Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

1927 Eveready (National Carbon) Model 1 TRF Radio
#16

@Radioroslyn:
Well the problem is that the radio used electrolytics to begin with, because there is a definite positive and negative side to the original filter caps and film caps are non-polar and using a non-polar cap in place of a polarized cap can cause some problems.

Especially if you don't get the "inside foil" connected to the ground point, which on the old style paper caps wouldn't of been a problem as they marked the "inside foil" on the older caps but the new caps they don't so you have to figure out which side is the "inside foil" by using a device similar to the one that is used by Mr. Carlson's Lab where it tells you the foil side of the capacitor through an audible RF signal. 

@Rodb: 
One thought I had was just upping the capacitance to 4.7 MFD for both filter caps which would still be within tolerance of the original specs as I have a bunch of 4.7 MFD 250 WVDC electrolytic caps but no 2.2 MFD electrolytic caps higher than 100 WVDC.

Also as for the 50K ohm plate resistor, I have some 47k ohm resistors, and some 56k Ohm resistors at 1/2 watt and 1 Watt, would any of those work in the circuit if I just soldered one of them in across the tie points for the old fuse style resistor's socket above and just left the old resistor in place above for appearances sake?


Messages In This Thread
RE: 1927 Eveready (National Carbon) Model 1 TRF Radio - by captainclock1988 - 07-28-2020, 11:51 AM



Users browsing this thread:
[-]
Recent Posts
Model 80 Antenna Issue?
Thanks Gary and Rod.  I also found an article in the Philco Repair Bench under Service Hints and Tips, about installi...Hamilton — 12:32 PM
Model 80 Antenna Issue?
Hello Hamilton, here is a little information found in our Philco Radio Library at the bottom of the Home page. Hope it ...GarySP — 11:28 AM
Model 80 Antenna Issue?
I did as you suggested and touching the middle of the volume control did nothing so the coil has to be rewound. Any idea...Hamilton — 10:19 AM
1949 Motorola 5A9M
This would be the second portable in the "other radios" forum where I have a similar one in my collection. I h...Arran — 12:41 AM
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
Hi PittsburgTost. The record changer looks like a Garrard or BSR (Likely Garrard). The spindles just pull out and pu...MrFixr55 — 11:57 PM
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
Hello PittsburghToast , Welcome aboard and it looks like gary may have something for you ! now if I dig through my se...radiorich — 11:35 PM
Model 80 Antenna Issue?
You are kind of on the right path. You can touch the grid cap of the Detector/Oscillator 36 tube. I'm expecting a respon...RodB — 08:48 PM
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
Welcome to the Phorum, PittsburghToast!  I found an old thread that my interest you regarding the quality and worth of P...GarySP — 08:48 PM
Looking for any info: 1977 Ford-Philco Console Hi-Fi Turntable and Radio
Welcome to the Phorum! :wave: We do not have anything on that unit in our digital library. There is a Sam's Photof...klondike98 — 08:47 PM
Model 80 Antenna Issue?
I’ve replaced all the caps and resistors and the radio is working but minimal volume unless I put my hand near the re...Hamilton — 08:24 PM

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

>