BX310A (BX310A /00)
Philips; Eindhoven (tubes international!); Miniwatt
- Pays
- Pays-Bas
- Fabricant / Marque
- Philips; Eindhoven (tubes international!); Miniwatt
- Année
- 1951–1953
- Catégorie
- Radio - ou tuner d'après la guerre 1939-45
- Radiomuseum.org ID
- 29832
Gerät eines Sammlerkollegen
Cliquez sur la vignette du schéma pour le demander en tant que document gratuit.
- No. de tubes
- 5
- Principe général
- Super hétérodyne (en général); FI/IF 452 kHz; 2 Etage(s) BF
- Circuits accordés
- 6 Circuits MA (AM)
- Gammes d'ondes
- PO, GO et OC
- Tension / type courant
- Alimentation Courant Alternatif (CA) / 110; 125; 145; 200; 220; 245 Volt
- Haut-parleur
- HP dynamique à aimant permanent + bobine mobile / Ø 15 cm = 5.9 inch
- Puissance de sortie
- 3 W (qualité inconnue)
- Matière
- Boitier en bakélite
- De Radiomuseum.org
- Modèle: BX310A - Philips; Eindhoven tubes
- Forme
- Modèle de table profil bas (grand modèle).
- Dimensions (LHP)
- 380 x 250 x 200 mm / 15 x 9.8 x 7.9 inch
- Remarques
-
AM radio for external antenna:
- LW: 152 - 285 kHz.
- BC: 517 - 1622 kHz.
- SW: 5,92 - 18,2 MHz.
Loudspeaker: 9744X (5Ω).Dial lamp: 8045D (E10, 6,3V/320mA).In versions /53 and /90, there are some slight modifications in the parts but not in the general specifications. See the specific version schematics with this model page.
- Poids net
- 5.9 kg / 12 lb 15.9 oz (12.996 lb)
- Schémathèque (1)
- -- Original-techn. papers.
- Schémathèque (2)
- Dépliant Nouvelle Série Philips Radio 1953, Sept. 1952
- Auteur
- Modèle crée par Iven Müller. Voir les propositions de modification pour les contributeurs supplémentaires.
- D'autres Modèles
-
Vous pourrez trouver sous ce lien 5271 modèles d'appareils, 4415 avec des images et 3457 avec des schémas.
Tous les appareils de Philips; Eindhoven (tubes international!); Miniwatt
Collections
Le modèle fait partie des collections des membres suivants.
Contributions du forum pour ce modèle: Philips; Eindhoven: BX310A
Discussions: 1 | Publications: 6
Hello Forum,
I am restoring a Philips radio type BX310A from 1951/-52. It is generally in quite good shape but has one painful fault; namely internal arcing (= random short circuit) between primary/secondary winding -S23- S24 in the audio output transformer. Trafo's Philips code is A3 152 18.0, and iron core (E+I) size is 40*37*16mm3. Output tube is EL 41 and O/P power 2-3W? The trafo is compact and impregnated with " black tar " so very difficult to open and rewind.
This fault had very interesting symptoms and not so easy to discover. When I smoothly increased AC input voltage by Variac, so around 150V became random "crackle" audible. At the same time one or more arcs happened on tube base socket from anode pin to ground (about 5mm) also a few arcs were visible inside of the tube, especially with higher AC input. These phenomena continued with random rate. Following the anode voltage with oscilloscope showed that the voltage dropped sharply during "crackles". I changed several components and also EL41 + socket at O/P stage without success.
So my final conclusion was a high resistant short circuit between the primary and secondary windings inside of the trafo. One leg of secondary is grounded. Attached drawing shows how I think this phenomenon happens. I also tested the trafo separately with DC voltage and the "crackle " repeated. Normal ohmmeter did not indicate leaking between windings.
Does the arcing happen due to "Spark Coil" effect just like in cars??
Can somebody to advice me are there any means to repair the trafo? Due to trafo construction, rewinding of it look very difficult because of the primary section seems to be top layer. What about availability of adequate replacement trafo (new or surplus)
Best regards
Ake Nyholm
I am restoring a Philips radio type BX310A from 1951/-52. It is generally in quite good shape but has one painful fault; namely internal arcing (= random short circuit) between primary/secondary winding -S23- S24 in the audio output transformer. Trafo's Philips code is A3 152 18.0, and iron core (E+I) size is 40*37*16mm3. Output tube is EL 41 and O/P power 2-3W? The trafo is compact and impregnated with " black tar " so very difficult to open and rewind.
This fault had very interesting symptoms and not so easy to discover. When I smoothly increased AC input voltage by Variac, so around 150V became random "crackle" audible. At the same time one or more arcs happened on tube base socket from anode pin to ground (about 5mm) also a few arcs were visible inside of the tube, especially with higher AC input. These phenomena continued with random rate. Following the anode voltage with oscilloscope showed that the voltage dropped sharply during "crackles". I changed several components and also EL41 + socket at O/P stage without success.
So my final conclusion was a high resistant short circuit between the primary and secondary windings inside of the trafo. One leg of secondary is grounded. Attached drawing shows how I think this phenomenon happens. I also tested the trafo separately with DC voltage and the "crackle " repeated. Normal ohmmeter did not indicate leaking between windings.
Does the arcing happen due to "Spark Coil" effect just like in cars??
Can somebody to advice me are there any means to repair the trafo? Due to trafo construction, rewinding of it look very difficult because of the primary section seems to be top layer. What about availability of adequate replacement trafo (new or surplus)
Best regards
Ake Nyholm
Pièces jointes
- Ph310_audiotrafo-small (149 KB)
- EL41 anodipiiri (18 KB)
Ake Nyholm, 08.Mar.05