Pre-war amp, not sure of make

[vintagekiki]

Appreciate, but this field coil wiring would need 4 wires between chassis and speaker assy.

Between chassis and speaker assy there are 4 wires; 2 wires for field coil and 2 wires for OT (compare sch and lay)

[Helmholtz]

VK, you're really eagle-eyed and alert .

So the OP seems to be wrong (or I misinterpreted) about only 3 wires between amp and speaker.

[vintagekiki]

VK, you're really eagle-eyed and alert .

So the OP seems to be wrong (or I misinterpreted) about only 3 wires between amp and speaker.

Thank you

[glebert]

So I managed to get it working first try, i did 19 caps in 3 hours and used my variac to slowly bring her to life. This was pretty straight forward. Its great and fairly quiet from any noise. Definitely sounds good. All 4 inputs work. Will be looking for the matched tube set soon. Oh, and no shocks, just a small soldering burn on my middle finger

Thanks for helping me

Wow, that is like winning the lottery that it worked after just cap replacement. Seems like you did a good job on replacing them if it works so well.

[thelonious_crunk]

Wow, that is like winning the lottery that it worked after just cap replacement. Seems like you did a good job on replacing them if it works so well.

Only thanks to all of the people in this discussion. I know it can be difficult to coach people online. Yes i agree, but i had an idea it would because the original seller said it worked 'not long ago". But we all know how that goes...

[thelonious_crunk]

VK, you're really eagle-eyed and alert .

So the OP seems to be wrong (or I misinterpreted) about only 3 wires between amp and speaker.

Well i see 3 terminals on the speaker, unless one is ground. The speaker connector going from the amp is 4-prong. Either way, you guys helped me stay on the right track with this

[vintagekiki]

About Field Coil Loudspeakers

http://djcarlst.provide.net/FieldCoi.htm
Field Coil Loudspeakers

https://antiqueradios.com/forums/viewtopic.php?t=158496
Field Coil Speakers....

https://ampgarage.com/forum/viewtopic.php?f=11&t=26686
Field Coil Speakers?

https://www.google.com/search?q=rola+site%3Ahttps%3A%2F%2Fwww.kevinchant.com%2F

https://nzvrshome.files.wordpress.com/2018/12/Rola-Catalogue-c1948.pdf

https://patents.google.com/patent/US2770681
Loud-speaker

https://www.google.com/search?q=Field+coil+speaker

[Helmholtz]

Well i see 3 terminals on the speaker, unless one is ground. The speaker connector going from the amp is 4-prong. Either way, you guys helped me stay on the right track with this

No doubt it is a 4-prong/4-pin plug, but the question is: How many wires are actually connecting to the plug?

[thelonious_crunk]

No doubt it is a 4-prong/4-pin plug, but the question is: How many wires are actually connecting to the plug?

I see 4 on the other end as well. I see 3 leads are going to the OT. 1 goes to the speaker terminal. A couple wires also bridge a connection from the OT straight to the speaker terminals.

[vintagekiki]

Please photo your speaker transformer both sides.
The speaker connector is on the bottom of the OT, on the top you see 3 wires of the OT (a1 / + HV / a2) and 1 wire of the field coil.
The other wire of the field coil is connected to the middle terminal of the OT.
On the speaker terminal you have 4 wire (see lay post # 76 and photo #78)

[Enzo]

Possible one side of the OT secondary is soldered direct to the speaker frame, and one side of the voice coil is also.

[thelonious_crunk]

Possible one side of the OT secondary is soldered direct to the speaker frame, and one side of the voice coil is also.

I'm gonna send vintagekiki pics of it when i get home via email since my pics are too large from my phone on here

[Enzo]

Oh, you can just look and tell us whether my notion is right or not.

[thelonious_crunk]

Oh, you can just look and tell us whether my notion is right or not.

Right

[vintagekiki]

I'm gonna send vintagekiki pics of it when i get home via email since my pics are too large from my phone on here

Thank you

1)


2)
Perfect
Pure natural antique clean sound, I haven't heard in a long time.