Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

37-84
#5

Thanks once again, Terry. Here's the progress report:

I did the OSC test with a second radio. I had this 37-84 set to 620 AM on the dial, and the second radio set to around 1100 and could hear the OSC coming through the test radio. The station didn't come through but I knew I found the OSC, as when I turned the 38-84 off, I got normal static on the second radio. Repeated the test with another restored tube radio and got the same results. Now the rewound primary on the OSC coil still has gaps between the windings, but the right number of turns and wound in the right direction. I'm getting a lot of stations (with the test ANT coil...see below), just not the strong local one at 1470 but I suspect I may need to do an alignment to find it. So I'm kinda on the fence if I should try rewinding the coil to get the windings closer or leave it as is?

I unhooked the existing ANT coil wires (which measured 2.6 ohms on the primary and 5.7 ohms on the secondary) and gator wired in the antenna coil I have from a parted out model 89. That primary measures 16.5 ohms and the secondary 9 ohms.

With the model 89 ANT coil, the radio has good volume and control of volume. And received lots of stations. Then I disconnected the model 89 ANT coil and  gator wired the ANT coil from the radio back in, not touching the tuner or volume control. With the ANT coil from this radio I have very low volume. Yet neither winding reads open. Possibly it's green spots cutting down on the volume? Or could the higher resistance on the model 89 coil be boosting the volume? I suspect rewinding the primary of the ANT coil is next. I'm still using the volume control that was in the radio, and measures around 500K. I'm trying to find one that measures 20K as the schematic calls for. Not sure how much it will affect the performance, though.

Oh, and Dad says hi Icon_wave

Greg V.
West Bend, WI
Member WARCI.org


Messages In This Thread
37-84 - by NostalgiaRadioTime - 03-18-2018, 10:36 PM
RE: 37-84 - by Radioroslyn - 03-19-2018, 12:41 PM
RE: 37-84 - by NostalgiaRadioTime - 03-19-2018, 10:28 PM
RE: 37-84 - by Radioroslyn - 03-19-2018, 11:20 PM
RE: 37-84 - by NostalgiaRadioTime - 03-20-2018, 10:29 PM
RE: 37-84 - by 462ron - 03-21-2018, 03:55 PM
RE: 37-84 - by Radioroslyn - 03-21-2018, 08:55 PM
RE: 37-84 - by 462ron - 03-22-2018, 09:39 AM
RE: 37-84 - by NostalgiaRadioTime - 03-23-2018, 10:49 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM
Hickok AC51 tube tester
Absolutely no one is going to reverse engineer that circuit. Even the iron core is missing.RodB — 10:37 AM
IF can wire size and Rubber mounts?
Thanks to both members for your help regarding wire and tuner mtg supports. regards--Johngeorgetownjohn — 09:33 AM
Hickok AC51 tube tester
Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full s...DaleHCook — 07:09 AM
IF can wire size and Rubber mounts?
A pair of wire strippers can give you an idea of what the existing gauge of the wire leads are in the IF can, I think it...Arran — 06:07 AM
My last cabinet for this year
Hello Dan, That is really beautiful what great looking radio you have ! I have friends who live in Calgary and the wea...radiorich — 01:51 AM

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

>