Just an update to the issue with the Dyanco ST-70. Before I start, I just to thank Bob and ZX for your valuable inputs to the problem.
I did what Bob recommended and everything was normal. I then decided to go back to step one and disconnected all the Resistors and caps that I thought would be a factor to this problem. I then did check the continuity of the various pins on the tube holders to insure that there were no internal short between cathode and grid or plate. The resulting reading proved to be normal and then I removed one of the 1M voltage divider and found that the voltage had disappeared. I found the problem and the problem was that the R25 (1Meg) resistor laid over the 300 volt run. Over time, the 300 volts broke down the wire wound resistor and started arcing to the resistor. Thus, transferring the 300 volts to the grid circuit and to R17 which at the voltage value, it was generating close to 8 watts of power. No wonder the 1/2 watt resistor was turning to ashes. I removed the 1 Meg resistor and installed it on the bottom side of the PC board. Now there is ~ 30 volts on the grid and R17 has no heat issues.
May I make some recommendations to reduce this issue on other kits of this version that I am working on.
1. Mount R25 on the bottom side of the board and if you find that you need to mount the resistor on the top part of the board, use a carbon resistor, rather than a wire l wound resistor and put a spacer between the resistor body and pc board before soldering.
I had the power amp playing for a while before it the right channel dropped out. I will address that tomorrow.
The amp was warm and detailed and sounded pretty good for what I was using to drive it.
I was using an Infinity bookshelf and Luxman (TP-117?)preamp. For a media player I was using the Samsung Tab 7.
And thank you again for your help.