Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

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: 3 Guest(s)
[-]
Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently 2023 online users. [Complete List]
» 2 Member(s) | 2021 Guest(s)
AvatarAvatar

>