The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
Jack

Hi Jack

Have you looked at the schematic? Voltages are shown.

http://www.nostalgiaair.org/PagesByModel/982/M0040982.pdf

Several binding posts are tied together because more than one wire connect to these. A+ would also be B-. "A" voltage is for filaments, around 5 1/2 to 6 volts. "B" detector should be lowest plate voltage, usually 22 1/2 to 45 volts. B+ amp would be 67 1/2 to 90 volts. Go by the schematic and you won't have a problem

Norm

:The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
:of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
: both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
:double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
:Jack

Also....I don't know how familiar you are with these early sets....... Be sure that if you aren't using a high impedance speaker (produced back when the set was produced, and ranging from about 300 to 2000 ohms), or a high impedance headphone set (same resistance as above), that you use an appropriate audio output transformer for a modern speaker. If you connect a modern low impedance speaker directly to the headphone jack, it won't work.

Thomas

:Hi Jack
:
: Have you looked at the schematic? Voltages are shown.
:
:http://www.nostalgiaair.org/PagesByModel/982/M0040982.pdf
:
: Several binding posts are tied together because more than one wire connect to these. A+ would also be B-. "A" voltage is for filaments, around 5 1/2 to 6 volts. "B" detector should be lowest plate voltage, usually 22 1/2 to 45 volts. B+ amp would be 67 1/2 to 90 volts. Go by the schematic and you won't have a problem
:
:Norm
:
::The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
::of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
:: both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
::double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
::Jack

Thanks guys, I was alittle unsure about were to connect the B- but should have when I saw the eliminiation of the C voltage was like Crosley did with the Model 51.
thanks again
:Also....I don't know how familiar you are with these early sets....... Be sure that if you aren't using a high impedance speaker (produced back when the set was produced, and ranging from about 300 to 2000 ohms), or a high impedance headphone set (same resistance as above), that you use an appropriate audio output transformer for a modern speaker. If you connect a modern low impedance speaker directly to the headphone jack, it won't work.
:
:Thomas
:
:
:
::Hi Jack
::
:: Have you looked at the schematic? Voltages are shown.
::
::http://www.nostalgiaair.org/PagesByModel/982/M0040982.pdf
::
:: Several binding posts are tied together because more than one wire connect to these. A+ would also be B-. "A" voltage is for filaments, around 5 1/2 to 6 volts. "B" detector should be lowest plate voltage, usually 22 1/2 to 45 volts. B+ amp would be 67 1/2 to 90 volts. Go by the schematic and you won't have a problem
::
::Norm
::
:::The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
:::of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
::: both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
:::double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
:::Jack

I know this is an old subject, but beware of the schematic you will usually find. I think this shows an early version by old Charlie. It seems most sets popping up have no 135V binding post and no C battery posts. There are significantly fewer parts under that chassis than shown on the schematic. Your instruction sheet under the lid will more often than not tell you to use 90V on the final amplifier tube, the post on the extreme right. It will say 45 to 90V may be used on the Detector Tube, which binding post is also marked B+, but the second on far right. I have an early set that has worked fine for four years and am now putting together what I think is a later and simpler set using parts from two with similar chassis. The above specs from the lid paper assume all 01A tubes, not 71A or 112's. I know the 71A operates at the 135V setting. Someone could write a book on the variations encountered in these mid 20's radios.

Enuf rambling. Anyone seen the schematic for the simpler version? Herman

:Thanks guys, I was alittle unsure about were to connect the B- but should have when I saw the eliminiation of the C voltage was like Crosley did with the Model 51.
:thanks again
: :Also....I don't know how familiar you are with these early sets....... Be sure that if you aren't using a high impedance speaker (produced back when the set was produced, and ranging from about 300 to 2000 ohms), or a high impedance headphone set (same resistance as above), that you use an appropriate audio output transformer for a modern speaker. If you connect a modern low impedance speaker directly to the headphone jack, it won't work.
::
::Thomas
::
::
::
:::Hi Jack
:::
::: Have you looked at the schematic? Voltages are shown.
:::
:::http://www.nostalgiaair.org/PagesByModel/982/M0040982.pdf
:::
::: Several binding posts are tied together because more than one wire connect to these. A+ would also be B-. "A" voltage is for filaments, around 5 1/2 to 6 volts. "B" detector should be lowest plate voltage, usually 22 1/2 to 45 volts. B+ amp would be 67 1/2 to 90 volts. Go by the schematic and you won't have a problem
:::
:::Norm
:::
::::The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
::::of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
:::: both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
::::double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
::::Jack

:Hi Jack
:
: Have you looked at the schematic? Voltages are shown.
:
:http://www.nostalgiaair.org/PagesByModel/982/M0040982.pdf
:
: Several binding posts are tied together because more than one wire connect to these. A+ would also be B-. "A" voltage is for filaments, around 5 1/2 to 6 volts. "B" detector should be lowest plate voltage, usually 22 1/2 to 45 volts. B+ amp would be 67 1/2 to 90 volts. Go by the schematic and you won't have a problem
:
:Norm
:
::The binding posts on my masterpiece have me confused as to what Voltage to connect where. Looking from the front
::of the unit from the left the 7 posts are labeled....... 1 aireal 2 gnd 3 A- 4 A+ 5 A+ 6 B+ Det. and 7 B+ Amp
:: both A+' s are tied together as are gnd and A- I thought these were wring but it apears to be original wiring and I
::double checked it against a bottom view picture from another unit and they match. by the way all the schematics I'v seen don't even show the 1/4 inch loud speaker jack. is minecorrect and What power should be put to what post ? thanks
::Jack