Thanks
You can leave out transformer #2. This only couples audio to tube #4. Be sure you have plate voltage to tube #2. It could be missing when transformer #2 if left out.
http://www.nostalgiaair.org/PagesByModel/961/M0039961.pdf
Reflex circuits can be tricky. Tube #2 is used twice, Once for RF then again for audio. I don't see any regen in this radio so may not go into oscillation.
Norm
:Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
:
:Thanks
The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
Doug
:Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
:
:Thanks
The Choke Coil is a goner...necessary in your eyes?
:Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
:
:The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
:
:A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
:Doug
:
:
::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
::
::Thanks
Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
Are you using a ground connection? That is necessary.
Doug
:Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
:
:The Choke Coil is a goner...necessary in your eyes?
:
::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
::
::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
::
::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
::Doug
::
::
:::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
:::
:::Thanks
That choke is necessary. Without it plate of tube #1 is tied directly to B+, 90 volts. Use a 2.5mh choke or 10-22K resistor in it's place.
This may be the reason you don't have much of a signal?
Norm
:OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
:
:Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
:
:Are you using a ground connection? That is necessary.
:Doug
:
::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
::
::The Choke Coil is a goner...necessary in your eyes?
::
:::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
:::
:::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
:::
:::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
:::Doug
:::
:::
::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
::::
::::Thanks
Norm, why isn't B+ connected through the primary of the RF xfmr rather than through the choke? And then eliminate the choke?
Doug
:Dave
:
: That choke is necessary. Without it plate of tube #1 is tied directly to B+, 90 volts. Use a 2.5mh choke or 10-22K resistor in it's place.
:
: This may be the reason you don't have much of a signal?
:
:Norm
:
:
::OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
::
::Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
::
::Are you using a ground connection? That is necessary.
::Doug
::
:::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
:::
:::The Choke Coil is a goner...necessary in your eyes?
:::
::::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
::::
::::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
::::
::::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
::::Doug
::::
::::
:::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
:::::
:::::Thanks
I would have done like you suggest. Eliminate the choke and connect primary of the coil to the plate. Other end of the coil to B+.
Noticed another thing.. Number 2 RF transformer has an arrow on the schematic. This coil must be adjustable?
Norm
:Saved by Norm, again. Yeah, without that choke, that first stage won't work very well, strapped to B+.
:
:Norm, why isn't B+ connected through the primary of the RF xfmr rather than through the choke? And then eliminate the choke?
:Doug
:
::Dave
::
:: That choke is necessary. Without it plate of tube #1 is tied directly to B+, 90 volts. Use a 2.5mh choke or 10-22K resistor in it's place.
::
:: This may be the reason you don't have much of a signal?
::
::Norm
::
::
:::OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
:::
:::Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
:::
:::Are you using a ground connection? That is necessary.
:::Doug
:::
::::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
::::
::::The Choke Coil is a goner...necessary in your eyes?
::::
:::::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
:::::
:::::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
:::::
:::::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
:::::Doug
:::::
:::::
::::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
::::::
::::::Thanks
:Doug
:
: I would have done like you suggest. Eliminate the choke and connect primary of the coil to the plate. Other end of the coil to B+.
:
: Noticed another thing.. Number 2 RF transformer has an arrow on the schematic. This coil must be adjustable?
:
:Norm
:
::Saved by Norm, again. Yeah, without that choke, that first stage won't work very well, strapped to B+.
::
::Norm, why isn't B+ connected through the primary of the RF xfmr rather than through the choke? And then eliminate the choke?
::Doug
::
:::Dave
:::
::: That choke is necessary. Without it plate of tube #1 is tied directly to B+, 90 volts. Use a 2.5mh choke or 10-22K resistor in it's place.
:::
::: This may be the reason you don't have much of a signal?
:::
:::Norm
:::
:::
::::OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
::::
::::Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
::::
::::Are you using a ground connection? That is necessary.
::::Doug
::::
:::::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
:::::
:::::The Choke Coil is a goner...necessary in your eyes?
:::::
::::::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
::::::
::::::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
::::::
::::::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
::::::Doug
::::::
::::::
:::::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
:::::::
:::::::Thanks
Thanks Norm and Doug! Jumping that choke with a resistor put life into this old set like nothing before! I think I may try rewinding old choke if I get time...take a couple of days off with pay!
:Norm, that was more of my original thought...eliminating the choke. No, the second RF xfmr isn't adjustable. It's a coil on form inside another coil on form with TIGHT spacing and the hardware is not adjustable (unless they "set" it up at the factory and then made it unadjustable (as RF#1 is a variometer type).
:
::Doug
::
:: I would have done like you suggest. Eliminate the choke and connect primary of the coil to the plate. Other end of the coil to B+.
::
:: Noticed another thing.. Number 2 RF transformer has an arrow on the schematic. This coil must be adjustable?
::
::Norm
::
:::Saved by Norm, again. Yeah, without that choke, that first stage won't work very well, strapped to B+.
:::
:::Norm, why isn't B+ connected through the primary of the RF xfmr rather than through the choke? And then eliminate the choke?
:::Doug
:::
::::Dave
::::
:::: That choke is necessary. Without it plate of tube #1 is tied directly to B+, 90 volts. Use a 2.5mh choke or 10-22K resistor in it's place.
::::
:::: This may be the reason you don't have much of a signal?
::::
::::Norm
::::
::::
:::::OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
:::::
:::::Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
:::::
:::::Are you using a ground connection? That is necessary.
:::::Doug
:::::
::::::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
::::::
::::::The Choke Coil is a goner...necessary in your eyes?
::::::
:::::::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
:::::::
:::::::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
:::::::
:::::::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
:::::::Doug
:::::::
:::::::
::::::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
::::::::
::::::::Thanks
I have it grounded. No I didn't jumper choke - I left it open - I should add cap and short over open choke?
:OK, I'm looking at the "choke coil" in the B+ line to Tube #1. I think the purpose of that coil is to keep any RF out of the audio ckt. If so, I don't think it would cause too much of a problem - I assume the choke is open, and that you have jumpered it?
:
:Many radios of this vintage used a shunt RF bypass capacitor, about 0.1uF or so, between B+ and B- rather than your series choke arrangement. So, you could try that and see if it makes a difference (keep the choke jumpered).
:
:Are you using a ground connection? That is necessary.
:Doug
:
::Doug, yes - the top one is right (that's what I see and have been using). This is my first battery reflex and I'm unfamiliar. I think I should be able to pull more stations in - more than one strong local one. It is working - but just not well.
::
::The Choke Coil is a goner...necessary in your eyes?
::
:::Hi, Dave. Here's your schematic: http://www.nostalgiaair.org/PagesByModel/960/M0039960.pdf I like the way the schematic has little arrows on all the lines, showing which way the current flows!
:::
:::The way I follow the reflex ckt, I would agree that your set should play on the phones jack - which I guess it does, after a fashion? I wouldn't worry about it before you get the second audio xfmr replaced. Then, if it still plays weak, you can look for a bad connection, etc.
:::
:::A reflex ckt isn't the same as a conventional regen. So the absence of oscillation doesn't worry me. Is your schematic the top one? I see reflex, but no regen. I don't think reflex goes into oscillation like regen - correct me if I'm wrong.
:::Doug
:::
:::
::::Picked up a Dayfan OEM 7 with 2 bad audio transformers and a bad choke coil. Replaced only audio transformer #1 so far and I'm thinking this should work w/o tube #4 and audio xformer #2 (as isn't this just to drive the horn?) - however, I can only receive one local channel with long wire antenna...and it's very weak after they cut their power at night - but yet strong. Shouldn't I be able to get this into oscillation and also pick up other stations? I know a reflex circuit (and is choke coil necessary?).
::::
::::Thanks