[RFI] K-Com vs. Bytemark/Amidon Phone Filters?

[wd3q@starpower.net]

At the Hamvention this past weekend, the Bytemark/Amidon guys were there with their phone filters.  

The are physicallyt larger than the K-COM filters, but there was no technical information available, other than that theie units were for specific 'services', implying that they use type 73 ferrites (vs 43 they claim K-COM uses) for the ham bands.

Can anyone verify the performance difference, if any, between these manufacturers? 

Thanks in advance, 

Eric W3DQ
Washington,