Please join us on the 5th Tuesday of August for a double-barrelled hands-on session:
Tube Testing
Joe W8KNO has kindly made available to the SIG his B&K 747 Dyna-Jet dynamic mutual conductance tube tester. This tester far exceeds the capabilities of your old drug-store tube checkers we may have used years ago.
So, if you have a project underway or awaiting the famed Round TUIT to get started, bring tubes and we will check their condition and performance. Please remember there is always the slim possibility that the testing process might kill your (thought it was good but it really wasn’t) Device Under Test so the risk is yours. Joe may be present or on Zoom to answer questions.
Toroid Identification
Based on Jim AC8NT’s February 2023 Radiogram article, we will go through the process of measuring known and unknown toroids. Jim will loan us his LCR meter for the session, as well as a drill jig for removing the coating on a toroid to get a reliable measurement.
So: bring that pile or bag of mystery toroid cores from your bench and junk box, and bring your LCR meter if you have one. We’ll step through the process that Jim outlines in his article. You may want to look at https://www.youtube.com/watch?v=Q95Vwk3kZok this YouTube video too, in advance of the session.
I look forward to seeing you there! 73 de Rick KD8WCK
