Replacing a bad cathode bypass capacitor with a fresh one will increase hum
because the low freq gain will be improved along with better bass response.
But you shouldn't have hum in the speaker anyway (only some residual hum in
headphones at low volume) if the audio stage and B+ feed is operating
c
How much hum and via what output? If I use "hi-fi" headphones on my tube
gear, I can hear hum. OTOH it is not really noticeable with the speaker.
73,
Ron WD8SBB
--- On Wed, 7/8/09, Tom NØJMY wrote:
From: Tom NØJMY
Subject: [Drakelist] Need some R-4A help:
To: "Drakelist&qu
Tom,
Does he have a spare audio output tube he can sub in to make sure the tube
itself is not causing the hum?? I would try that first, then look at
coupling capacitors that he hasn't yet changed.
73,
Don, WB5HAK
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Drakel
I am trying to help another Drake fan, but need some of you fellows
experteeism:
He has hum in his early R-4A including with the AF gain turned to
minimum. He replaced the can-cap in it (this one is the 3-section
version, all 100 mfd) and the hum "dropped dramatically".
Apparently there was
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