[DonaldStott]

First results with the replacement rectifier bridge - four UF4007 silicon diodes and a 150‎Ω series resistor:-

Input: 202V AC

Output: 235V DC

Success?? I'm already picking up a lot more stations on FM.

On FM the voltage drop across the series resistor is 10.8V and thanks to George Ohm we can calculate that the current is 0.072A (72mA). Multiplying the current times the voltage we get 0.072 x 10.8 = 0.77W.

On AM the voltage drop is 10.6V so the current is 0.070A (70mA). Multiplying the current times the voltage we get 0.070 x 10.6 = 0.74W.

These current values are almost spot on for this set and the wattages are well within the capabilities of the 3W 150‎Ω series resistor?

As a consequence the HT is up right across this set which seems to be performing much better - still a bit quiet on FM but this KB-MR10 is now out of Intensive Care.

Any critical valves/pins I need to check out - most values are up by 10-15% on what was measured previously.