Hi Dave
You may as well try it with your existing transformer first. All you are really after is a regulator to stop the rectified and smoothed supply from going over the 6 volts.
The rectified 6.7v when smoothed will be almost 9.5 volts, not quite enough for proper regulation but if it drops to 5.5 volts under load it shouldn't matter too much.
You can add a switch to select one of two resistors in the circuit, to change between 6 and 2 volts.
It will regulate OK at 2 volts.
Alternatively you can put the 2 secondaries in series, you will have enough spare volts for the regulator to do its job then.
I have just built something similar but lower power. see, http://www.vintage-radio.net/forum/showt...p?t=134336 and it should also provide the HT and SG supplies
Mike
You may as well try it with your existing transformer first. All you are really after is a regulator to stop the rectified and smoothed supply from going over the 6 volts.
The rectified 6.7v when smoothed will be almost 9.5 volts, not quite enough for proper regulation but if it drops to 5.5 volts under load it shouldn't matter too much.
You can add a switch to select one of two resistors in the circuit, to change between 6 and 2 volts.
It will regulate OK at 2 volts.
Alternatively you can put the 2 secondaries in series, you will have enough spare volts for the regulator to do its job then.
I have just built something similar but lower power. see, http://www.vintage-radio.net/forum/showt...p?t=134336 and it should also provide the HT and SG supplies
Mike
