Hi,
What's the power rating and impedance of the Hallicrafters S-38A speaker?
What are the primary and secondary impedances of the audio transformer? Are the impedances measured at 1 kHz ?
Can the 50L6GT audio output tube accommodate a range of transformer
primary impedance?
Will the transformer and speaker of any mid-50s AAF work with the 50L6GT ?

Thanks,
Steve Sherman

:Hi,
:What's the power rating and impedance of the Hallicrafters S-38A speaker?
:What are the primary and secondary impedances of the audio transformer? Are the impedances measured at 1 kHz ?
:Can the 50L6GT audio output tube accommodate a range of transformer
:primary impedance?
:Will the transformer and speaker of any mid-50s AAF work with the 50L6GT ?
:
: Thanks,
: Steve Sherman
:
:
:
:
Max 7.5 watts @ 3.2 ohms; 4K ohm and 3.2 ohms; probably, although this is usually not explicitly stated; yes, within reason (-20%/+50%); no, although a majority of them are likely to do so if their output tubes are 50L6s or have similar characteristics.

::Hi,
::What's the power rating and impedance of the Hallicrafters S-38A speaker?
::What are the primary and secondary impedances of the audio transformer? Are the impedances measured at 1 kHz ?
::Can the 50L6GT audio output tube accommodate a range of transformer
::primary impedance?
::Will the transformer and speaker of any mid-50s AAF work with the 50L6GT ?
::
:: Thanks,
:: Steve Sherman
::
::
::
::
:Max 7.5 watts @ 3.2 ohms; 4K ohm and 3.2 ohms; probably, although this is usually not explicitly stated; yes, within reason (-20%/+50%); no, although a majority of them are likely to do so if their output tubes are 50L6s or have similar characteristics.

There are a lot of tubes that match the 50L6's impedance, 50C5 being the first that comes to mind. There was someone earlier this month looking for an output transformer like you are, there is a list of information there from a few days ago.
Lewis
:

CV, Lewis,
Thanks for your help.
I have a number junk radios that I've collected whose parts I'll use to build an S-38'like receiver.
Sure enough, some of the radios have 50L6GTs so I'll salvage the speaker and audio transformer. One of the radios has a 50C5.
Another item - I can't find S-38 inductor or capacitor values for the front end antenna and converter circuitry. Any suggestions?

Thanks Again,
Steve
:::What's the power rating and impedance of the Hallicrafters S-38A speaker?
:::What are the primary and secondary impedances of the audio transformer? Are the impedances measured at 1 kHz ?
:::Can the 50L6GT audio output tube accommodate a range of transformer
:::primary impedance?
:::Will the transformer and speaker of any mid-50s AAF work with the 50L6GT ?
:::
::: Thanks,
::: Steve Sherman
:::
:::
:::
:::
::Max 7.5 watts @ 3.2 ohms; 4K ohm and 3.2 ohms; probably, although this is usually not explicitly stated; yes, within reason (-20%/+50%); no, although a majority of them are likely to do so if their output tubes are 50L6s or have similar characteristics.
:
:There are a lot of tubes that match the 50L6's impedance, 50C5 being the first that comes to mind. There was someone earlier this month looking for an output transformer like you are, there is a list of information there from a few days ago.
:Lewis
::
:
:

:CV, Lewis,
:Thanks for your help.
:I have a number junk radios that I've collected whose parts I'll use to build an S-38'like receiver.
:Sure enough, some of the radios have 50L6GTs so I'll salvage the speaker and audio transformer. One of the radios has a 50C5.
:Another item - I can't find S-38 inductor or capacitor values for the front end antenna and converter circuitry. Any suggestions?
:
: Thanks Again,
: Steve

Guess I don't see the point of such an objective. Why not just find yourself a broken S-38A and restore it? These aren't exactly rare items.

CV,
This is intended as a post-retirement tube tutorial for me. I want to do more than re-cap an S-38.
If I don't die first, I'll try to calculate that that's calculatable.
I'm already looking at half-wave dipole characteristics around 9.5 MHz, a 1:4 transformer to connect to 300 Ohm twin-lead, and a front end coupling circuit.
Linear Technology Corp offers a free circuit simulator, LTspice, that's simple to use. Yes, there's no tube models. But, it may be possible to roll-your-own from the maunfacturer's characteristic curves.
I'll probably have more questions.

Thanks,
Steve
::CV, Lewis,
::Thanks for your help.
::I have a number junk radios that I've collected whose parts I'll use to build an S-38'like receiver.
::Sure enough, some of the radios have 50L6GTs so I'll salvage the speaker and audio transformer. One of the radios has a 50C5.
::Another item - I can't find S-38 inductor or capacitor values for the front end antenna and converter circuitry. Any suggestions?
::
:: Thanks Again,
:: Steve
:
:
:Guess I don't see the point of such an objective. Why not just find yourself a broken S-38A and restore it? These aren't exactly rare items.
: