive two sets of headphones, I use a $25 Behringer HA400 
>> headphone distribution amp.
>> 
>> https://www.amazon.com/Behringer-HA400-Ultra-Compact-4-Channel-Headphone/dp/B000KIPT30
> 
> Any trouble with RFI?
> 
> 73,
> 
> Scott K9MA
> 
> -- 
> Scott  K9MA
> 
> k...@sdellington.us
> 
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