[Pithicus999]

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!