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Année: 1954/1955 | Catégorie: Radio - ou tuner d'après la guerre 1939-45 | ||||
Lampes / Tubes | 6: DF96 DK92 DF96 DAF96 DM71 DL94 | ||||
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Semi-conducteurs (seuls les transistors sont comptés) | Selen |
Principe général | Super hétérodyne avec étage HF; FI/IF 452 kHz; 2 Etage(s) BF |
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Circuits accordés | 6 Circuits MA (AM) |
Gammes d'ondes | OM (PO), et 2 x OC. |
Particularités | |
Tension / type courant | Secteur et Piles (tous types). / AC 110; 150; 220 / 2 x 1,5 & 2 x 67,5 Volt |
Haut-parleur | HP dynamique à aimant permanent (bobine mobile) / Ø 5 inch = 12.7 cm |
Puissance de sortie | |
De Radiomuseum.org | Modèle: LX437AB - Philips; Eindhoven tubes |
Matière | Boitier en bakélite |
Forme | Portative > 20 cm (sans la nécessité d'un réseau) |
Dimensions (LHP) | 260 x 250 x 120 mm / 10.2 x 9.8 x 4.7 inch |
Remarques | The Philips receiver LX437AB features a tuned rf preamplifier with aperiodic coupling to the mixer stage. Power consumption from AC mains: 17W. Selenium rectifier bridge. |
Prix de mise sur le marché | 1'950.00 PTE |
Littérature | -- Original prospect or advert |
Schémathèque (1) | -- Original-techn. papers. |
Modèle crée par Mario Coelho. Voir les propositions de modification pour les contributeurs supplémentaires.
Tous les appareils de Philips; Eindhoven (tubes international!); Miniwatt
Vous pourrez trouver sous ce lien 4981 modèles d'appareils, 4169 avec des images et 3324 avec des schémas.
Vus: 1972 Répondre: 2
Philips LX 437 AB
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Antonio Barros-Regada
21.Dec.13 |
1
May I wish to all members and their families a Merry Christmas and a Happy new Year with greetings from our Sunny Algarve! |
Michael Watterson
21.Dec.13 |
2
In generalIf the pin 1 & pin 7 is in parallel for all except output (Here DL94), and it has 1 & 7 tied together then it's 1.4V filament and the two 1.5V batteries are in parallel. The alternative is usually all filaments in sieres, but that's unlikely as the DL94 is 100mA 1.4V parallel and 50mA 2.7V Series. Examining the LI437AB (which is alleged to be the same), suggests the 2 x 1.5V cells are in series. This does NOT mean 3V of mains. This is because a pair of 1.5V batteries are nominally 3.4V to 3.2V (new, no load to near dead).
Recommended voltage is actually 1.35V per filament for good life. Between 1.28 and 1.39V is fine. So on mains your filament volts should be 2.56 to 2.78V if the battery connections simply switched to mains PSU. But they are not. On Battery (Nominal 2.8V 125mA) DK92 (V2 50mA) in series with ( DAF96 and DM71 each 25mA) DF96 (V1 RF ) in series with DF96 (V3 IF) 25mA DL94 in series mode, 2 x 50mA On Mains On this set the LT on mains is via 1.6K and adjustable 600 Ohms from the HT rail. The switch is shown in mains position, so V1 pin is no longer the Battery +. All current is via V5, DL94, so 50mA Series. DK92 (50mA) is to 0V, so is end of "chain". V4 DAF96 and V7 DM71 are still in parallel (25mA + 25mA), but the 2 x DF96 are switched from series 25mA 2.8V to parallel 50mA. So we have at 1.35V per filament (Series mode), Logically (BUT NOT How it's done!)
DL94 = 2.7 This is not a very happy design on mains! The total from slider of 600 Ohms (pin7 DL94) to Chassis (Pin 1 DK92) would be 6.75 nominal. The reasonable range is 6.3V at lowest mains voltage to 6.9V at highest mains voltage. However it looks like the two DF96 remain in series on Mains! How it really worksLX444 seems to be similar (Battery)
On Mains the LX444 is given
So in this case R37 has about 23mA and 2.7V. On the LI437 I think 120 Ohms, which is 22.5mA at 2.7V on DF96 filaments in series. R21 is to balance the 6mA or so HT current. ConclusionOn battery the nominal supply is 2.8V 125mA. On Mains the nominal supply about 48mA nominal 8V (6 filaments in series) or about 7,7V to 8.3V at extreme limits of AC mains voltage variation. As if the design originally had DF91 x2 , DAF91 and no DM71 instead of DF96 x 2, DAF96 and DM71, To test and align such Mains PSUs I use dummy valves (tubes) with resistors for simulation of filaments AND resistors form g2 and Anode to EACH filament pin to simulate total HT current which adds to the filament currents. This is why there are additional resistors in the filament circuit. They are to balance the HT currents which vary between nearly 7mA per tube to under 500uA (DAF96, DM71), |
Heribert Jung
21.Dec.13 |
3
Hi Antonio, I uploaded the schema and all original Philips infos. There is a separate schema of Hf-wiring for all 3 wave-rages and a page with power-supply wiring and a voltage chart. |