Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Cabinets-Speakers => Topic started by: TIMBO on October 03, 2015, 05:45:48 pm

Title: Field Coil Speakers
Post by: TIMBO on October 03, 2015, 05:45:48 pm

Hi guys, Just thought I would throw this out there to find some more info on these speakers.
They need to connect to this http://el34world.com/Forum/index.php?topic=19150.0 (http://el34world.com/Forum/index.php?topic=19150.0)
From what info I have I think I may need two speakers one with a 5000 ohm field coil and the other with a 250 ohm.
The 250 ohm I think is being used as a CHOKE connecting the B+ to the OT CT.
Seems that here in Australia we have a VERY limited supply of these speakers and I am bidding on this http://www.ebay.com.au/itm/Rola-12-speaker-field-coil-electro-magnetic-/191701048468?hash=item2ca245dc94 (http://www.ebay.com.au/itm/Rola-12-speaker-field-coil-electro-magnetic-/191701048468?hash=item2ca245dc94) as it is the only one I can find  :sad2:

Title: Re: Field Coil Speakers
Post by: eleventeen on October 04, 2015, 11:48:00 am

I would not be happy buying stuff like that. If you need authenticity, then I guess you do. I can't see spending money on such a fragile old thing that you could burn out in ten seconds of use.

Title: Re: Field Coil Speakers
Post by: TIMBO on October 04, 2015, 03:22:49 pm

Hey mate, Just don't know enough about this stuff, the DOES and the DON'Ts