Re: Vacume tube TC

In a message dated 96-12-12 02:43:35 EST, you write:

 I just use any kind of transformer in place of a filament transformer as
 as voltage and current is correct.  A  dropping resistor can be used in
 series with the transformer input to reduce the output voltage if needed, or
 use a variac.  If transformer is overrated in current--that's OK.  Two or
 more transformers can be placed in series or parallel to give the needed
 voltage and current, but be sure to observe proper phasing.   These
 techniques are useful when you just don't  want to wait for the exact spec

Old transformers out of the old tube type television sets work good for this.
 They had massive filament windings.  You can also strip off all the
secondary windings off and wind some new ones for heavy current.  I did this
to build a low voltage, brute force DC supply.

Ed Sonderman