VTTC first sound :-)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Herwig Roscher by way of Terry Fritz <twftesla-at-uswest-dot-net>" <herwig.roscher-at-gmx.de>


Hi fellow VTTC builders,

Today I audiomodulated of my system for the first time. I used a 20 
W car amplifier/equalizer driven by a signal generator. A 12/230 V 
mains transformer was connected between grid coil and grid leak 
combination. No other modifications were necessary.

Connecting the scope across a 4-turn-pickup coil wound 3.5" below 
the primary, I easily could adjust the amplitude of the signal 
generator to a point, where the amplitude modulation was just 100 
%. Deafening noise forced me to use ear protection. Sweeping the 
modulation frequency I had to state, that the frequency response of 
the mains xformer (like suspected) was dissapointing. So I'm 
looking for an output tranny of a tube amplifier now. 

Still a lot of work to do, but a lot of fun as well.

Regards,

Herwig