My we're a little question box this morning [Image: http://philcoradio.com/phorum/images/smi...on_lol.gif].
#1. It's shock mounted to help lesson microphonices
#2 Couldn't find a schematic w/ a parts list but best guess is that the 27's cathode has a fairly high resistance to ground. This controls the gain of the detector so the tube isn't conducting very much hence the gain or amplification is low. Less chance of hum pickup.
#3 It looks like the small cap is in parallel w/the tuning cap's 1st section so it would act as a fine tuning or peaking control for the 1st rf stage. The switch I'm not sure as it's not clearly defined on the schematic.
#4 The power transformer has a tap on the primary and this switch between the end of the winding or the tap. This is used to set the transformer's primary voltage vs your line voltage. If the switch is unmarked use an ohm meter across the the ac plug to determine the highest resistance of the two positions. This would be the setting for the higher line voltage.
Monday morning laff break: https://www.youtube.com/watch?v=_Q0AAvx8...M_2ZXWs55g
#1. It's shock mounted to help lesson microphonices
#2 Couldn't find a schematic w/ a parts list but best guess is that the 27's cathode has a fairly high resistance to ground. This controls the gain of the detector so the tube isn't conducting very much hence the gain or amplification is low. Less chance of hum pickup.
#3 It looks like the small cap is in parallel w/the tuning cap's 1st section so it would act as a fine tuning or peaking control for the 1st rf stage. The switch I'm not sure as it's not clearly defined on the schematic.
#4 The power transformer has a tap on the primary and this switch between the end of the winding or the tap. This is used to set the transformer's primary voltage vs your line voltage. If the switch is unmarked use an ohm meter across the the ac plug to determine the highest resistance of the two positions. This would be the setting for the higher line voltage.
Monday morning laff break: https://www.youtube.com/watch?v=_Q0AAvx8...M_2ZXWs55g
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
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