Post by trombone on Feb 2, 2021 20:08:51 GMT 12
Hullo Everyone, Some of you may have been kind enough to read the blether about 8 track cartridge players and Dremel grinder tools followed by a segue into the saga of this Philips car radio.A huge lump of a radio it lurks near the driver's feet but is told what to do by a couple of Bowden cables and several power cables thick enough to weld with. So , spread out over the bench and provided with volts and amps from the bench supply and several new capacitors and a new resistor in the A.V.C. line it finally offered up some rectified audio modulations .
But actually running on the side contact vibrator supplied as original equipment seemed to be a bridge too far. What then if supplied with a grunty 6.5 volts at 3 amps? Well, the original side contact vibrator buzzed personfully and Jaycar had provided some shiney new buffer caps but the first and original EZ2 rectifier seemed to have a filament - cathode short.A second and the last EZ2 rectifier from the spares box yielded much the same result - no H.T. Was it time to try the solid state option?
A close examination of the markings on one of the inoperative EZ2 rectifiers suggested that it was the equivalent of a 6X5. Which I am lucky enough to have several of in the spares box.So perhaps an adapter is called for .A defunct side contact valve was detached from its glass envelope and wires inserted and soldered in the appropriate contacts in the newly released base .An octal socket was soldered to the wires from the side contact base.That bit sounds glib , but remember that side contact valve bases seemingly are numbered anti clockwise and octals clockwise.
Nah, it wasn't really that hard!And lo and behold , furnished with a new(ish) 6X5 the set initially responded to modulations on the Long Wave band (which I mistook at first for vibrator hash) but once the wave change relay had been energised to click it over to broadcast, rectified audio modulations spread throughout the shed provoking big smiles all round.
And virtually no vibrator hash.
These rectifier problems took me two nights to sort and there are several runs of perished yellow rubber wiring still to replace and then it all has to be put back into the box and I was foolish enough to neglect to take photos as I dismantled it, thinking "I'll be back out here tomorrow, I'll remember how it all goes together".The dates of these entries of these threads will attest to the folly of that particular notion. But , yes, it does now go and rather well too and the little o.c. choke has been replaced by a similarly small but effective item. Would anyone know what the D.C. resistance of such a choke might have been in such a set? And yes, I would still like to find a speaker grille with the Philips emblem on it. Any offers welcome. Cheers everyone.
But actually running on the side contact vibrator supplied as original equipment seemed to be a bridge too far. What then if supplied with a grunty 6.5 volts at 3 amps? Well, the original side contact vibrator buzzed personfully and Jaycar had provided some shiney new buffer caps but the first and original EZ2 rectifier seemed to have a filament - cathode short.A second and the last EZ2 rectifier from the spares box yielded much the same result - no H.T. Was it time to try the solid state option?
A close examination of the markings on one of the inoperative EZ2 rectifiers suggested that it was the equivalent of a 6X5. Which I am lucky enough to have several of in the spares box.So perhaps an adapter is called for .A defunct side contact valve was detached from its glass envelope and wires inserted and soldered in the appropriate contacts in the newly released base .An octal socket was soldered to the wires from the side contact base.That bit sounds glib , but remember that side contact valve bases seemingly are numbered anti clockwise and octals clockwise.
Nah, it wasn't really that hard!And lo and behold , furnished with a new(ish) 6X5 the set initially responded to modulations on the Long Wave band (which I mistook at first for vibrator hash) but once the wave change relay had been energised to click it over to broadcast, rectified audio modulations spread throughout the shed provoking big smiles all round.
And virtually no vibrator hash.
These rectifier problems took me two nights to sort and there are several runs of perished yellow rubber wiring still to replace and then it all has to be put back into the box and I was foolish enough to neglect to take photos as I dismantled it, thinking "I'll be back out here tomorrow, I'll remember how it all goes together".The dates of these entries of these threads will attest to the folly of that particular notion. But , yes, it does now go and rather well too and the little o.c. choke has been replaced by a similarly small but effective item. Would anyone know what the D.C. resistance of such a choke might have been in such a set? And yes, I would still like to find a speaker grille with the Philips emblem on it. Any offers welcome. Cheers everyone.