[sdiy] Fire bottle ladder filter

[John L Marshall]

The 12U7 has a maximum plate voltage of 30 volts. These could get you back
to a comfortable B voltage.

Take care,
John


 >Anudda Update:
 >
 >After locating a better (larger) datasheet for the
 >12AU7A, I can see that each tride will need about 50V
 >across it to function. I'm surprised it worked at all
 >at 20V each.
 >
 >Looks like its time to get a load of heater
 >transformers.
 >
 >By the by: I have a schematic in PDF if anyone wants
 >it.
 >
 >--TR
 >