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Philco model 18 (code 121) - HELP!
#42

Thanks guys, I'll have to go back and get some more 450's the only place I can find them is online. Is that what you find as well? Or is there a physical place you go to get them? Radio shack doesn't really have a whole lot.

I still need to check my voltages, didn't do that yet but I will. In the meantime, I have some tuning questions:

I need some help tuning this radio. This is a Philco model 18 (code 121) and the schematics show how to use the signal generator to tune this radio but they don’t tell you where to put the (+) & (-) leads from the multi-meter, so I need some help with that. Basically I would like to know where to put the leads from the multi-meter and signal generator and get some confirmation on a few things.

From what I can see, it looks like there are three stages to tuning the radio. I have these three stages broken out below and I have some questions for each stage.

STAGE 1: I.F. Intermediate Frequency –3 adjustments

QUESTION 1: Where do you put the leads for your multi-meter? Instructions say connect to ‘primary output transformer’ but I do not know where that is?
QUESTION 2: (Please confirm) With the multi-meter hooked up properly, I just tighten/loosen the hex bolt and look for the highest voltage rating on the multi-meter, correct?

Making the 1st, 2nd & 3rd adjustments:
(1) QUESTION 3: (Please confirm) Signal Generator at 260 kc and connected to the cap on the 6A7 tube (with 6A7 grid cap wire unplugged).
(2) 1st adjustment - adjust the 1st I.F. Primary (which is # 24 on the 121 schematic) hex bolt tighten/loosen
(3) 2nd adjustment - adjust the 1st I.F. Secondary (which is # 25 on the 121 schematic) hex bolt tighten/loosen
(4) 3rd adjustment - adjust the 2nd I.F. Primary (which is # 28 on the 121 schematic) hex bolt tighten/loosen


STAGE 2: ANT. H.F. Detector and the OSC. H.F. Condensers –3 adjustments

I had to go to the schematics for the code 124 on this one. The schematics I had for the 121 were incomplete. I had to use the 124 instructions and tie back the correct part number to match my code 121 schematics. The schematics state that these 3 adjustments ‘are located on top of the Tuning Condenser and are adjusted from above’.

Here are my questions:
QUESTION 4: (Please confirm) I see 3 screws on top of the Tuning condenser (one of them is connected to the 6A7 tube) I believe that these three screws need to be adjusted for the ANT. H.F. Detector and the OSC. H.F. Condensers correct?
QUESTION 5: Where do you put the two leads from the multi-meter? And is it the same place for all three of these adjustments?

Making the 4th, 5th, & 6th adjustments:
(1) Replace the 6A7 grid cap wire and hook up the sig generator antenna lead to the antenna post.
QUESTION 6: Does ‘antenna post’ mean connect the sig generator lead to the antenna wire/clip on the chassis at the back of the radio?
(2) 4th adjustment - QUESTION 7: First, adjust the “OSC; H.F” (#15 on the 121 schematic. This is the screw that is NOT near front of radio AND NOT connected to the 6A7 grid cap wire—Please confirm) – Set Sig-Gen to 1500 kc
(3) 5th adjustment - QUESTION 8: Second, adjust the “Detector: (#11 on the 121 schematic. This is the screw connected to the 6A7 grid cap wire—Please confirm) – Set Sig Gen to 1400 kc
(4) 6th adjustment - QUESTION 9: Third, adjust the The “ANT; H.F.” (#8 on the 121 schematic. This is the screw closest to the front of the radio—Please confirm) – Sig Gen at 1400 kc


STAGE 3: “OSC.; L.F.” Condenser –1 adjustments

QUESTION 10: Where do I connect the lead from the sig generator?
QUESTION 11: Where do you put the two leads from the multi-meter?

Making the 7th adjustment:
(1) Set station sig generator and station to 600 kc
(2) 7th adjustment - (#18 on the 121 schematic the “OSC.; L.F.” condenser) adjust from the rear of chassis the hex bolt (tighten/loosen) until you see highest voltage rating.
(3) Tuning condenser should be rocked while adjustment is made.

QUESTION 12: I saw a guy on You Tube tuning his radio but he had to solder in a 0.5 ufd capacitor to one of the ends of a tube pin…do I need to do anything strange like that here?

Please let me know if anything listed above looks incorrect, I’ve never done this before.
Thanks for your help!


Messages In This Thread
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-07-2013, 10:22 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-08-2013, 10:32 PM
RE: Philco model 18 (code 121) - HELP! - by Arran - 02-08-2013, 10:49 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 02:21 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 05:57 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-09-2013, 06:12 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-13-2013, 08:40 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-21-2013, 05:25 PM
RE: Philco model 18 (code 121) - HELP! - by Pithicus999 - 02-26-2013, 03:54 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 02-28-2013, 06:04 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 03-07-2013, 04:16 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 03-07-2013, 11:20 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-17-2013, 01:25 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-18-2013, 08:48 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-18-2013, 09:49 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 04-29-2013, 10:02 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 06-12-2013, 01:37 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 06-13-2013, 08:33 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 07-23-2013, 10:33 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 07-24-2013, 11:11 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 08-02-2013, 05:06 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 08-21-2013, 10:26 AM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-17-2013, 10:58 AM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-19-2013, 12:47 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 12-19-2013, 08:48 PM
RE: Philco model 18 (code 121) - HELP! - by morzh - 01-17-2014, 04:05 PM



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