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

Craftsman RC200 resto
#4

I did some checks last night now that I have the schematic. I checked from B+ to chassis and no shorts. Found a 20a fuse in the 3a holder - not good. I disconnected the power transformer HV from the chassis, checked again for shorts. Then stuck a dim bulb tester and amp meter in the AC line, then did a slow power up via the variac. So far so good. Current stayed around .5 amp or so and the bulb was very dim. All the tubes lit, next I checked the output from the PT. I was at 216 ac across and 107, 106 to center tap. That was at 120v on the line. Looks like the transformer has hopes. Next, (don't shoot me!) I reconnected the PT leads and did a slow power up to about 50v, then again to about 70v while monitoring the B+ and current. I also had the scope on the H output grid. Current stayed near .7a, and the DC was sitting around 107 off L1, and 50 off L2. These are the 2 main B+ sources. I let it sit for a few minutes and powered off. To the touch I had a 400v cap under chassis barely warm and one of the cans. So I know there is some leakage. I didn't observe anything starting up like the H-osc, vertical or sound. I did note that it has had some vertical circuit work done, about all of it. Looks like an osc transformer, soldering around the sync amp and possibly a vertical output transformer. Typical. What is it about the vertical section that is always so troublesome? Even into the more modern sets. Oh well, more later.

If I could find the place called "Somewhere", I could find "Anything" Icon_confused

Tim

Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44


Messages In This Thread
Craftsman RC200 resto - by TV MAN - 12-25-2018, 05:41 PM
RE: Craftsman RC200 resto - by Paul Philco322 - 12-25-2018, 06:34 PM
RE: Craftsman RC200 resto - by Arran - 12-30-2018, 05:47 PM
RE: Craftsman RC200 resto - by TV MAN - 01-06-2019, 12:29 AM
RE: Craftsman RC200 resto - by TV MAN - 01-07-2019, 12:38 AM
RE: Craftsman RC200 resto - by TV MAN - 01-29-2019, 02:22 PM
RE: Craftsman RC200 resto - by TV MAN - 02-08-2019, 01:06 PM
RE: Craftsman RC200 resto - by KCMike - 02-08-2019, 01:15 PM
RE: Craftsman RC200 resto - by TV MAN - 02-09-2019, 03:39 PM
RE: Craftsman RC200 resto - by Arran - 02-10-2019, 02:39 AM
RE: Craftsman RC200 resto - by TV MAN - 02-11-2019, 09:38 PM
RE: Craftsman RC200 resto - by TV MAN - 07-04-2019, 10:43 AM
RE: Craftsman RC200 resto - by TV MAN - 03-13-2020, 09:23 PM
RE: Craftsman RC200 resto - by TV MAN - 03-16-2020, 02:12 PM
RE: Craftsman RC200 resto - by TV MAN - 11-25-2020, 09:06 PM
RE: Craftsman RC200 resto - by MrFixr55 - 11-28-2020, 12:30 AM
RE: Craftsman RC200 resto - by TV MAN - 12-03-2020, 11:18 PM
RE: Craftsman RC200 resto - by TV MAN - 12-13-2020, 04:21 PM
RE: Craftsman RC200 resto - by TV MAN - 12-31-2020, 02:46 PM
RE: Craftsman RC200 resto - by morzh - 12-31-2020, 04:29 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Zenith H725
The PSU filter cap arrived today (thank you USPS!) so I will work on that later. Meanwhile, I have the dial, speaker...EdHolland — 06:42 PM
Philco 610B oscillator wiring
Thanks Terry. After checking my notes I think I recorded about -10v at the 6A7 G4/control grid. The screen grid (G3 &...Tubester — 05:59 PM
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM
Philco 42-345 Restoration/Repair
Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM
Philco 610B oscillator wiring
Thanks David! I do have that same later prodution model 610 schematic. I've also studied the Philco service bulletins fo...Tubester — 08:12 PM
Philco 610B oscillator wiring
Some info from Beitmans says late production. David   David — 06:06 PM
Restoring Philco 96
Oh wow! Just found this thread.  Brings me back to early days on this phorum.  I did a 96 back in 2017.  Thread here: ...rfeenstra — 06:05 PM

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

>