1931 Crosley Model 124 Interstage Trannie

7/12/2006 4:11:44 PMJWM

Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?

7/12/2006 4:47:59 PMDoug Criner

RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.

:Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?

7/14/2006 4:43:38 PMJWM

:RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.
:
::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?

Doug, Thank you for your recommendation. I may get this old Crosley talking yet! Jim

7/14/2006 6:08:38 PMEdisonic

:I just finished the restoration of a Crosley 124. I have a couple of good 1930 vintage single plate to Push-Pull pull grid audio transformers that should work in this application, and are of such a size that thewy will easily fit into your chassis. please e-mail if interested. To prevent future burnouts, and improve fidelity it is adviseable to get the DC out of the primary of these interstage units. Just olad the plate of the 224 with a 50-75K resistor, ground one side of the proimary, and couple the other side of the primary to the plate of the 224 through a 1/4 MFD condenser.

:RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.
::
:::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?
:
:Doug, Thank you for your recommendation. I may get this old Crosley talking yet! Jim

7/18/2006 2:13:45 PMJWM

My Crosley 124 has a "27" tube output coupled to one end of the primary of the interstage (that drives the 2 "47"s) through a choke and then coupled to the other end of the primary through a .05 mf cap in series with a potentiometer. This side of the primary also connects to ground through a .1 mf cap. Seems that we have different versions of a Model 124. Thanks for the feedback.

::I just finished the restoration of a Crosley 124. I have a couple of good 1930 vintage single plate to Push-Pull pull grid audio transformers that should work in this application, and are of such a size that thewy will easily fit into your chassis. please e-mail if interested. To prevent future burnouts, and improve fidelity it is adviseable to get the DC out of the primary of these interstage units. Just olad the plate of the 224 with a 50-75K resistor, ground one side of the proimary, and couple the other side of the primary to the plate of the 224 through a 1/4 MFD condenser.
:
::RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.
:::
::::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?
::
::Doug, Thank you for your recommendation. I may get this old Crosley talking yet! Jim

7/18/2006 9:56:47 PMEdisonic

Yes, but the chole is an RF choke and you still have DC flowing through the transformer. I was simply suggesting that if you get the DC out of thr primaty of the audio transformer winding that you cnn greatly increase its longevity, and also imprrove the circuit's fidelity.

:My Crosley 124 has a "27" tube output coupled to one end of the primary of the interstage (that drives the 2 "47"s) through a choke and then coupled to the other end of the primary through a .05 mf cap in series with a potentiometer. This side of the primary also connects to ground through a .1 mf cap. Seems that we have different versions of a Model 124. Thanks for the feedback.
:
:::I just finished the restoration of a Crosley 124. I have a couple of good 1930 vintage single plate to Push-Pull pull grid audio transformers that should work in this application, and are of such a size that thewy will easily fit into your chassis. please e-mail if interested. To prevent future burnouts, and improve fidelity it is adviseable to get the DC out of the primary of these interstage units. Just olad the plate of the 224 with a 50-75K resistor, ground one side of the proimary, and couple the other side of the primary to the plate of the 224 through a 1/4 MFD condenser.
::
:::RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.
::::
:::::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?
:::
:::Doug, Thank you for your recommendation. I may get this old Crosley talking yet! Jim

7/30/2006 11:16:32 PMJWM

:Aha...I see what you mean. Thanks.

:Yes, but the chole is an RF choke and you still have DC flowing through the transformer. I was simply suggesting that if you get the DC out of thr primaty of the audio transformer winding that you cnn greatly increase its longevity, and also imprrove the circuit's fidelity.
:
:
::My Crosley 124 has a "27" tube output coupled to one end of the primary of the interstage (that drives the 2 "47"s) through a choke and then coupled to the other end of the primary through a .05 mf cap in series with a potentiometer. This side of the primary also connects to ground through a .1 mf cap. Seems that we have different versions of a Model 124. Thanks for the feedback.
::
::::I just finished the restoration of a Crosley 124. I have a couple of good 1930 vintage single plate to Push-Pull pull grid audio transformers that should work in this application, and are of such a size that thewy will easily fit into your chassis. please e-mail if interested. To prevent future burnouts, and improve fidelity it is adviseable to get the DC out of the primary of these interstage units. Just olad the plate of the 224 with a 50-75K resistor, ground one side of the proimary, and couple the other side of the primary to the plate of the 224 through a 1/4 MFD condenser.
:::
::::RadioDaze has two xfmrs, either of which should work. I would try HX124A, which is a a 1:3 C.T. audio xfmr.
:::::
::::::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?
::::
::::Doug, Thank you for your recommendation. I may get this old Crosley talking yet! Jim

7/19/2006 2:19:28 PMDave Froehlich

JWM,
This is a common problem with the Crosley 124. I also have one that needs an interstage transformer and I haven't done anything with it for over 10 years. Now that I know where to get a replacement, I will probably finish the electronic restoration. Now I I also know why they had problems. Thanks for posting this question. Thanks to everyone else for the solutions to the problem.

Dave
:Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?

7/30/2006 11:21:07 PMJWM

Glad that you and I can benefit from the collective knowledge here. I have been to a number of forums and this is the one that came to my assistance. Good luck on your restoration. I have a "Music Maker" console that is a great piece of furniture in itself. This will be a bonus to have it actually playing soon.

:JWM,
: This is a common problem with the Crosley 124. I also have one that needs an interstage transformer and I haven't done anything with it for over 10 years. Now that I know where to get a replacement, I will probably finish the electronic restoration. Now I I also know why they had problems. Thanks for posting this question. Thanks to everyone else for the solutions to the problem.
:
:Dave
::Does anyone know the impedance values of the primary and secondary windings of the interstage transformer that drives the two 47s?