New construction Mk III built from parts-bin stuff and new Triode-El transformers. Amp went together easily. Surprised at the simplicity of this amp. Plugged it in and got a case of run-away bias. Checked polarity of diodes and electrolytics. Measured resistor and cap values. Everything checks out. Rechecked all connections re schematic and everything seems to be correct. When bias was measured, I pulled the plug as soon as voltage got over 2 v. Bias pot is not able to control the high voltage. Any suggeations greatly appreciated. Thanks!
PS - tried 2 new rectifier tubes and 2 sets of KT 88s. Same behavior with all tubes.