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

Philco 70 output transformer
#23

Got back around to this, surprised the unit can be dialed in at all. The 30 AWG wire I used to rewind the oscillator is app. .2 mm diameter vs app. .15 of the original wire. I wired it up to the coil's original center tap hole, then on up the the coil's original top hole to complete the taps. So the original wire is only app. 75% diameter of what I used, then I am app. 75% of the inductance it needs (don't know how linear inductance builds up though, and how diameter affects it yet). I measure .15 mH currently, but need .26 mH to bring the broadcast band's to app. the 260k IF that this unit uses. I thought someone might have put in a different coil at some point and that's why the radio was parked and when I rewired - same problem. The mounting bracket does look newer than the other coil's brackets and has a orange paint dot on it. Could try substituting the 410pf and 110pf as a simpler solution, but don't know if the spread would work out. My .15 inductance bounced against the 410pf = 641.77 khz vs. .26 against 410 pf = 487.46 when pushed against the middle 750rf would be 260khz if. Also, strange to me, since this is my first coil excursion, I measure .25 mH on the coil outside the aluminum case, but inside .15 - I added some turns to the top, but only a few more mH. Playing this radio with the original NC disease coils gave glimpses of AM like I have never heard, tweaking and dialing in in I heard bass and details that were unreal from an AM unit - also some high frequencies that I did not think possible, so I know it's in there somewhere, even though this non AVC unit will vary, esp. at night. I will find it. With this 30 AWG, the 1st RF and osc. coils don't pump out like the 36 or so wire will, but music now sounds like music ungarbled compared against the old corroded coils. Going to try 36 AWG as some have said. It's starting to pop in like it should even though it's on the side of 260 - fun to tweak the IF side best for the current coils, then rock the oscillator and trimmers to get totally different tones and sounds.


Messages In This Thread
Philco 70 output transformer - by radio1 - 05-06-2020, 07:49 PM
RE: Philco 70 output transformer - by Radioroslyn - 05-06-2020, 08:32 PM
RE: Philco 70 output transformer - by radio1 - 05-06-2020, 08:40 PM
RE: Philco 70 output transformer - by klondike98 - 05-06-2020, 10:45 PM
RE: Philco 70 output transformer - by rfeenstra - 05-06-2020, 11:31 PM
RE: Philco 70 output transformer - by klondike98 - 05-06-2020, 11:56 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 05:45 AM
RE: Philco 70 output transformer - by Steve Davis - 05-07-2020, 08:58 AM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 09:59 AM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 11:20 AM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 11:40 AM
RE: Philco 70 output transformer - by rfeenstra - 05-07-2020, 12:01 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 12:21 PM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 12:46 PM
RE: Philco 70 output transformer - by rfeenstra - 05-07-2020, 12:56 PM
RE: Philco 70 output transformer - by radio1 - 05-07-2020, 07:34 PM
RE: Philco 70 output transformer - by morzh - 05-07-2020, 08:46 PM
RE: Philco 70 output transformer - by radio1 - 05-08-2020, 04:17 PM
RE: Philco 70 output transformer - by morzh - 05-08-2020, 04:51 PM
RE: Philco 70 output transformer - by radio1 - 05-18-2020, 06:52 PM
RE: Philco 70 output transformer - by radio1 - 05-19-2020, 08:26 PM
RE: Philco 70 output transformer - by radio1 - 05-27-2020, 08:19 PM
RE: Philco 70 output transformer - by radio1 - 06-06-2020, 08:22 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Road Trip for a Philco 46-480
Good morning, folks! I’ve finished the cabinet and the electrical restoration, and have detailed those in their respecti...jrblasde — 10:56 AM
Studebaker/Philco AC-2687 car radio
Arran, Thanks for checking you manuals. I appreciate that. Let me know what you find. PhilPdouglaski — 08:46 AM
Studebaker/Philco AC-2687 car radio
I have some car radio service manuals, Riders I think (not to be confused with the big blue binders), so I may see if on...Arran — 01:20 AM
Philco model 40-100
Greetings; Here is an update, I found a listing on fleabay for a similar chassis to yours, and it has a photo of what...Arran — 12:58 AM
Philco model 40-100
Greetings; I think I may have found a clue as to what is missing, from a search I made, there is a rear view of the c...Arran — 12:12 AM
Philco model 40-100
I recently acquired a Philco model 40-100 farm (battery) radio. The radio was in very good condition except the red on f...mhamby — 05:59 PM
Studebaker/Philco AC-2687 car radio
Hello, Richard the radio is an AC-2687 Studebaker model. The Philco model is S -5323 and the chassis p/n is S-5523Pdouglaski — 11:52 AM
48-482 rear panel help
The 48-482 is an AC only set as well, featuring a power transformer. While the transformer shouldn’t get “hot”, it is ye...jrblasde — 11:12 AM
Studebaker/Philco AC-2687 car radio
I gave a Chrysler/MoPar car radio from 1954, it was made by Philco, and it uses two chassis, one has the power supply an...Arran — 11:06 AM
48-482 rear panel help
Hello keithchip. You could make a hardboard back for the set, but make sure you provide plenty of ventilation holes in ...GarySP — 11:04 AM

[-]
Who's Online
There are currently 783 online users. [Complete List]
» 1 Member(s) | 782 Guest(s)
Avatar

>