Floyd,
Just a thought....sometimes grounding both ends of a cable can cause
noise loops.....I pulled a lot of cable back in my youth (Ethernet
unshielded TP) but if we had to pull shielded we made sure to ground
at one end only.?
Tom Latimer
On 4/16/2024 19:58, Floyd - K8AC wrote:
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I installed a new piece of shielded cable, both ends grounded,
from the mic connector to the first mic audio stage and moved the
.001 cap to the tube end where the leads could be much shorter.?
Also found that the audio cable running to the mic level control
that didn't have that end grounded originally was, but with a poor
solder joint that broke at some point.? Fixed that and now the
noise level seems to be reduced.? But is still ugly around 40-45
dB down from the peak of a single 1 KHz tone.? No idea what a very
good HT-44 looks like in that respect - maybe I'm chasing my tail?
73, Floyd - K8AC
