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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Vous pourrez trouver sous ce lien 442 modèles d'appareils, 195 avec des images et 344 avec des schémas.
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