Stewart Warner Model 300

10/11/2011 4:43:38 PMRob

I have a Stewart Warner Model 300 and would appreciate some assistance in identifying the values of the two capacitors noted in the circuit Can you help

10/11/2011 5:25:13 PMEdd

Sir Rob . . . . .

By its verbiage one might have expected the additional photo of the capacitors in queston . . . . .EXCEPTING . . . . . .the fact that SW 300 model number is going back to circa ~'25 and a mere 2 fixed capacitors DOES constitute its lineage.

The capacitor used for slightly coupling RF into the 1st grid of the detector stage typically is using a "middle of the road " value of 250 mmfd . . . . a silver mica type would be preferrable.

The other cap is at the plate circuitry of the detector and is stripping off, and bypassing to ground, all RF level of that stage, with only the detected audio passing further forward.

I have seen any where from .002 ufd on upwards to .006 used for that units value, with consideration that too HIGH of a capacitance value will be additionally sending your audios higher treble frequencies off to ground also.

A paper - poly or ceramic type will fill in for its type.

If you get all thrugh . . . successfully . . . but also then might also want to experiment further with that unit, do take note of ye old HOT link being placed beee-low :

> > > With specific referencing to its page "twee": < < <

Thassssit . . .

73's de Edd

A day without sunshine is like . . . well . . . night.

:I have a Stewart Warner Model 300 and would appreciate some assistance in identifying the values of the two capacitors noted in the circuit Can you help
:

10/13/2011 5:11:16 PMRob W

:Ed Thanks for that will give it a try However What values are the added resistor "R" and "capacitor C in the revised schematic
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:Sir Rob . . . . .
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:By its verbiage one might have expected the additional photo of the capacitors in queston . . . . .EXCEPTING . . . . . .the fact that SW 300 model number is going back to circa ~'25 and a mere 2 fixed capacitors DOES constitute its lineage.
:
:
:The capacitor used for slightly coupling RF into the 1st grid of the detector stage typically is using a "middle of the road " value of 250 mmfd . . . . a silver mica type would be preferrable.
:
:
:The other cap is at the plate circuitry of the detector and is stripping off, and bypassing to ground, all RF level of that stage, with only the detected audio passing further forward.
:
:
:I have seen any where from .002 ufd on upwards to .006 used for that units value, with consideration that too HIGH of a capacitance value will be additionally sending your audios higher treble frequencies off to ground also.
:
:
:A paper - poly or ceramic type will fill in for its type.
:
:
:
:If you get all thrugh . . . successfully . . . but also then might also want to experiment further with that unit, do take note of ye old HOT link being placed beee-low :
:
:
:
:
:
:> > > With specific referencing to its page "twee": < < <
:
:
:
:
:
:Thassssit . . .
:
:
:
:73's de Edd
:
:
:
:
:A day without sunshine is like . . . well . . . night.
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:
:
:

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::I have a Stewart Warner Model 300 and would appreciate some assistance in identifying the values of the two capacitors noted in the circuit Can you help
::
:
:

10/13/2011 10:48:12 PMEdd

Sir Rob Dub-l-yah . . . . .

The " NEW " R and C items would be the voltage dropping resistor for the screen supplies of the new tubes and their common B+ decoupling capacitor.

Since we are using such a relatively low B+ level to begin with, a 4.7 K would be in order for the resistor and .05 or .1 ufd for the capacitors value .

If experiencing too much gain or any instability, the R value could be also additionally evaluated on up at a 10-25 k value, and /or additionally placing a bypass cap right at each tubes screen connection at the socket . . . to a close ground .

73's de Edd

Viagara . . . . . .

( THE secret ingredients in its formulation )

3% Vitamin E

2% Aspirin

2% Ibuprofen

1% Vitamin C

5% Spray Starch

87% Fix-A-Flat

::Ed Thanks for that will give it a try However What values are the added resistor "R" and "capacitor C in the revised schematic
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::Sir Rob . . . . .
::
::
::By its verbiage one might have expected the additional photo of the capacitors in queston . . . . .EXCEPTING . . . . . .the fact that SW 300 model number is going back to circa ~'25 and a mere 2 fixed capacitors DOES constitute its lineage.
::
::
::The capacitor used for slightly coupling RF into the 1st grid of the detector stage typically is using a "middle of the road " value of 250 mmfd . . . . a silver mica type would be preferrable.
::
::
::The other cap is at the plate circuitry of the detector and is stripping off, and bypassing to ground, all RF level of that stage, with only the detected audio passing further forward.
::
::
::I have seen any where from .002 ufd on upwards to .006 used for that units value, with consideration that too HIGH of a capacitance value will be additionally sending your audios higher treble frequencies off to ground also.
::
::
::A paper - poly or ceramic type will fill in for its type.
::
::
::
::If you get all thrugh . . . successfully . . . but also then might also want to experiment further with that unit, do take note of ye old HOT link being placed beee-low :
::
::
::
::
::
::> > > With specific referencing to its page "twee": < < <
::
::
::
::
::
::Thassssit . . .
::
::
::
::73's de Edd
::
::
::
::
::A day without sunshine is like . . . well . . . night.
::
::
::
::

::

::
::
::
::
::
::
::
:::I have a Stewart Warner Model 300 and would appreciate some assistance in identifying the values of the two capacitors noted in the circuit Can you help
:::
::
::
:
: