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

42-1008P ALigntment
#1

I have the BC band aligned as good as I can get it. A tad off on the higher freq's but not to bad.

As far as the SW band goes it is a bit off.

I followed the instructions and get 15MHz dialed in but then when I go down to 10MHz to dial in WWV it actual sits around 10.2-10.3MHz

Is this normal?

Do these things never line up as good as we'd like?
#2

You Know. Aligning a radio is more than just getting the stations lined up with the dial. Afteran 'alignment" the stations should come in clearer, etc not just on the dial mark.
#3

I just had same thing happen on my 42-1012 see thread. Found that the Mica Caps around the Osc tube were way off in value. After replacement radio worked and aligned perfect. Also if you get same stations on 2 different frequencies about 1 Mhz apart (image) replacing the mica caps take care of that too.

Skip...
#4

I guess I'd better go find your thread and look it over.

I am getting that same behavior.
#5

I had the Caps on hand. Normally you do not have to replace Mica Caps. But looks like these old radios some if not all of the caps drift. Do you have a capacitor meter? easier to check caps around your Osc tube then trying to replace all of them.. Mine were way out of spec..

Skip...
#6

Looks like she'll be heading back to the bench Icon_smile
#7

Looking into the mica's now and they don't seem to match up w/ my schematic.

Example: (13) says it's supposed to be a 325 but I read it as a 23 (red, orange, blk???), (4) supposed to be 250 I read it as 600 (blue, blk, bwn)

I also see a resistor (12) on the schematic that is not there. Well its not where it shows in the drawing.

Getting confused :\

http://www.nostalgiaair.org/PagesByModel...013487.pdf

ETA: I need to double check things. I must be looking at things wrong.
#8

You need to measure the Caps using the Capacitor tester. The mica Caps read a little different depending on if they use 3 dots or 6 dots. Plus it hard to tell the colors on them since they are over 70 years old.

SKip..
#9

Ok here is what I see comparing schem to actual parts


Schem / actual part

(4) 250uuF / 600uuF (BL,BK,BN)

(5) 360uuF / 046uuF (BK,Y, BL)

(10) 10uuF / 10uuf (BN, BK, BK)

(12) 680ohm / 1k and found it tucked behind and right on the Osc. coil terminals

(13) 325uuF / 32uuF (BK, O, R)

(16) 300uuF / 300uuF (O, BK, BN)

(20) 250uuF \ 600uuF (BL,BK,BN)

(24) 250uuF / 250uuF (R, BK, BN)

From what it looks like these appear to be original from what it looks like anyway. (5) and (13) I'm not 100% on, hard to get to and values of what I am getting from the color codes seem odd???
#10

From what I can tell the two important ones to focus on for SW alignment are (5) and (13).

My meter is reading 360 for (5) and 370 for (13)
#11

Most of the Philcos I have worked on seemed to have some nonstandard color code on the mica caps. Other manufacturers micas seem to use the standard code. But it seems like Philco had some other color code on them.
#12

Have you made any progress? Another way to bring in the alignment is to put a small value cap across the tuning cap to give it more range.. That will not take care of the signals appearing on frequencies approx 1 Mhz apart, it will just allow you to get the frequency and dial aligned.

Skip...
#13

Following the instructions the best I can get is 10.2MHz on the dial for 10MHz and 15MHz on the dial for 15Mhz.
#14

That is pretty good, actually. You may not get any better than that.

--
Ron Ramirez
Ferdinand IN
#15

Well if that is expected then I'm going to call it.




Users browsing this thread: 3 Guest(s)
[-]
Recent Posts
Philco 46-420 Code 121 Reception issues
Welcome Eric, I agree with Bob and far as the two main electrolytic filter capacitors did you change them yourself or w...radiorich — 11:43 PM
Philco 46-420 Code 121 Reception issues
You mentioned the Philco manual and going through the check points...just to be sure we're on the same page here's the m...klondike98 — 08:13 PM
Philco 42-1008 conversion kit
Interesting. I haven't seen that before.klondike98 — 07:02 PM
12' Philco
Yes I had looked for it on the web as well some time back and could not find it. I was glad to see it turned up in Ron'...klondike98 — 06:59 PM
Shadow Meter Bulb
Now if you had a set with a tuning light then the bulb type is important to the circuit, some sets used those prior to t...Arran — 04:58 PM
Shadow Meter Bulb
Ok. Thanks for the correction.RossH — 03:09 PM
Model 28L
For 28 you will probably need to buy a Hammond 125CSE. Or any of the series of the power you need, with SE suffix. Then ...morzh — 02:09 PM
37-60 revision 6
I am restoring a Philco 37-60 and it shows run 6 they removed the ground from G3 of the 6K7G and put the G3 to -2.5v for...bobbyd1200 — 01:01 PM
Shadow Meter Bulb
Mike is correct on the bulb connection, two separate circuits. I found that by rotating the bulb and sliding it forward ...RodB — 12:19 PM
Hickok AC51 tube tester
Cleaned ann contacts, switches and sockets, works great now.martinj — 11:32 AM

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

>