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 Electro Dynamic Speakers
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 Return to top of page · Post #: 1 · Written at 12:12:23 PM on 28 January 2023.
Arty41's Gravatar
 Arty41
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 102
 Postcount: 301

Would anyone have either an 8 - 10 or 12 inch speaker with a 2K field coil for sale ?
I checked my stock and found a Rola F12 with a field coil of 7500 ohm field coil, would anyone know what radio it was used in? There is no further information on Radio Museum or Kevin Chants site

Thanks

Rola loadspeaker
Rola loadspeaker
Rola loadspeaker
 
 Return to top of page · Post #: 2 · Written at 12:26:52 AM on 29 January 2023.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5257

My common option is to get a 2K panel mount resistor of around ten watts and use a conventional speaker. I have possibly got one but freight may be interesting due to the weight.

Examples of panel mount resistors https://au.rs-online.com/web/c/passive-components/fixed-resistors/chassis-mount-resistors/

Marc
 
 Return to top of page · Post #: 3 · Written at 2:18:45 PM on 29 January 2023.
Arty41's Gravatar
 Arty41
 Location: Brisbane, QLD
 Member since 18 September 2010
 Member #: 102
 Postcount: 301

Hi Marc, Thanks for your offer and suggestion, I've actually got it connected in the manner you suggested. A couple of years ago I bought quite a few 100 watt resistors with built in heat sink of various values. I used a 1500 ohm in series with a filter choke, it works well with no hum. I just wanted to keep it authentic, that's all.
This not where I bought them from, just an example what they look like. On E-bay item number. 265776783949
RT
 
 Return to top of page · Post #: 4 · Written at 9:57:56 PM on 29 January 2023.
Brad's avatar
 Brad
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7307

Photos uploaded.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 5 · Written at 2:17:22 AM on 30 January 2023.
Marcc's avatar
 Marcc
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5257

A field like that is more likely parallel with the "B" rail, or just feeding the RF. May also be out of an amplifier.

Marc
 
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