[Drakelist] TR-4 Audio Hum Question

[Alan Adelman]

I have used the Hayseed kit and it is very simple to install.  You will 
need a high wattage soldering gun or other comparable device (not just a 
small pencil-type iron) for one one of the can caps.  As somebody else 
mentioned, you should test the PS using a voltmeter before you attach it 
to your TR4.  Especially make sure the bias voltage is correct.  While I 
was in there, I also replaced all of the resistors with modern types; it 
only costs a few dollars in parts and 30 min of labor.  You then know 
that your PS is in good shape all-around.

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