by EWBrown » Tue Apr 29, 2008 9:00 am
The 3.5 / 2.5K James OPTs (6112HS) also work fine with the GSG. I originally built mine with 5K / 3.5K, found I liked the 3.5K sound and replaced them with the 6112s, then I used the 5K (6113HS) OPTs in a very nice sounding 13EM7 SET amp.
I haven't yet tried 2.5K with the 6B4Gs, to see how that would sound. 2.5K is the "old school" recommended 2A3 / 6B4G primary impedance, along with 300VDC B+, but then the new manufactured 6B4Gs and 2A3s are quite a bit "tougher" than the vintage ones.
IIRC, the 6115HS has been replaced with the 6113HS, but since neither one shows up on the website, they must be out of stock of the 5K / 3.5K primary OPTs. The 6112HS are listed as in stock and ready to ship, but it always pays to contact Keith first - the website hasn't been updated since November 2007.
Euphonia's "on hand" stock situation can be quite "variable" at times...
/ed B in NH
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