Agreed, my experience as well from old tube TVs. Just want to make sure none are shorted before throwing the HV to it. Trying to limit smoke generation On Feb 17, 2024, at 1:40 PM, John Mechura via BVARC <bvarc@bvarc.org> wrote:
Absolutely, John P., if the checker says it is good, well, maybe. If it says it is bad, as in shorted on the checker then believe it.
However it is quite possible for a "weak" tube to still do yeoman's duty depending on the circuit.
There was a time when I was fixing TVs that when it was required to align the IF stages, after connecting the sweep gear, just simply trying different tubes in the three IF amplifier stages might bring you closer to final alignment. This was when tubes were plentiful, though. Oh, by the way, the IF bandpass was 6Mhz wide with an "M-derived" trap at 41.25 Mhz.
OK, sorry to bore with stories of "glory days" but y'all are the only audience that I can share stories like this with.
73 John, KI5HOC On Sat, Feb 17, 2024 at 1:04 PM John Parmalee via BVARC < bvarc@bvarc.org> wrote: I think your best test is to put them in the rig and fire it up watching the output, the drive and maybe reading grid voltage stage to stage. I have a tube tester. You can bring them by my shop any day next week. NK5Q On Sat, Feb 17, 2024 at 11:55, Andre Pollard via BVARC I am currently restoring my old Heathkit HW-100. It was working the last use, around 1980 or so. Checking out resistors and changing electrolytics. I want to check the tubes. Anyone know if a vendor at the Hamfest can check them? Or know someone else that can? ________________________________________________ Brazos Valley Amateur Radio Club
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