I have to re-tube a Traynor ygm3 guitar mate reverb , the original tubes are still fine (mullard) so i'll put those away to sell with the amp at some future point . i'm leaning towards the EH tubes as they are a reissue/copy of the mullard el-84 and the traynor is very vox /marshall like in circuitry .. but have heard great things about the reliability of jj tubes regarding heat dissapation . Thanks lads ..