I was just troubleshooting my 1974 100 watt superlead as to why my Power transformer gets so hot. I mentioned this in a previous thread.... Anyway, as I was checking the bias under idol & playing conditions, I noticed that the bias rises as I turn the volume(s) up. At idol, with all controls to zero, by bias is set to ~ 36mA but when I plug a guitar in and play, as I turn the volume or both up, the bias goes up to over 200mA. Is this normal? The tubes do not red plate & the amp sounds fine. Is this a problem & why my tranny might be getting hot? I can't find anything else wrong with the amp. Thanks.