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

Help Please! 38-116 Troubles
#9

OK, I found #111, not where it should be and way out of spec, like 220ohm instead of 25,000 so I changed it out and put it back by the bakelite condenser.

I do have feedback when I touch the top of the 6r7 and I went one step further, the 1 meg resistor in the tube cap circuit that wnet nowhere, well it should go to resistor #111, I did that and my pin #3 voltage on the 6r7 went from 45 volts to 89 volts(spec is 70v) and it did not kill the static like before. Should I be concerned now that the voltage is 10 - 20 volts higher everywhere if the negative bias is pretty much at spec?
Grid voltage still holding at -25.5 by the 6l6's
Static can be controlled by the volume and treble/selectivity but bass compensation has little to no effect. We are making great progress!!
The 20 ohm resistor (your#133) has seen a lot of heat at one point, (all the paint is burned off still checks decent 24ohms), I have a 33ohm would it hurt to put that big of one in?
And yes -25.4 on both 6l6's, voltage on the plate of both tubes are now 300v and at pin 4 they are at 312volts.

Bob


Messages In This Thread
Help Please! 38-116 Troubles - by bm071 - 11-28-2011, 01:54 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 11-28-2011, 02:31 PM
Re: Help Please! 38-116 Troubles - by bm071 - 11-28-2011, 09:32 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 11-28-2011, 10:25 PM
Re: Help Please! 38-116 Troubles - by bm071 - 11-29-2011, 01:18 PM
Re: Help Please! 38-116 Troubles - by bm071 - 11-29-2011, 09:38 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 11-29-2011, 09:55 PM
Re: Help Please! 38-116 Troubles - by bm071 - 11-29-2011, 11:52 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 11-30-2011, 05:36 PM
Re: Help Please! 38-116 Troubles - by bm071 - 11-30-2011, 10:35 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 11-30-2011, 11:19 PM
Re: Help Please! 38-116 Troubles - by bm071 - 12-01-2011, 08:06 AM
Re: Help Please! 38-116 Troubles - by 7estatdef - 12-01-2011, 05:51 PM
Re: Help Please! 38-116 Troubles - by bm071 - 12-01-2011, 09:47 PM
Re: Help Please! 38-116 Troubles - by bm071 - 12-01-2011, 10:34 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 12-01-2011, 11:28 PM
Re: Help Please! 38-116 Troubles - by bm071 - 12-15-2011, 07:40 PM
Re: Help Please! 38-116 Troubles - by 7estatdef - 12-15-2011, 08:31 PM
Re: Help Please! 38-116 Troubles - by bm071 - 12-20-2011, 09:08 PM
Re: Help Please! 38-116 Troubles - by codefox1 - 12-21-2011, 01:40 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.

>