[Techlunch] Line speaker transformer

techlunch at happy.emu.id.au techlunch at happy.emu.id.au
Thu Aug 27 18:39:49 EST 2015


Be brave Bill,
If you reckon you have identified the primary, plug it in to 240V measure what volts.
Worst that can happen is a bad small or a bang!!!!!!!!
Cheers
Amanda
PS bring it to lunch tomorrow, someone might recognise it.

Sent from my iPad

> On 26 Aug 2015, at 11:37 pm, techlunch at happy.emu.id.au wrote:
> 
> Rob, Neil, Amanda,
> 
> Thanks for looking all this up.  It looks like they are definitely mains transformers.
> I think I may have picked them up out of a clearance box many (more than 10 ) years ago and always thought they were line transformers !!
> 
> So now what am I going to do with them??
> 
> By the way, does anyone know when Gilbert gets home? I've got a couple of packets of drills here for him, and they're getting boring.
> 
> cheers
> Bill
> 
> 
>> On 26/08/2015 9:55 AM, techlunch at happy.emu.id.au wrote:
>> Bill,
>> M2480 sounds like a mains transformer.
>> 100V line transformer are usually pair of wires on The low Z (8ohms)
>> On the primary three spade terminals marked c  common, 5k/2.5W, 2.5k/5.0W typical.
>> I have only seen wires on both sides of 100V line transformers for high power transformers 30W
>> Plus.
>> Cheers,
>> Amanda
>> 
>> Sent from my iPad
>> 
>>> On 25 Aug 2015, at 9:38 pm, techlunch at happy.emu.id.au wrote:
>>> 
>>> Dear gentle folk,
>>> 
>>> Does anyone have an old (real old) Dick Smith catalogue? You know, the ones that used to have real information in them!!
>>> 
>>> I have a couple of transformers, which I'm pretty sure are 70V/ 100V / 8Ω.  The stock item number is M-2480.
>>> The 8Ω side is obvious, but there are 3 wires on the HV side, so not sure exactly how its configured!!
>>> 
>>> cheers
>>> Bill
>>> 
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