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300B SE OPT & Choke choice

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Thanks justmikey, missed your post but that’s what I ended up doing.

The ISO are installed and working nicely.
I ran a square wave and FR measurement in ARTA.

Different circuits but comparing to this shootout,
http://www.tubesoundelectronics.de/tabellen/messtabelle_ot_etf2009.pdf
Looks like the ISO are very good to excellent performers?

Can someone explain how to evaluate the HF resonance and overshoot as was done in the shootout?
 

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When I bought them directly from ISO the cost was:
FC-20S output transformers -- $473/pr
LC-10-200DII choke -- $137/ea
$85 FedEx shipping to US from Japan.

I think they had a price increase since then, but at the same time there is now a US distributor so could influence prices and availability.
 
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