Looking for a smooth sounding 6922 variant

Hi folks.  I am currently auditioning some cables and am starting to suspect that a bit of higher-frequency harshness (fatigue, just a bit) might be due to something else in my system.  Could be anything, including the cables I'm auditioning.  I wanted to eliminate other causes, and so I'm looking for a pair of 6922' variants to put in my VAC Signature IIse to smooth out the higher frequencies a bit.  I think I've got telefunkens in there now.  Can I get some recommendations?  Perhaps Mullard makes a nice 6922.  Please answer with direct knowledge/experience.  Thanks.