Hello everyone, I'm new here and hope someone can help. I have an old hot point portable 1951it has three batteries and unfortunatly I dont know the battery wiring or voltages. it has one small plug with very close set pins with red /black wire. a second larger plug with wider spaced pins blue/orange. a third set of wires with no plug white/blue. the blue wire on the second and third plug are common. I'm not game to put any voltage to this set as my knowlege is very limited and I dont want to damage the valves. I would be gratefull if someone could explain the colour codeing and what voltages I need. thanks in advance dave.

G'day Dave,

If you are able to help out with a photo of the front and back of the receiver then it may help with identification. You can e-mail any photos to Bradmail.vintage-radio.com.au and I will include them in your post.

Hotpoint receivers were made by AWA on what was supposed to be a brand swapping exercise with AGE and later AEI though the more I think about it, I don't ever recall seeing an AWA toaster or fridge.

Valve line up would be handy also. Check if there is a number on the back. Possibly V55DA as most others that year seem to be vibrator type.

90V & 1.5V filament

Marc

G'day every one, sorry Brad I havnt been able to down load any pics my computer has a mind of its own and needs replaceing, marc the valve line up is1t4, 1rs, 1t4, 1s5, and 3v4. the model no is j75daz the only other no I can find is g0018167 both are stamped on the chasis. are the polarities critical. I'm assuming that because the blue wire is common on two batterys I have to use two 45v batterys in that position. thanks for taking the time to help dave

G'day Dave,

Polarity is definitely critical. Condensers and valves can be damaged if polarity is reversed. One end of the blue wire you mentioned will most likely be soldered to the chassis. If the receiver only requires an A battery and B battery then there should be two other wires, one for the valve heaters and the other for the high tension. There'll be one or two extra wires still if your receiver requires a C battery though C batteries were seldom used in the later years.

"A" battery polarity is also critical as the voltage drop across the filament is part of the bias, in a filament valve.

Marc

G'day folks, there are six wires and all are part of the loom. the red and black will be my 1,5 volts so that only leaves an orange, white and the common blue, I cant find anywhere the common blue will solder to the chasis so I'm certain its to join two 45 volt batteries.if I trace the orange to a cap and check its polarity would that safley give me positive or negative, thanks again for the help dave

I sent Brad a circuit of it. I would strongly advise sitting on your fingers until you get it.

The wire may not go to chassis. I am working on an Astor GP. That also has two 45V batteries in series. It has "back bias" so the negative is floating above chassis by around 6V.

Getting things wrong can do damage.

Marc

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