B-504 battery-line operated
DeWald Radio Mfg. Corp., Pierce Airo Inc.
- Pays
- Etats-Unis
- Fabricant / Marque
- DeWald Radio Mfg. Corp., Pierce Airo Inc.
- Année
- 1948
- Catégorie
- Radio - ou tuner d'après la guerre 1939-45
- Radiomuseum.org ID
- 37732
-
- Brand: Pierce Airo
SAMS Photofact 8/48 Folder 4813-9 Set 43
From Canadian eBay seller 11_milehouse.
From Canadian eBay seller 11_milehouse.
From Canadian eBay seller 11_milehouse.
Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.
- No. de tubes
- 4
- Principe général
- Super hétérodyne (en général); FI/IF 455 kHz; 2 Etage(s) BF
- Circuits accordés
- 6 Circuits MA (AM)
- Gammes d'ondes
- PO uniquement
- Tension / type courant
- Secteur et Piles (tous types). / 117;4.5;67.5 Volt
- Haut-parleur
- HP dynamique à aimant permanent + bobine mobile
- Matière
- Bakélite ou plastique de type inconnu
- De Radiomuseum.org
- Modèle: B-504 [battery-line operated] - DeWald Radio Mfg. Corp.,
- Forme
- Portative > 20 cm (sans nécessité secteur)
- Remarques
- Built-in loop antenne as first RF circuit. Selenium rectifier.
- Source extérieure
- Ernst Erb
- Source du schéma
- Rider's Perpetual, Volume 18 = 1949 and before
- Schémathèque (1)
- Machine Age to Jet Age II
- Schémathèque (2)
- Table Top Radios Vol. 4 Stein 2003
- Schémathèque (3)
- Plastic Radios - The Antique Radio Collectors' Source Book
- Schémathèque (4)
- Photofact Folder, Howard W. SAMS (Set 43, Date 8/48, Folder 4813-9)
- D'autres Modèles
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Tous les appareils de DeWald Radio Mfg. Corp., Pierce Airo Inc.
Contributions du forum pour ce modèle: DeWald Radio Mfg.: B-504
Discussions: 1 | Publications: 4
Ok, I pretty much a nubie here folks. I did a search on the forum and I did not see a hit, so I started here. I hope this is correct.
I have a few questions on this 1948 DeWald B-504. I know to replace all the capacitors. I laughed when I Googled the two batteries. I got nothing and it said pretty much that.
I just came across this gem and the 4 1/2 volt battery still read 3.5 vdc. Geeze after some 70 years! I believe these two batteries are original. Im sure no one has been in this radio since it was sold in 1948 best I can tell.
First question, should I replace the selenium rectifier? If so, this is done with a diode and a resistor? What values are these? I read somewhere that these gismos can catch fire?
Secondly, I supose I could come up with a power supply to test the batterys that are not available?
Any hints or kinks that anyone may have would be greatly appriciated.
Thanks.....Justin-
Justin McKeever, 15.Feb.24