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

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

$10 Fake Philco Baby Grand radio and a boring weekend
#22

MrFixr55 having the brick inside totally lays waste to the AM band but on FM it pulls in lots of stations.
I wonder how good this radio could be if it was aligned. But I don't know anything about doing rf alignment.
I like watching shango66 do it on YouTube.

I have a WWII vintage dynamotor that puts out something crazy like 250v DC 60w on 24v DC.
I was playing around and on 12.5v it would put out 125v DC so I hooked my cheap 1949 northern electric baby champ AA5 to it.
It worked well and hashfree but it was a bit quiet. Plate voltage was just 125v DC not 160v DC from rectified and filtered mains.
Now this radio came to me with a factory 35v output tube which with an AA5 should have had a 50z5.
Turns out the series string had a resistor in there. I bridged it with a wire and replaced the 35z5 with a 50z5 and the thing sounded better and was one watt cooler.

I think if I took out the bridge wire, and jacked up the dynamotor to 14v, the b+ would be as high as it would be in normal AC mains.
But running on a fully charged 12v battery and dynamotor


Messages In This Thread
RE: $10 Fake Philco Baby Grand radio and a boring weekend - by Oldie Goldie - 01-05-2025, 09:35 PM
462ron - by 462ron - 01-06-2025, 08:56 AM
462ron - by 462ron - 01-07-2025, 08:16 AM
462ron - by 462ron - 01-09-2025, 08:05 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
1949 Motorola 5A9M
LOL!! Well Arran, if you do dive into it and come across any advice on dealing with accessing components let me know. I...klondike98 — 11:56 PM
1949 Motorola 5A9M
Bob and Gary; I have the further complication on the Phillips that they decided to use some 200 volt rated paper caps...Arran — 10:05 PM
1949 Motorola 5A9M
Thx Arran & Gary. Yes its super crowded in the chassis and I've debated whether to try to restuff caps or not. I t...klondike98 — 07:40 PM
1949 Motorola 5A9M
That's got to be one of the tightest conglomeration of components I've ever seen! I wonder how the line workers felt bu...GarySP — 05:46 PM
1949 Motorola 5A9M
Bob; I think that the Phillips was actually manufactured in Canada, though they may have imported many of the compone...Arran — 02:28 PM
1949 Motorola 5A9M
I've started replacing the electrolytic caps now. As Arran mentioned, they are housed under a metal strap. Here's a ph...klondike98 — 12:22 PM
1949 Motorola 5A9M
Thank for that info Arran! Very interesting. Phillips and Motorola must have made some type of marketing deal back then....klondike98 — 11:49 AM
46-1213 Schematic Question
Good idea on the fuse. These old transformers need extra protection.RodB — 10:02 AM
46-1213 Schematic Question
Hello Larry, Well, anyway I can contest about noisey grounds in my living room when I am using one outlet in my house a...radiorich — 08:03 AM
46-1213 Schematic Question
RodB & MrFixr55, Thank you both for the great replies at my questions, I appreciate the help very much.  As suggest...MissouriLarry — 07:04 AM

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

>