Re: [BVARC] Tube testing

Sat, 17 Feb 2024 12:15:51 -0800

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 <[email protected]> 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 <[email protected]> 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 <[email protected]> On Behalf Of rodney martinez via BVARC
Sent: Saturday, February 17, 2024 12:39 PM
To: BRAZOS VALLEY AMATEUR RADIO CLUB <[email protected]>
Cc: rodney martinez <[email protected]>
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

 

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

 

BVARC mailing list

Publicly available archives are available here: https://www.mail-archive.com/[email protected]/

________________________________________________
Brazos Valley Amateur Radio Club

BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
Publicly available archives are available here: https://www.mail-archive.com/[email protected]/
________________________________________________
Brazos Valley Amateur Radio Club

BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
Publicly available archives are available here: https://www.mail-archive.com/[email protected]/ 
________________________________________________
Brazos Valley Amateur Radio Club

BVARC mailing list
[email protected]
http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org
Publicly available archives are available here: 
https://www.mail-archive.com/[email protected]/

Reply via email to