11-15-2011, 04:21 PM
Yup, a 25 cycle power transformer will do just fine at 60 cycles. The reverse is not true, but I don't think any part of the USA or Canada has 25 cycle AC anymore.
Terry - are you saying your 370 speaker has a solid spider like a 20 speaker? I've never seen an original 70, 90 or 370 that had a speaker with a solid spider. Every one I've seen has the open spider that sort of resembles an old 45 rpm adapter in appearance. This was true of all June 1931 and newer Philcos.
The 70 and 90 speakers also have the pressed-in pole piece, as Mark has already pointed out; while the 20 speakers have a nut that holds the pole piece in place. The speakers with the nut holding the pole piece are the ones that have solid spiders. At least, that has held true for every type K speaker I have seen. The K-2 and above have open spiders and pressed-in pole pieces.
Terry - are you saying your 370 speaker has a solid spider like a 20 speaker? I've never seen an original 70, 90 or 370 that had a speaker with a solid spider. Every one I've seen has the open spider that sort of resembles an old 45 rpm adapter in appearance. This was true of all June 1931 and newer Philcos.
The 70 and 90 speakers also have the pressed-in pole piece, as Mark has already pointed out; while the 20 speakers have a nut that holds the pole piece in place. The speakers with the nut holding the pole piece are the ones that have solid spiders. At least, that has held true for every type K speaker I have seen. The K-2 and above have open spiders and pressed-in pole pieces.
--
Ron Ramirez
Ferdinand IN
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
