I've built a two-tube regen (the second stage is an audio amp).
The detector stage has a 33k plate load resistor which drops 50v from a
90v supply. I'd like to try for more detector stage gain by using an AF choke.
An example of such an arrangement can be seen in an RCA Receiving Tube Manual, "Battery-Operated Short-Wave Receiver", in which a 300-500H AF choke is used.
I see new 150H inductors priced around $17.00 from Mouser and Digikey.
Can I find something used and cheaper? Do junk radios from a particular era use large-value AF chokes?

Thanks,
Steve

:I've built a two-tube regen (the second stage is an audio amp).
:The detector stage has a 33k plate load resistor which drops 50v from a
:90v supply. I'd like to try for more detector stage gain by using an AF choke.
:An example of such an arrangement can be seen in an RCA Receiving Tube Manual, "Battery-Operated Short-Wave Receiver", in which a 300-500H AF choke is used.
:I see new 150H inductors priced around $17.00 from Mouser and Digikey.
:Can I find something used and cheaper? Do junk radios from a particular era use large-value AF chokes?
:
: Thanks,
: Steve
:
Ooops. I misspoke.
On the RCA receiver, its probably the R3=0.25 meg, mostly, that sets the gain of the detector stage. But the AF choke enables the use of such a
large load resistor.

Thanks,
Steve

Steve

Why not use an audio interstage transformer like Stancor A53. It will give you the inductance and gain by turns ratio.

Norm

:

:I've built a two-tube regen (the second stage is an audio amp).
::The detector stage has a 33k plate load resistor which drops 50v from a
::90v supply. I'd like to try for more detector stage gain by using an AF choke.
::An example of such an arrangement can be seen in an RCA Receiving Tube Manual, "Battery-Operated Short-Wave Receiver", in which a 300-500H AF choke is used.
::I see new 150H inductors priced around $17.00 from Mouser and Digikey.
::Can I find something used and cheaper? Do junk radios from a particular era use large-value AF chokes?
::
:: Thanks,
:: Steve
::
:Ooops. I misspoke.
:On the RCA receiver, its probably the R3=0.25 meg, mostly, that sets the gain of the detector stage. But the AF choke enables the use of such a
:large load resistor.
:
: Thanks,
: Steve
:

:Steve
:
: Why not use an audio interstage transformer like Stancor A53. It will give you the inductance and gain by turns ratio.
:
:Norm
:
Norm,
Yes. I found regen schematics that have the interstage transformer.
I'll check out A53.
Thanks for the suggestion.

Steve
:
:
::I've built a two-tube regen (the second stage is an audio amp).
:::The detector stage has a 33k plate load resistor which drops 50v from a
:::90v supply. I'd like to try for more detector stage gain by using an AF choke.
:::An example of such an arrangement can be seen in an RCA Receiving Tube Manual, "Battery-Operated Short-Wave Receiver", in which a 300-500H AF choke is used.
:::I see new 150H inductors priced around $17.00 from Mouser and Digikey.
:::Can I find something used and cheaper? Do junk radios from a particular era use large-value AF chokes?
:::
::: Thanks,
::: Steve
:::
::Ooops. I misspoke.
::On the RCA receiver, its probably the R3=0.25 meg, mostly, that sets the gain of the detector stage. But the AF choke enables the use of such a
::large load resistor.
::
:: Thanks,
:: Steve
::
:
: