stewart warner mod 300 ARBE111 hookup

1/6/2010 3:45:37 PMRob

Would like to know how to hookup an Arbeiii battery eliminator to a stewart warner model 300

1/7/2010 1:00:08 AMEdd

Sir Rob . . . . . .

Looks like that the 300 unit only needs the hook up as is being shown to the Arby Burger III as is shown below in the reference, in addition
to the Aerial and Ground and two leads to the speaker.

73's de Edd

1/8/2010 2:33:23 PMRob

: Ed Thanks for that.. I tried it with no result Have checked Tubes all Ok Voltages Ok and audio interstage trans.. I have another version of hookup which indicates a -4.5 V wire from arbee to radio but no indication of where/how to tap into the radio can you help
:
:
:
:Sir Rob . . . . . .
:
:
:
:Looks like that the 300 unit only needs the hook up as is being shown to the Arby Burger III as is shown below in the reference, in addition
:to the Aerial and Ground and two leads to the speaker.
:
:

:
:
:
:
:
:73's de Edd
:
:
:

:
:
:

1/8/2010 7:43:05 PMEd Kraushar(83077:83052)

:: Ed Thanks for that.. I tried it with no result Have checked Tubes all Ok Voltages Ok and audio interstage trans.. I have another version of hookup which indicates a -4.5 V wire from arbee to radio but no indication of where/how to tap into the radio can you help
::

Hi,
Your model 300 does not require the C battery hook up. Later Stewart Warner models in the 305 up range did.
Have you checked the grid leak resistor. Around 2 megohms should be fine, the old originals go up in value or may be open. You can temporarily sub in a regular resistor for testing. Also make sure that the RF coils are not open. The by-pass cap on the primary of the first audio interstage transformer can also be a problem. Did you check the voltages at the tube sockets or just at the radio terminals?
Ed.

1/10/2010 7:28:50 AMEdd(83143:83077)

Sir Rob . . . . . .

With your info on the tubes condition and the presence of B+ on all of the tubes plates, lets try this.

Initially, there is the audio amplifier aspect on the receivers tail end and the division point, being at the detector tube of the prior frontal RF amplifier sections.

To get some brute force check on the AF aspect, lets take a 1 k resistor and a clip lead and connect one of its lead ends to ground and take the free end of the resistor and treat it like a match.

Initially scope out your involved test points . . .the plate connections of the detector, driver and af output plate connecions of those three tubes.

Then you rapidly . . . 5 ---- 7 14/68ths milliseconds . . ."strike " the resistor lead to the plate of the AF output to see if the speaker crackles for you. If so . . .goooood . . .then move to the plate of the driver and expect the same but a wee bit louder. If fine so far, then move to the plate of the detector and expect the loudest response yet.

If all is well to this point , place a wet fingertip to the first grid of the dector tube and expect your floating body to induce 60~hum pickup from house AC wiring into that grid, to then be amplified from the three following stages and an expected hum coming from the sets speaker.
If all is well then, and Sir Ed's suspect of an "opened" grid leak resistor proves to not be the fault.
Then consider the frontal RF stages, if all RF coils / transformers are showing continuity.

If you now have a healthy ground and aerial connected up to the set, a quick analysis can be made with a plastic, shirt pocket sized, transistom-o-ferized ray-dee-oh.

Locate the bottom of chassis exposed wiring to the plates of the frontal RF amplifiers and tune the
XSTR radio to one of the STRONGER stations and nestle its internal ferri-loop antnenna up near the plate wiring of the first RF amp and see if the tuning in of the problem receiver to that same frequency doesn't enhance the reception of the host test receiver. If so move on to the sampling of the wiring of the 2nd RF amp tube circuitry where the amplifying effect should be even more noticable.

If recepton is well on both stages plate positions , move the tuning of the xstr to a weakly received station, and this time at the 2nd RF amps plate there should be a real enhancement of reception in the tuning in of the main receiver to that weaker new frequency on the host XSTR radio.

If / when both of these testing modes pan out . . . you should have one Oh-fish-ully working receiver.

As per your query on the power wiring . . .to the Arby Burger III, if your set does not have another
floating loose wire for C battery operation, the supplied data is correct.

EXPLANATION:

As shown, NOTE that the B- lead is connecting to NOT the A- lead , but instead , to the A+ lead, so that there is the presence of -6Vdc at the A- lead, with it THEN being referenced against the A+ and B- common connections.

Therefore, -6VDC is being supplied up to the 1st grid circuitry of both the driver and the AF output tubes for fulfilling their negative "C" biasing requirements.

Standing by . . . . .

73's de Edd

1/10/2010 3:22:32 PMRob(83169:83143)

Ed Many many thanks for all that info..Will commence testing.. One other question is what value are the caps..2 of ..They are near impossible to identify.. Rob W
:
:
:
:Sir Rob . . . . . .
:
:
:
:
:With your info on the tubes condition and the presence of B+ on all of the tubes plates, lets try this.
:
:
:Initially, there is the audio amplifier aspect on the receivers tail end and the division point, being at the detector tube of the prior frontal RF amplifier sections.
:
:
:To get some brute force check on the AF aspect, lets take a 1 k resistor and a clip lead and connect one of its lead ends to ground and take the free end of the resistor and treat it like a match.
:
:
:Initially scope out your involved test points . . .the plate connections of the detector, driver and af output plate connecions of those three tubes.
:
:
:Then you rapidly . . . 5 ---- 7 14/68ths milliseconds . . ."strike " the resistor lead to the plate of the AF output to see if the speaker crackles for you. If so . . .goooood . . .then move to the plate of the driver and expect the same but a wee bit louder. If fine so far, then move to the plate of the detector and expect the loudest response yet.
:
:
:If all is well to this point , place a wet fingertip to the first grid of the dector tube and expect your floating body to induce 60~hum pickup from house AC wiring into that grid, to then be amplified from the three following stages and an expected hum coming from the sets speaker.
:
:
:
:If all is well then, and Sir Ed's suspect of an "opened" grid leak resistor proves to not be the fault.
:Then consider the frontal RF stages, if all RF coils / transformers are showing continuity.
:
:
:If you now have a healthy ground and aerial connected up to the set, a quick analysis can be made with a plastic, shirt pocket sized, transistom-o-ferized ray-dee-oh.
:
:
:Locate the bottom of chassis exposed wiring to the plates of the frontal RF amplifiers and tune the
:XSTR radio to one of the STRONGER stations and nestle its internal ferri-loop antnenna up near the plate wiring of the first RF amp and see if the tuning in of the problem receiver to that same frequency doesn't enhance the reception of the host test receiver. If so move on to the sampling of the wiring of the 2nd RF amp tube circuitry where the amplifying effect should be even more noticable.
:
:
:If recepton is well on both stages plate positions , move the tuning of the xstr to a weakly received station, and this time at the 2nd RF amps plate there should be a real enhancement of reception in the tuning in of the main receiver to that weaker new frequency on the host XSTR radio.
:
:
:If / when both of these testing modes pan out . . . you should have one Oh-fish-ully working receiver.
:
:
:
:As per your query on the power wiring . . .to the Arby Burger III, if your set does not have another
:floating loose wire for C battery operation, the supplied data is correct.
:
:
:EXPLANATION:
:
:
:As shown, NOTE that the B- lead is connecting to NOT the A- lead , but instead , to the A+ lead, so that there is the presence of -6Vdc at the A- lead, with it THEN being referenced against the A+ and B- common connections.
:
:
:Therefore, -6VDC is being supplied up to the 1st grid circuitry of both the driver and the AF output tubes for fulfilling their negative "C" biasing requirements.
:
:
:Standing by . . . . .
:
:
:
:
:
:73's de Edd
:
:
:

:
:
:

1/13/2010 11:04:44 PMRob(83273:83143)

Ed WE HAVE LIFT OFF... The S>W> is a goer. Many many thanks for your invaluable info..Rob W
:
:
:Sir Rob . . . . . .
:
:
:
:
:With your info on the tubes condition and the presence of B+ on all of the tubes plates, lets try this.
:
:
:Initially, there is the audio amplifier aspect on the receivers tail end and the division point, being at the detector tube of the prior frontal RF amplifier sections.
:
:
:To get some brute force check on the AF aspect, lets take a 1 k resistor and a clip lead and connect one of its lead ends to ground and take the free end of the resistor and treat it like a match.
:
:
:Initially scope out your involved test points . . .the plate connections of the detector, driver and af output plate connecions of those three tubes.
:
:
:Then you rapidly . . . 5 ---- 7 14/68ths milliseconds . . ."strike " the resistor lead to the plate of the AF output to see if the speaker crackles for you. If so . . .goooood . . .then move to the plate of the driver and expect the same but a wee bit louder. If fine so far, then move to the plate of the detector and expect the loudest response yet.
:
:
:If all is well to this point , place a wet fingertip to the first grid of the dector tube and expect your floating body to induce 60~hum pickup from house AC wiring into that grid, to then be amplified from the three following stages and an expected hum coming from the sets speaker.
:
:
:
:If all is well then, and Sir Ed's suspect of an "opened" grid leak resistor proves to not be the fault.
:Then consider the frontal RF stages, if all RF coils / transformers are showing continuity.
:
:
:If you now have a healthy ground and aerial connected up to the set, a quick analysis can be made with a plastic, shirt pocket sized, transistom-o-ferized ray-dee-oh.
:
:
:Locate the bottom of chassis exposed wiring to the plates of the frontal RF amplifiers and tune the
:XSTR radio to one of the STRONGER stations and nestle its internal ferri-loop antnenna up near the plate wiring of the first RF amp and see if the tuning in of the problem receiver to that same frequency doesn't enhance the reception of the host test receiver. If so move on to the sampling of the wiring of the 2nd RF amp tube circuitry where the amplifying effect should be even more noticable.
:
:
:If recepton is well on both stages plate positions , move the tuning of the xstr to a weakly received station, and this time at the 2nd RF amps plate there should be a real enhancement of reception in the tuning in of the main receiver to that weaker new frequency on the host XSTR radio.
:
:
:If / when both of these testing modes pan out . . . you should have one Oh-fish-ully working receiver.
:
:
:
:As per your query on the power wiring . . .to the Arby Burger III, if your set does not have another
:floating loose wire for C battery operation, the supplied data is correct.
:
:
:EXPLANATION:
:
:
:As shown, NOTE that the B- lead is connecting to NOT the A- lead , but instead , to the A+ lead, so that there is the presence of -6Vdc at the A- lead, with it THEN being referenced against the A+ and B- common connections.
:
:
:Therefore, -6VDC is being supplied up to the 1st grid circuitry of both the driver and the AF output tubes for fulfilling their negative "C" biasing requirements.
:
:
:Standing by . . . . .
:
:
:
:
:
:73's de Edd
:
:
:

:
:
: