304TL Driver Test Setup
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Test Setup Detail 1
640.35 KB |
Test Setup Detail 2
674.84 KB |
Driver Test Setup 3
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Driver Feedback Network
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Here are a couple of still photos of the
modulator project. Thought
I’d try putting B+ on the 6L6 stage, and it works! The test was
somewhat unorthodox
meaning that I chose to “listen” to the sound quality by using a
output xfmr salvaged from an old Heathkit power amp connected to the
plates of
the 6L6’s with jumpers, then into a speaker. The gain on the preamp
from
the mic input is indeed insane. I’m glad I installed a line-level
input
jack as well, so I can use the console and audio processor chain. I
also noticed
that (probably due to the interstage xfmrs and feedback) it has a
relatively sweet passband , particularly for voice. Interesting. When
all is
done I will have a PDF schematic and wiring diagram for view also. Here’s a link to the video @ http://www.youtube.com/watch?v=7s58GMJ7LhA&feature=channel&list=UL 73’s for now, |