Put the Rowland up for sale and find a Lamm amp somewhere. Trust me--the Rowland is muy bueno, but the latest Lamms are c'est fai't accompli!! .......Jean
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I used to have Rowland Model 7 MK3 and 8Ti and knew exactly what you were talking about. Both have identical problems as you described. I believe the hum was induced by those huge transformers. The only thing that has any effect is the reverse the polarity of the power chord. (I simply pull off the ground prones and reverse plug.) However, it merely reduced the level but never completely eliminated the hum. Like you described, I couldn't reproduce the hum consistently and never quite figured out what the cause was. It seemed independent of the temperature nor volume level. Although the hum shouldn't be audible from the listening to ruin the joy, it nevertheless bothered me since at that price level, I should expect nothing but perfection. I've long gone back to tubes and being suffering from different types problems. Good luck.
i've had a jrdg model 8 amp for the past nine years. it's been upgraded to the "ti" version but not to the "tihc." when i first bought my amp, i experienced the same sort of hum problem you describe. jeff fixed it by installing the sort of top plate that is now standard and performing some other magic whose particulars i can't now recall. thereafter the hum disappeared. when i did some remodeling of my sound room this past summer, i unplugged my amp for a couple of days to get it out of the way. ( it hasn't been unplugged for that long for maybe 5 or 6 years.) when i plugged it in again, i thought i'd returned to the bad ol' days; the hum was the worst i'd ever heard. it went away, though, in about 30-45 minutes. i beleive the most recently-experienced hum problem was caused by the caps being brought up to full charge, which adversely affected the transformer/chokes, from which the hum was quite obviously emanating. anyway, i've found that i have no hum at all if i leave the amp powered up all the time. the only negative aspect to this is that the bulbs on the power switch burn out; i've got plenty of extras, tho, and they're real easy to change once you learn how. i'd suggest leaving your amp in the fully-powered mode for a few days and see if your hum disappears. if it does, then you know the cause and can deal with it in the way that best meets your needs. if it doesn't, then something else is wrong. no amp at the price point of the jrdg 8 should hum audibally. if your problem persists, ask to speak to jeff personally. he's a very nice guy and truly cares about his customers. good hunting. _kelly