There is, somewhere on this internet, a table telling the plate impedance of all popular output tubes, and from there you can find the primary impedance of the 6F6 output tube, and a transfommer to match it. I had it but lost it in the great crash of '00 (hard drive) Someone might know where it is.
A 6F6 is a bit of an oddball, no other tube has it's impedance, so the transformer will be harder to find than, say, a 6V6.
As for the choke, it doesn't have to be an exact match, a few Ohms one way or another will not make much difference. Some people replace the choke with a resistor of the same value, but I had rather replace coils with coils and resistors with resistors.
Lewis

::
::
:

Your output transformer for a 6F6 should have a turns ratio of 30:1 and the plate load resistance for a 6F6 should be 7,000 ohms.
John
: There is, somewhere on this internet, a table telling the plate impedance of all popular output tubes, and from there you can find the primary impedance of the 6F6 output tube, and a transfommer to match it. I had it but lost it in the great crash of '00 (hard drive) Someone might know where it is.
: A 6F6 is a bit of an oddball, no other tube has it's impedance, so the transformer will be harder to find than, say, a 6V6.
: As for the choke, it doesn't have to be an exact match, a few Ohms one way or another will not make much difference. Some people replace the choke with a resistor of the same value, but I had rather replace coils with coils and resistors with resistors.
:Lewis
:
:
:::
:::
::
:

Is this the site? http://www.radioremembered.org/outimp.htm

:::I have a Canadian RCA model KL 53, a five-tube AC radio with a 6F6 as an output tube. The original speaker with field coil and output transformer is missing. Can someone advise me on the current rating of filter choke that I should use and also advice on an output transformer? From what I understand, I should pull a transformer from a radio with an output tube with a similar plate resistance?
:::Thanks
:
: There is, somewhere on this internet, a table telling the plate impedance of all popular output tubes, and from there you can find the primary impedance of the 6F6 output tube, and a transfommer to match it. I had it but lost it in the great crash of '00 (hard drive) Someone might know where it is.
: A 6F6 is a bit of an oddball, no other tube has it's impedance, so the transformer will be harder to find than, say, a 6V6.
: As for the choke, it doesn't have to be an exact match, a few Ohms one way or another will not make much difference. Some people replace the choke with a resistor of the same value, but I had rather replace coils with coils and resistors with resistors.
:Lewis
:
:
:::
:::
::
:

Yes, indeeeedy! That should tell you everything you need to know about transfromer matching.....and then some.
Lewis

::
::
:::::I have a Canadian RCA model KL 53, a five-tube AC radio with a 6F6 as an output tube. The original speaker with field coil and output transformer is missing. Can someone advise me on the current rating of filter choke that I should use and also advice on an output transformer? From what I understand, I should pull a transformer from a radio with an output tube with a similar plate resistance?
:::::Thanks
:::
::: There is, somewhere on this internet, a table telling the plate impedance of all popular output tubes, and from there you can find the primary impedance of the 6F6 output tube, and a transfommer to match it. I had it but lost it in the great crash of '00 (hard drive) Someone might know where it is.
::: A 6F6 is a bit of an oddball, no other tube has it's impedance, so the transformer will be harder to find than, say, a 6V6.
::: As for the choke, it doesn't have to be an exact match, a few Ohms one way or another will not make much difference. Some people replace the choke with a resistor of the same value, but I had rather replace coils with coils and resistors with resistors.
:::Lewis
:::
:::
:::::
:::::
::::
:::
::
:

Without a schematic I'd reckon that a 1.0 K 10 watt resistor put somwhere where it could dissipate a little heat would work out fine. You might want to increase the value of the electrolytic capacitor after the choke circuit a little to overcome hum. If it was a 16 mf, replace with a 22 mf for example. In olden times, copper was cheap, electrolytics were expensive.

All other things being equal, you can't get in too much trouble here.

:Lewis,
:
:Is this the site? http://www.radioremembered.org/outimp.htm
:
:
::::I have a Canadian RCA model KL 53, a five-tube AC radio with a 6F6 as an output tube. The original speaker with field coil and output transformer is missing. Can someone advise me on the current rating of filter choke that I should use and also advice on an output transformer? From what I understand, I should pull a transformer from a radio with an output tube with a similar plate resistance?
::::Thanks
::
:: There is, somewhere on this internet, a table telling the plate impedance of all popular output tubes, and from there you can find the primary impedance of the 6F6 output tube, and a transfommer to match it. I had it but lost it in the great crash of '00 (hard drive) Someone might know where it is.
:: A 6F6 is a bit of an oddball, no other tube has it's impedance, so the transformer will be harder to find than, say, a 6V6.
:: As for the choke, it doesn't have to be an exact match, a few Ohms one way or another will not make much difference. Some people replace the choke with a resistor of the same value, but I had rather replace coils with coils and resistors with resistors.
::Lewis
::
::
::::
::::
:::
::
:

It is a very low cost, ( only $1.99 ) neat and simple but very effective circuit that you can use as a substitute for the old field coil.
I've built and used it and it and it works just perfectly!
Parts are cheap and fun to build.

Here's the whole article:
http://www.antiquewireless.org/otb/resto0504.htm

If you choose to use a 500k pot for R-102, be sure to include the 75k ohm resistor in series with it as mentioned in the last sentence of the article
You can build it small and hide it in a little spot or in a cardboard tube under the chassis.