Hey guys I have a Orange AD30TC Combo that runs a quad of El84's. I'm needing a tube change here, starting to get micro-phonic. I have read that many people's AD30's like Vox AC30's run their El84's Hot and Hard...mmmm...to get that great classic British crunchberries. I know that these amp "eat" these tubes when ran cranked as they should be. I have read that the 7189 (NOT 7189A's) have all the same specs except the max plate voltage is 400 instead of the El's 300. I know the all around quality is supposed to be beefier too. Wondering if any one has substituted these and what it did? I know a lot of times the "premium" tubes that have less distortion used in Hifi are horrible for Guitar Amplifier use. I'm just trying to extend the life. I'm looking to stay under $100 for the quad so the NOS El84's are pretty much out. Thanks guys.