So I did some measuring inside my tweed deluxe clone today, and I'm wondering if I should be concerned about anything. It has a Hammond 290bex transformer with a 240V primary. Wall voltage here is actually 230V, so the heater voltages are a bit low: 4.5V (instead of 5V) on the 5y3, and 5.8 (instead of 6.2V) on the others. Is this an issue? Next, I checked the bias: plate current is about 37.7mA per tube (calculated by deviding bias resistor R by voltage drop across the resistor, then deviding that by 2). Multiply this by the 351V plate voltage and I get an average plate dissipation of 13.2W per tube. Looking at the specs of my Tung Sol tubes, it would seem they're over biased. (http://www.tungsol.com/specs/6v6gt-tung-sol.pdf) The specs call for max 12W dissipation, max 35mA, and max 315V plate voltage. Am I still in the green, or should I change something? Thanks!