testing 6550's on a Hickok 539b, same as KT88?

famousmockingbird · 21st February 2011, 05:29 PM

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

HollowState · 21st February 2011, 06:37 PM

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.

famousmockingbird · 21st February 2011, 06:45 PM

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!

21st February 2011, 05:29 PM	#1
famousmockingbird diyAudio Member Join Date: Dec 2010 Location: Amesbury, MA	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

21st February 2011, 06:37 PM	#2
HollowState diyAudio Member 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. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

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21st February 2011, 06:45 PM	#3
famousmockingbird diyAudio Member Join Date: Dec 2010 Location: Amesbury, MA	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!