N1BCG
Member
 Offline
Posts: 836
|
 |
« Reply #50 on: March 26, 2017, 09:24:48 PM » |
|
Time for the gloves to come off. With the 6AU6 removed, is there any voltage between pin 5 (+) and pin 7 (-) ?
What this does is use the plate supply as a high voltage source and the meter would indicate if the cathode circuit has any resistance to ground. In theory it does, and that's what's causing the oscillation.
This may be easier (and safer) from the top unless you have steady fingers.
|
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #51 on: March 26, 2017, 09:29:12 PM » |
|
is it going to be DC or AC, just so i preset meter right
|
|
|
|
|
Logged
|
|
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #52 on: March 26, 2017, 09:31:19 PM » |
|
D.C. Try a high range first
|
|
|
|
|
Logged
|
|
|
|
KB2WIG
Contributing
Member
Offline
Posts: 4484
|
|
« Reply #53 on: March 26, 2017, 09:31:53 PM » |
|
I made popcorn; I'll be sticking around for this.
klc
|
|
|
|
|
Logged
|
What? Me worry?
|
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #54 on: March 26, 2017, 09:33:56 PM » |
|
I made popcorn; I'll be sticking around for this Ambulance chaser... ;-) |
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #55 on: March 26, 2017, 09:36:01 PM » |
|
lol it was -366 hands were out lol, i have grippers
|
|
|
|
|
Logged
|
|
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #56 on: March 26, 2017, 09:37:53 PM » |
|
lol it was -366 hands were out lol, i have grippers
There you go. Something is completing the circuit from pin 7 on that socket to ground. |
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #57 on: March 26, 2017, 09:45:54 PM » |
|
so I need to trace that out....any other ideas, shall we think about it and continue tomorrow, or another day?
|
|
|
|
|
Logged
|
|
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #58 on: March 26, 2017, 09:53:26 PM » |
|
so I need to trace that out....any other ideas, shall we think about it and continue tomorrow, or another day? That's up to you. Things need to be disconnected from pin 7 on that socket until the zombie oscillation stops. |
|
|
|
Logged
|
|
|
|
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
Offline
Posts: 1770
|
|
« Reply #59 on: March 26, 2017, 10:01:47 PM » |
|
I would start tracing from the 8 pin Octal Accessory Plug and then back to V6, Pin 7.
I had one on the bench one time that had Pin 1 of the 8 pin Octal Accessory Plug shorted to pin 8 of the 8 pin Octal Accessory Plug.
Phil - AC0OB
|
|
|
|
|
Logged
|
Charlie Eppes: Dad would be so happy if we married a doctor. Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse. NUMB3RS  |
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #60 on: March 26, 2017, 10:09:13 PM » |
|
Ok 3 things on that #7, the cap, a blue wire, and a weird looking shunt Ill start with the blue wire |
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #61 on: March 26, 2017, 10:10:49 PM » |
|
Well it looks like the ground is on the line with the shunt SH3 I did disconnect the accessory socket, ground was still there
|
|
|
|
|
Logged
|
|
|
|
KB2WIG
Contributing
Member
Offline
Posts: 4484
|
|
« Reply #62 on: March 26, 2017, 10:12:49 PM » |
|
C
That was mean --- no Weihenstephaner Hefe Weissebier for you. I'll drink all of it and you'll be sorry.... ..
|
|
|
|
Logged
|
What? Me worry?
|
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #63 on: March 26, 2017, 10:16:26 PM » |
|
Well it looks like the ground is on the line with the shunt SH3 I did disconnect the accessory socket, ground was still there It could then either be something with SW3 or the lead to the meter switch. |
|
|
|
|
Logged
|
|
|
|
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
Offline
Posts: 1770
|
|
« Reply #64 on: March 26, 2017, 10:17:26 PM » |
|
Ok 3 things on that #7, the cap, a blue wire, and a weird looking shunt Ill start with the blue wire The shunt should be a 5.1 ohm resistor. You could also have pinched or grounded meter wires. Check those as well. Phil - AC0OB |
|
|
|
|
Logged
|
Charlie Eppes: Dad would be so happy if we married a doctor. Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse. NUMB3RS |
|
|
N1BCG
Member
Offline
Posts: 836
|
|
« Reply #65 on: March 26, 2017, 10:18:10 PM » |
|
C
That was mean --- no Weihenstephaner Hefe Weissebier for you. I'll drink all of it and you'll be sorry.... ..
I'm going to assume that I'm "C", so as Jackie Gleason once said "You are stark, staring nuts". |
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #66 on: March 26, 2017, 10:20:04 PM » |
|
Shut is 5.4 Ω
|
|
|
|
|
Logged
|
|
|
|
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
Offline
Posts: 1770
|
|
« Reply #67 on: March 26, 2017, 10:24:59 PM » |
|
Shut is 5.4 Ω
Good enough. If it is not a shorted wire from the 8 pin Octal Accessory Plug, then the short has to be coming from the meter switch. I have seen bent pins on the meter switch making contact as well. Phil - AC0OB |
|
|
|
|
Logged
|
Charlie Eppes: Dad would be so happy if we married a doctor. Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse. NUMB3RS |
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #68 on: March 26, 2017, 10:25:43 PM » |
|
Ok Im off to the meter switch
|
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #69 on: March 26, 2017, 10:29:52 PM » |
|
bent pins meaning making contact when the switch is not aligned for it to make a contact? Quick inspection they all look straight, I may have to take the rest of the case off to see it better
|
|
|
|
|
Logged
|
|
|
|
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
Offline
Posts: 1770
|
|
« Reply #70 on: March 26, 2017, 10:33:58 PM » |
|
bent pins meaning making contact when the switch is not aligned for it to make a contact? Quick inspection they all look straight, I may have to take the rest of the case off to see it better
Remove V2 for a better view. If not bent or broken pins at the meter switch, then you may have one of the two wires coming from the shunt resistor that has been scraped or burnt and is making contact with the chassis. BTW, I have a Viking II-CDC and love it.  Got a small mirror and a bright light? |
|
|
|
|
Logged
|
Charlie Eppes: Dad would be so happy if we married a doctor. Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse. NUMB3RS |
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #71 on: March 26, 2017, 10:35:07 PM » |
|
I love the transmitter, just this one little issue to remedy and I am home free I hope |
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #72 on: March 26, 2017, 10:47:42 PM » |
|
yes i checked it with a mirror and bright light. So back by the shunt, the shunt connects to a standoff with two brown wires, one wire goes to the pin 8 (its ok), the other brown wire has the ground, tracing it out now
|
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #73 on: March 26, 2017, 10:57:11 PM » |
|
Brown wire went to CW/phone switch where it met another brown wire . So from the tube to the switch is good, off tracing on the other brown wire now from the cw/phone switch
|
|
|
|
|
Logged
|
|
|
|
KC3GMQ
Member
Offline
Posts: 173
|
|
« Reply #74 on: March 26, 2017, 11:03:35 PM » |
|
at cw/phone switch, the ground is now on the orange wire following lol
|
|
|
|
|
Logged
|
|
|
|
|
