testing 6550's on a Hickok 539b, same as KT88? - diyAudio
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Old 21st February 2011, 05:29 PM   #1
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Join Date: Dec 2010
Location: Nottingham, NH
Default testing 6550's on a Hickok 539b, same as KT88?

I tested some 6550's with the KT88 switch settings because I could not find 6550 on the roll chart. I noticed when I pushed P4 that my digital plate current meter was throwing out some really bizarre readings. I do not think they are the same switch settings so if anyone has a 539b or 539c and can find the switch settings for a 6550 please let me know.

Thanks in advance
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Old 21st February 2011, 06:37 PM   #2
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Join Date: Aug 2006
Location: Taxland, New Jersey
Even the latest (last) data chart (#3200-330) for the 539C does not list a 6550. I have always used the KT88 settings, in the foreign data supplment, with no problems and am confident they are correct. If you are experiencing trouble, I'd suggest a bad tube or bad connection somewhere.
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Old 21st February 2011, 06:45 PM   #3
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Location: Nottingham, NH
Thanks Hollow state! I think the tubes are faulty, I have always used KT88 switch settings before without problems. Just wanted a second opinion.

Thanks again!
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