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In Reply to: RE: My B&K 707 sensitivity seems wonky posted by tonyptony on August 20, 2010 at 19:13:53
When my B&K 700 needle was wonky during the sensitivity calibration, it turned out to be capacitors. I just replaced them all as there aren't that many.
As yours has recently been rebuilt, you might first try cleaning all the control and switch contacts. It might be as simple as that.(Make sure unit turned off and capacitors have had time to discharge!)
I used a zero residue contact cleaner on mine. (Of course debates run wild on which cleaners best.)
Also clean your tube pins, sockets.
Don't forget to check for any loose wires and cold solder joints.
I am not a technician, but forum folks helped me with mine. You may want to search threads of mine. Also "Big Harry" threads. Either with B & K tube testers. He was a great help.
Also, I eventually bought spare tubes for the tester. Good to get them when it is working well and you can actually test them! Sometimes it is a tube that needs replacing in the tester. (Otherwise, my goodness, we may have to buy another tester to check our tubes in our tube tester!)
Sorry couldn't be more specific. Maybe someone else can chime in?
Cheers!
Jonesy,
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
Also clean the contacts on the two bulbs (#55) in the grid signal circuit - I have heard some recommend SOLDERING these into the circuit.
Well, I cleaned the #55 bulbs and sockets and also did a SS replaceent for the #83. That, and liberal cleaning of the switch contacts, and a recalibration and things seem a lot better. And it's nice the tester no longer heats up like a frying pan with the #83 cooking away.
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