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Well, problem solved.. Turns out the output transformers' secondary was wired in reverse. Once that was corrected there was no squeal - set the bias at approx. 19mA and it sounds AWESOME. Unfortunately there's a considerably harder problem to solve now and that is the hum - it still has a reasonable amount of hum (at power line freq's). Also, I managed to dribble solder down one of the legs of a 9-pine tube socket, which prevented the reverb 12AT7 from being inserted so I can't get reverb until thats changed...
Oh yeh, and on the tremolo.. I realised no footswitch = no tremolo :)
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