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

Alignment.
#1

That little thing gives me plenty of headache. After fixing the 6A8 tube (all contacts inside the base were loose, go figure),
alignment was an order of things. The set is very sensitive and receives many stations but all over the place with at least 20K.C. discrepancy, and that discrepancy is not linear.1500 is at 1200, 800 is at630, etc. The alignment procedure is written very laconically. So, first to k work with are 2 IF tr-rs, then the wave trap,after that 3 other trimmers, that takes care of BC alignment.All has been done,but even after that the same problem still persists.The only thing damaged in this set was the osc. coil, which I rewound with exact amount of turns observing correct rotation.The only difference- slightly thicker wire gauge.Did not touch any micas. One issue I had was the trimmer J - I was running out of capacity to the point that I almost cracked the porcelain base of it.It is about 390PF max. So, I added in parallel 40PF with no positive results.
Any ideas? Thanks.

http://www.nostalgiaair.org/PagesByModel...0025008.pd


Messages In This Thread
Alignment. - by fields 100 - 09-29-2014, 04:50 PM
RE: Alignment. - by Radioroslyn - 09-29-2014, 09:33 PM
RE: Alignment. - by fields 100 - 09-29-2014, 10:36 PM
RE: Alignment. - by Radioroslyn - 09-30-2014, 06:36 AM
RE: Alignment. - by fields 100 - 09-30-2014, 07:21 AM
RE: Alignment. - by Radioroslyn - 09-30-2014, 05:03 PM
RE: Alignment. - by fields 100 - 09-30-2014, 05:53 PM
RE: Alignment. - by Radioroslyn - 09-30-2014, 08:20 PM
RE: Alignment. - by fields 100 - 09-30-2014, 09:51 PM
RE: Alignment. - by Radioroslyn - 10-01-2014, 07:07 PM
RE: Alignment. - by morzh - 10-01-2014, 08:00 PM
RE: Alignment. - by fields 100 - 10-01-2014, 10:04 PM
RE: Alignment. - by mikethedruid - 10-03-2014, 12:37 AM
RE: Alignment. - by fields 100 - 10-03-2014, 07:31 AM
RE: Alignment. - by AI2V - 10-04-2014, 11:07 AM
RE: Alignment. - by fields 100 - 10-05-2014, 06:13 AM
RE: Alignment. - by Radioroslyn - 10-05-2014, 09:11 AM
RE: Alignment. - by Mondial - 10-05-2014, 09:37 AM
RE: Alignment. - by AI2V - 10-05-2014, 11:05 AM
RE: Alignment. - by fields 100 - 10-06-2014, 06:30 AM
RE: Alignment. - by Mondial - 10-06-2014, 09:20 AM
RE: Alignment. - by fields 100 - 10-06-2014, 11:12 AM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
Correct model 84 Ac plug an cord type
From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM
Correct model 84 Ac plug an cord type
Hi Bruce, I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM
Restoring Philco 38-14
OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder. I put a scope on the o...morzh — 08:15 PM
Correct model 84 Ac plug an cord type
Hello Bruce, I mostly use brown far as my cloth powercords go ! Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM
Correct model 84 Ac plug an cord type
Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM
Restoring Philco 38-14
Rod Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM
Restoring Philco 38-14
Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM
Restoring Philco 38-14
hello morzh , That sounds like a plan ! Sincerely Richardradiorich — 07:45 AM
Restoring Philco 38-14
Richard, It helped some, but I still had the whining when engaging the rear power strip (I did not realize it was fro...morzh — 07:07 AM
Restoring Philco 38-14
Hello morzh, Yes , that dreaded hum in my room where i do alighment I have my cable modem and router plus desktop plus ...radiorich — 11:25 PM

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

>