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

48-482
#16

it lives!!!! on all three bands no less.this thing needed almost as many parts as my halli. sx-62!!! but i noticed i got a lot of static and noise in the am band around 700kc and below and no reception i thought maybe the shaft wipers were still dirty but closer  scrutiny revealed that some pinhead i guess  didnt want stations below 700kc and bent the ends of the outboard rotor vanes in so that they would short against the stator. i say this as they were bent in on the b.c. tuning segment ONLY. i cant see this happening accidentally  but concede its possible. i then noticed that there was wire insulation jammed in between the stator vanes and frame. why ive no idea. if its factory will someone let me know why?


Attached Files Image(s)
   
#17

im getting ready to start the alignment on this set. they want the pointer set to the "index line" with the tuner fully closed. i just looked at the dial and i just dont see what they are talking about. my instincts tell me to adjust the pointer so that its entire range of movement is centered on the scale, but that doesnt seem correct in this case does anyone know?
#18

its amazing what a readable set of alignment instructions will do for you. i figured it out.
#19

so i made up a loading unit,for the z403 if ,put a jumper to chassis on the fm 1000 pin 2, got  it the thing all wired and warmed up. turned on the generator at a moderate level on am 400 hz mod. i start fiddling c403c and there is something wrong as ive no tone. check the hookups and recheck. nothing dead as a post.by this time i got the generator at max (kenwood sg-5115). finally i decided to to see if the i.f was resonating at ANY frequency. it resonates like mad at 8.7 mc.i tried walking the if up frequency wise while adjusting c403c it wont budge.hmmm maybe c403b has something to do with this nope! its 8.7 ONLY. i ran a frequency counter on the generator and its right on the money at 9.1. is my if transformer toast? its also important to note that i could get some fm but rather weak on two stations. ive replaced all the paper caps and resistors
#20

in the absence of any adult supervision i pressed on. it would seem that with all the parts i replaced the i.f. will have to be adjusted 0ne more time. i ran the whole string and will need to do it again as the closer i got to the first i.f. the better it got until at the 1st if it peaked as it should. a revisit to step one and two brought success as well. ill finish it up on the morrow. i cant understand why they dont just have you START at the first i.f. like other radios. it would have saved a lot of grief. UNLESS there is a reason i dont quite understand????




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Need Help to ID this radio 11 tube Philco
It is a 16B tombstone.morzh — 06:13 PM
Zenith H725
David - sorry, I reread your post and finally saw THD - now the % figures make sense. Thanks for explaining. The PSU...EdHolland — 06:06 PM
Need Help to ID this radio 11 tube Philco
Hi Everyone, New member but have been reading this for awhile for tips! Vaccum tubes were before my time so bear with ...Ken D. — 06:03 PM
My Philco 37-116 Restore
Thank you MrFixR55, I appreciate your comments very much. I do not detect much hum if any so I will be staying with the ...dconant — 05:15 PM
My Philco 37-116 Restore
Hi DConant Yes, you can replace chokes with resistors.  You do stand the risk of increased hum.  the solution is to inc...MrFixr55 — 04:23 PM
Zenith H725
1.7-3.9 %, a modified Sine wave inverter is around 25%. Most generators from big box stores run 10% at a 50% load. What ...David — 04:06 PM
My Philco 37-116 Restore
I am having a heck of a time doing the alignment on the AM band. I can't seem to dial in the 1500 KC oscillator. I can h...dconant — 03:35 PM
Zenith H725
David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)? Budget constraints for Ham ...EdHolland — 01:43 PM
My Philco 37-116 Restore
You're doing great. I wish I could be more involved, but my mind is right now preoccupied with the reason I am here in ...morzh — 12:21 PM
My Philco 37-116 Restore
Hope you guys are still with me. I have moved on to the alignment. I completed the IF alignment which was pretty muc...dconant — 10:47 AM

[-]
Who's Online
There are currently 707 online users. [Complete List]
» 1 Member(s) | 706 Guest(s)
Avatar

>