I'm rebuilding a JCM 800 2204 and need a new OT! I'm looking at this heyboer: http://www.thevintagesound.com/store/marshall-style-jcm800-plexi-50w-output-transformer-p-49.html Any good? I'd rather not spring for a $260 mercury, and recently I saw a video where John Suhr said he preferred the heyboer over the mercury. I'm not sure if this particular transformer would apply to his evaluation, or if it's just the ones he has custom wound. I'm open to some ideas! Thanks!