Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

new here !!
#15

Just because the tube lights up (i.e. the filament is working) doesn't mean it is working correctly, but its a start.  It won't work if the filament (which is sort of like the filament in an incandescent light bulb) is burned out.  You can check the filament by putting an ohm meter across the filament pins.  To find out which pins are the ones to check you look up your tube on a database like this one (there are others).  If you measure a resistance (usually an ohm or two) the filament is probably OK.  If there is no measurement, i.e. there is infinite resistance, the filament has burned out and broken.  Some quick vacuum tube reading.  There are vacuum tube testers that will tell you if the tube is performing well or not but that's a purchase you probably want to wait on to see if you become addicted to this sport  Icon_biggrin

 


Messages In This Thread
new here !! - by jefferz940 - 02-12-2015, 04:37 PM
RE: new here !! - by morzh - 02-12-2015, 04:46 PM
RE: new here !! - by jefferz940 - 02-12-2015, 04:52 PM
RE: new here !! - by morzh - 02-12-2015, 04:57 PM
RE: new here !! - by jefferz940 - 02-12-2015, 05:08 PM
RE: new here !! - by klondike98 - 02-12-2015, 05:22 PM
RE: new here !! - by KCMike - 02-12-2015, 06:36 PM
RE: new here !! - by jefferz940 - 02-12-2015, 10:13 PM
RE: new here !! - by jefferz940 - 02-12-2015, 11:28 PM
RE: new here !! - by Arran - 02-13-2015, 12:25 AM
RE: new here !! - by sam - 02-13-2015, 05:11 AM
RE: new here !! - by jefferz940 - 02-13-2015, 10:55 AM
RE: new here !! - by klondike98 - 02-13-2015, 11:17 AM
RE: new here !! - by jefferz940 - 02-13-2015, 03:44 PM
RE: new here !! - by klondike98 - 02-13-2015, 05:07 PM
RE: new here !! - by PhilcoJohn - 02-13-2015, 08:07 PM
RE: new here !! - by jefferz940 - 02-13-2015, 08:41 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT 6 chassis screws size???
Hello bridKarl, that sounds right or maybe 8/32 . Sincerely Richardradiorich — 01:00 AM
PT 6 chassis screws size???
Have this done except for missing chassis screws. It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM
Philco model 38 code 121 not receiving signal.
Hello Stormlord, Well done on rewinding that coil it turned fairly good for your first one. Sincerely Richardradiorich — 09:12 PM
Philco model 38 code 121 not receiving signal.
Well here it is. It ain't pretty, but hopefully it'll work. I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM

[-]
Who's Online
There are currently no members online.

>