Hi everyone,

I have a couple of HMV 'Bahama' portable record players from the 1960's. Both of them have speakers blown and require replacements. Given the current speakers are 47 ohm, what would be the suggestion as for a replacement? I have looked wt getting the current ones rebuilt, but due to the odd value, no one can do them ...

Look forward to your assistance.

Cheers
Scott

47 ohms doesn't sound right to me. Are you sure it's not 4.7 ohms?

The only time I have come across 45 ohm speakers is in vintage office intercoms where the speaker doubles as a microphone.

I've seen a 80 ohm speaker in a TV, so 47 might be correct.

Okay, I have found the schematic for model O3-8K and I note that it's a solid state circuit with transformerless output and 47 ohm speakers.

I don't like your chances of finding replacements other than in donor units, if you can find any.

Early transistorised amplifiers often had high impedance speakers.
I even have a radio with a centre tapped voice coil.

I can get, and do have numerous 45 ohm speakers, but they are tiny.
36mm diameter, height 5mm power 0.5W

Wayne.

The speakers were often in the collector of the OP transistor. The only other possible option is likely a transformer.

Marc

Hi guys,

Thanks for the replies thus far. I have just emailed a couple of pics for loading on this topic that may assist. The size of the speakers are 10cm x 17.5cm

Any suggestions on a way to replace them is appreciated - the amp unit is an early simple sold state amp

Cheers
Scott

As Marc suggests, your best option may be to install output transformers in each channel so that you can use speakers with a commonly available impedance such as 8 ohms. Wattage handling is a consideration.

These may be suitable: https://www.edcorusa.com/com50-1

Schematic here: http://www.kevinchant.com/uploads/7/1/0/8/7108231/03-8k_t2-69.pdf

Thats guys, The power handling is very low - I think it's only about 5Watts per channel.

cheers
Scott

Photos uploaded.