SW-3 Questions

[Bill Smith]

Hi Roger,

"Roger D Johnson" > wrote in message
...
> The SW-3 I recently acquired has all sections of the voltage
> divider open! I have the values of the individual sections but
> not sure how they are arranged. It appears that the 6900 Ohm
> section goes to B+ and then thru the 2000 Ohm section and 3100
> Ohms to ground.

That is correct according to a diagram in a James Millen article for the
"All-A.C. Version of the Receiver" QST, unknown date.

>
> My receiver is set up for 2.5 volt filaments and I would like
> to operate it from 6 volts. Half the sites I visit say the 6C6
> is the sub and the other half says 6D6! Which is the better
> choice?

The SW-3 Model II used 58, 58, 56 (2.5 volt) or 6C6, 6C6, 76 (6.3 volt)
tubes interchangeably. This version used "30-40" series coils.

73 de Bill, AB6MT




>
> Thanks and 73, Roger N1RJ
> --
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[Bill Smith]

Hi Roger,

Regarding the tubes, I now see what you mean. The SW-3 here contains 6D6
tubes.

"Roger D Johnson" > wrote in message
...
> The SW-3 I recently acquired has all sections of the voltage
> divider open! I have the values of the individual sections but
> not sure how they are arranged. It appears that the 6900 Ohm
> section goes to B+ and then thru the 2000 Ohm section and 3100
> Ohms to ground.
>
> My receiver is set up for 2.5 volt filaments and I would like
> to operate it from 6 volts. Half the sites I visit say the 6C6
> is the sub and the other half says 6D6! Which is the better
> choice?
>
> Thanks and 73, Roger N1RJ
> --
> Remove tilde (~) to reply
>
> Remember the USS Liberty (AGTR-5)
> http://ussliberty.org/
> _______________________________________________
> National mailing list
>
> http://mailman.qth.net/mailman/listinfo/national
>

[Roger D Johnson]

The SW-3 I recently acquired has all sections of the voltage
divider open! I have the values of the individual sections but
not sure how they are arranged. It appears that the 6900 Ohm
section goes to B+ and then thru the 2000 Ohm section and 3100
Ohms to ground.

My receiver is set up for 2.5 volt filaments and I would like
to operate it from 6 volts. Half the sites I visit say the 6C6
is the sub and the other half says 6D6! Which is the better
choice?

Thanks and 73, Roger N1RJ
--
Remove tilde (~) to reply

Remember the USS Liberty (AGTR-5)
http://ussliberty.org/

[Hagstar]

"Roger D Johnson" > wrote in message
...
> The SW-3 I recently acquired has all sections of the voltage
> divider open! I have the values of the individual sections but
> not sure how they are arranged. It appears that the 6900 Ohm
> section goes to B+ and then thru the 2000 Ohm section and 3100
> Ohms to ground.
>
> My receiver is set up for 2.5 volt filaments and I would like
> to operate it from 6 volts. Half the sites I visit say the 6C6
> is the sub and the other half says 6D6! Which is the better
> choice?


Neither, use a 77 or 78.

John H.

[ken scharf]

Roger D Johnson wrote:
> The SW-3 I recently acquired has all sections of the voltage
> divider open! I have the values of the individual sections but
> not sure how they are arranged. It appears that the 6900 Ohm
> section goes to B+ and then thru the 2000 Ohm section and 3100
> Ohms to ground.
>
> My receiver is set up for 2.5 volt filaments and I would like
> to operate it from 6 volts. Half the sites I visit say the 6C6
> is the sub and the other half says 6D6! Which is the better
> choice?
>
> Thanks and 73, Roger N1RJ
You are correct on the resistor order. This agrees with an SW58
schematic I found.