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. > > > > *From:* BVARC <bvarc-boun...@bvarc.org> *On Behalf Of *rodney martinez > via BVARC > *Sent:* Saturday, February 17, 2024 12:39 PM > *To:* BRAZOS VALLEY AMATEUR RADIO CLUB <bvarc@bvarc.org> > *Cc:* rodney martinez <sota...@yahoo.com> > *Subject:* Re: [BVARC] Tube testing > > > > I have a tube tester. You can bring them by my shop any day next week. > > 832-423-5640 > > 73' > > Rod Martinez > > NK5Q > > Sent from Yahoo Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > > > > On Sat, Feb 17, 2024 at 11:55, Andre Pollard via BVARC > > <bvarc@bvarc.org> wrote: > > 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 > > > > BVARC mailing list > > BVARC@bvarc.org > > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > > Publicly available archives are available here: > https://www.mail-archive.com/bvarc@bvarc.org/ > > ________________________________________________ > Brazos Valley Amateur Radio Club > > BVARC mailing list > BVARC@bvarc.org > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Publicly available archives are available here: > https://www.mail-archive.com/bvarc@bvarc.org/ >
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