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

Silvertone model 4588A tone / flash tuning issue
#2

Swapped out all tubes one by one again, even trying metal tubes where available all to no change. Then I took some voltage readings today.

1.) 5X4 I get 410VAC across pins 3 & 5 (plates), and 358 DC across pins 7 & 8. Schematic calls for 325 V
2.) 6N6's I get 310 on pin 3, and 325 on pin 4. Show be 280 & 290 respectively
3.) 6C5 Phase Changer I get 174 on pin 3 and 8 on pin 8. Should be 165 and 12 respectively
4.) 6C5 2nd AF I get 182 on pin 3 and 8 on pin 8. Should be 155 and 12 respectively
5.) 6Q7 1st AF I get 172 on pin 3. Should be 110
6.) 6J7 AFC I get 214 on pin 3, 111 on pin 4, and 3 on pin 8. Should be 190, 90, and 4.25 respectively
7.) 6C5 OSC I get 81 on pin 3. Should be 90
8.) 6K7 IF I get 283 on pin 3, 84 on pin 4, 1.2 on pin 5 and 7.2 on pin 8. Should be 255, 110, 4.25, 4.25
9.) 6K7 RF I get 281 on pin 3, 83 on pin 4, 1 on pin 5 and 9.7 on pin 8. Should be 255, 110, 7, 7
10.) 6L7 translator I get 281 on pin 3, 84 pin 4, 0 on pin 5, and 9.7 on pin 8. Should be 255, 110, 7, 7

Voltages are running a bit high in general, and none on pin 5's of the 6K7 RF and 6L7 tubes. I can hear the contacts arcing under the chassis when the set is first turned on. The flash tuning light flickers on and off for about 10-15 seconds then it settles down. Need to try to figure out how to get those contacts apart and see why no voltage appears on pin 5.

Greg V.
West Bend, WI
Member WARCI.org





Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Model 70 Cabinet Trim
musar , Well if you have any more questions feel free to post away . Sincerely Richardradiorich — 08:56 PM
Model 70 Cabinet Trim
Although I have not made any cabinets or cabinet parts for a couple of years, I still have some parts left over, includi...Steve Davis — 06:26 PM
philcorepairbench.com - shadow-meter
Thanks Ron.fenbach — 02:43 PM
Model 70 Cabinet Trim
Thank you, Gary. Before making my original post, I had clicked on "Steve Davis Cabinets" only to find that it...musar — 02:25 PM
philco predicta
Welcome to the Phorum, cgl18! I am not your resource for television repair, but lots of friendly help is available here...GarySP — 02:12 PM
Model 70 Cabinet Trim
Welcome to the Phorum, musar! You can send Steve Davis a private message (PM). The site is at the top of the Home page...GarySP — 02:09 PM
Model 70 Cabinet Trim
How do I contact him? The only contact information for him I could find when searching online was a telephone number th...musar — 10:38 AM
philco predicta
Hello, good afternoon, I would like to ask what the possible problem could be if I don't have an image on the screen. I ...cgl18 — 10:19 AM
Philco model 38 code 121 not receiving signal.
So one last question before I finish this radio. Regarding the speaker and output transformer. I salvaged the original o...Stormlord5500 — 09:31 AM
462ron
It’s on the bottom of the homepage of our Philcoradio.com homepage! Ron462ron — 07:20 AM

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

>