I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
Any ideas? It's hard on my ego to be baffled by such a simple radio.
Thank for any help,
Bud
:
:I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
:
:I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
:
:I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
:
:Any ideas? It's hard on my ego to be baffled by such a simple radio.
:
:Thank for any help,
:
:Bud
:
:
:
Ter
::
::I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
::
::I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
::
::I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
::
::Any ideas? It's hard on my ego to be baffled by such a simple radio.
::
::Thank for any help,
::
::Bud
::
::
::
:
:Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
:Ter
:
|
Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
Thanks for your advice. Changing the resistor value did increase audio output, I went all the way up to 100K without the audio flattening. However, I still can only pick up my in-house AM transmitter with about 30 feet of antenna. When using a signal generator, I have to have the RF output all the way up to pass a signal.
I did notice that there is a big signal loss between the Detector grid and plate, is that normal in a regenerative circuit?
I was told this set with 200 feet of antenna used to drive an AK horn speaker but I don't have the means to test under those conditions.
Bud
:
:
:
:
:
:
:
:
:
:
:
:
:Sir Bud Ruuuuuuh. . . . . .
:
:
:In the manner in which you are trying to evaluate the set with the use of a signal tracer.
:
:
:Try:
:
:
:Solely using a DC isolative capacitor for blocking, you should go to the terminals of the interstage audio driver transformer and find audio on the connection that is fed in from the detector stage.
:
:
:Walking over to the other side of the transformer should find audio on its grid drive connection.
:
:
:AND now . . . what you are REALLY REALLY wanting . . . is for BEDDA - BEDDA results on the the plate of the AF amp stage
:
:
:Utilizing a proper high speaker or even headphones is requiring that stage to be basically a current/power amplification oriented stage.
:
:
:Now in your special testing / evaluation procedure . . . think of re-orienting it into a voltage amplification manner of operation.
:
:
:How ? . . . well by the shifting from the very limited voltage swing being able to be achieved with that low of a value of subbed in plate load resistor to using a higher value..
:
:
:Start by trying and walking on up into the 5-10-20-47-100 K values until you hit an optimum OR the onset of AF flat topping and its created distortion..
:
:
:Standing by . . . ..
:
:
:
:
:
:73's de Edd
:
:
:
:
:
:
:
:
:
:
:
:
:Simple little two-tube, regenerative radio not operating properly.
:
:I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
:
:I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
:
:I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
:
:Any ideas? It's hard on my ego to be baffled by such a simple radio.
:
:Thank for any help,
:
:Bud
:
:
:
:
:
:Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
:Ter
:
:
:
:
:
:
:This radio uses headphones to complete the B+ circuit to the output tube plate, so I substituted a resistor to replicate the resistance of the original headphones. An output transformer is not used, the audio is taken right off the 201A plate.
:
:Bud R
:
:
:
:Thanks for your advice. Changing the resistor value did increase audio output, I went all the way up to 100K without the audio flattening. However, I still can only pick up my in-house AM transmitter with about 30 feet of antenna. When using a signal generator, I have to have the RF output all the way up to pass a signal.
:
:I did notice that there is a big signal loss between the Detector grid and plate, is that normal in a regenerative circuit?
:
:I was told this set with 200 feet of antenna used to drive an AK horn speaker but I don't have the means to test under those conditions.
:
:Bud
:
:
::
::
:: :: :: :: :: EDD, as always you ARE the king! Sometimes I think you're really a computer with AI Yes Bud, a simple two tube is going to require as much antenna as you can give it. It also probably needs a solid ground. :: :: :: :: |
::
::
::
::
::
::
::
::
::Simple little two-tube, regenerative radio not operating properly.
::
::I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
::
::I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
::
::I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
::
::Any ideas? It's hard on my ego to be baffled by such a simple radio.
::
::Thank for any help,
::
::Bud
::
::
::
::
::
::Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
::Ter
::
::
::
::
::
::
::This radio uses headphones to complete the B+ circuit to the output tube plate, so I substituted a resistor to replicate the resistance of the original headphones. An output transformer is not used, the audio is taken right off the 201A plate.
::
::Bud R
::
::
:
http://users.erols.com/radiola/C51man.htm
:::Edd,
::
::Thanks for your advice. Changing the resistor value did increase audio output, I went all the way up to 100K without the audio flattening. However, I still can only pick up my in-house AM transmitter with about 30 feet of antenna. When using a signal generator, I have to have the RF output all the way up to pass a signal.
::
::I did notice that there is a big signal loss between the Detector grid and plate, is that normal in a regenerative circuit?
::
::I was told this set with 200 feet of antenna used to drive an AK horn speaker but I don't have the means to test under those conditions.
::
::Bud
::
::
:::
:::
:::
:::
:::
:::
:::
:
:EDD, as always you ARE the king! Sometimes I think you're really a computer with AI
:
:Yes Bud, a simple two tube is going to require as much antenna as you can give it. It also probably needs a solid ground.
:DO NOT try using any part of an electrical outlet for any of this. Keep us posted as to your success. By the way, which transmitter are you using? Just interested. I've had a lot of success with the AES K-488.
:Terry
:::
:::
:::
:::
:::
:::Sir Bud Ruuuuuuh. . . . . .
:::
:::
:::In the manner in which you are trying to evaluate the set with the use of a signal tracer.
:::
:::
:::Try:
:::
:::
:::Solely using a DC isolative capacitor for blocking, you should go to the terminals of the interstage audio driver transformer and find audio on the connection that is fed in from the detector stage.
:::
:::
:::Walking over to the other side of the transformer should find audio on its grid drive connection.
:::
:::
:::AND now . . . what you are REALLY REALLY wanting . . . is for BEDDA - BEDDA results on the the plate of the AF amp stage
:::
:::
:::Utilizing a proper high speaker or even headphones is requiring that stage to be basically a current/power amplification oriented stage.
:::
:::
:::Now in your special testing / evaluation procedure . . . think of re-orienting it into a voltage amplification manner of operation.
:::
:::
:::How ? . . . well by the shifting from the very limited voltage swing being able to be achieved with that low of a value of subbed in plate load resistor to using a higher value..
:::
:::
:::Start by trying and walking on up into the 5-10-20-47-100 K values until you hit an optimum OR the onset of AF flat topping and its created distortion..
:::
:::
:::Standing by . . . ..
:::
:::
:::
:::
:::
:::73's de Edd
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::
:::Simple little two-tube, regenerative radio not operating properly.
:::
:::I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
:::
:::I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
:::
:::I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
:::
:::Any ideas? It's hard on my ego to be baffled by such a simple radio.
:::
:::Thank for any help,
:::
:::Bud
:::
:::
:::
:::
:::
:::Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
:::Ter
:::
:::
:::
:::
:::
:::
:::This radio uses headphones to complete the B+ circuit to the output tube plate, so I substituted a resistor to replicate the resistance of the original headphones. An output transformer is not used, the audio is taken right off the 201A plate.
:::
:::Bud R
:::
:::
::
:
http://users.erols.com/radiola/C51art.htm
:A UX201A normally has 90V B+. Check out the link below. It talks about using 90V B+ instead of 45V to increase the volume.
:
:http://users.erols.com/radiola/C51man.htm
:
:
::::Edd,
:::
:::Thanks for your advice. Changing the resistor value did increase audio output, I went all the way up to 100K without the audio flattening. However, I still can only pick up my in-house AM transmitter with about 30 feet of antenna. When using a signal generator, I have to have the RF output all the way up to pass a signal.
:::
:::I did notice that there is a big signal loss between the Detector grid and plate, is that normal in a regenerative circuit?
:::
:::I was told this set with 200 feet of antenna used to drive an AK horn speaker but I don't have the means to test under those conditions.
:::
:::Bud
:::
:::
::::
::::
::::
::::
::::
::::
::::
::
::EDD, as always you ARE the king! Sometimes I think you're really a computer with AI
::
::Yes Bud, a simple two tube is going to require as much antenna as you can give it. It also probably needs a solid ground.
::DO NOT try using any part of an electrical outlet for any of this. Keep us posted as to your success. By the way, which transmitter are you using? Just interested. I've had a lot of success with the AES K-488.
::Terry
::::
::::
::::
::::
::::
::::Sir Bud Ruuuuuuh. . . . . .
::::
::::
::::In the manner in which you are trying to evaluate the set with the use of a signal tracer.
::::
::::
::::Try:
::::
::::
::::Solely using a DC isolative capacitor for blocking, you should go to the terminals of the interstage audio driver transformer and find audio on the connection that is fed in from the detector stage.
::::
::::
::::Walking over to the other side of the transformer should find audio on its grid drive connection.
::::
::::
::::AND now . . . what you are REALLY REALLY wanting . . . is for BEDDA - BEDDA results on the the plate of the AF amp stage
::::
::::
::::Utilizing a proper high speaker or even headphones is requiring that stage to be basically a current/power amplification oriented stage.
::::
::::
::::Now in your special testing / evaluation procedure . . . think of re-orienting it into a voltage amplification manner of operation.
::::
::::
::::How ? . . . well by the shifting from the very limited voltage swing being able to be achieved with that low of a value of subbed in plate load resistor to using a higher value..
::::
::::
::::Start by trying and walking on up into the 5-10-20-47-100 K values until you hit an optimum OR the onset of AF flat topping and its created distortion..
::::
::::
::::Standing by . . . ..
::::
::::
::::
::::
::::
::::73's de Edd
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::
::::Simple little two-tube, regenerative radio not operating properly.
::::
::::I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
::::
::::I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
::::
::::I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
::::
::::Any ideas? It's hard on my ego to be baffled by such a simple radio.
::::
::::Thank for any help,
::::
::::Bud
::::
::::
::::
::::
::::
::::Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
::::Ter
::::
::::
::::
::::
::::
::::
::::This radio uses headphones to complete the B+ circuit to the output tube plate, so I substituted a resistor to replicate the resistance of the original headphones. An output transformer is not used, the audio is taken right off the 201A plate.
::::
::::Bud R
::::
::::
:::
::
:
One thing I just figured out is that the interstage transformer is not original since it uses a 4:1 ratio as opposed to the 9:1 referenced in the article. Looking at the diagram in Rider's I can see it is definitely a replacement transformer. That would account for the lack of gain. I guess without finding another transformer this unit is working as good as it can.
I am using the SSTran AM3000 transmitte. I started with the AES kit, but the SSTran is like the difference between a model T and a modern car. The audio signal is clean and stable. It's also affordable and fun to assemble.
Bud
More Crosley information.
:
:http://users.erols.com/radiola/C51art.htm
:
::A UX201A normally has 90V B+. Check out the link below. It talks about using 90V B+ instead of 45V to increase the volume.
::
::http://users.erols.com/radiola/C51man.htm
::
::
:::::Edd,
::::
::::Thanks for your advice. Changing the resistor value did increase audio output, I went all the way up to 100K without the audio flattening. However, I still can only pick up my in-house AM transmitter with about 30 feet of antenna. When using a signal generator, I have to have the RF output all the way up to pass a signal.
::::
::::I did notice that there is a big signal loss between the Detector grid and plate, is that normal in a regenerative circuit?
::::
::::I was told this set with 200 feet of antenna used to drive an AK horn speaker but I don't have the means to test under those conditions.
::::
::::Bud
::::
::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::
:::EDD, as always you ARE the king! Sometimes I think you're really a computer with AI
:::
:::Yes Bud, a simple two tube is going to require as much antenna as you can give it. It also probably needs a solid ground.
:::DO NOT try using any part of an electrical outlet for any of this. Keep us posted as to your success. By the way, which transmitter are you using? Just interested. I've had a lot of success with the AES K-488.
:::Terry
:::::
:::::
:::::
:::::
:::::
:::::Sir Bud Ruuuuuuh. . . . . .
:::::
:::::
:::::In the manner in which you are trying to evaluate the set with the use of a signal tracer.
:::::
:::::
:::::Try:
:::::
:::::
:::::Solely using a DC isolative capacitor for blocking, you should go to the terminals of the interstage audio driver transformer and find audio on the connection that is fed in from the detector stage.
:::::
:::::
:::::Walking over to the other side of the transformer should find audio on its grid drive connection.
:::::
:::::
:::::AND now . . . what you are REALLY REALLY wanting . . . is for BEDDA - BEDDA results on the the plate of the AF amp stage
:::::
:::::
:::::Utilizing a proper high speaker or even headphones is requiring that stage to be basically a current/power amplification oriented stage.
:::::
:::::
:::::Now in your special testing / evaluation procedure . . . think of re-orienting it into a voltage amplification manner of operation.
:::::
:::::
:::::How ? . . . well by the shifting from the very limited voltage swing being able to be achieved with that low of a value of subbed in plate load resistor to using a higher value..
:::::
:::::
:::::Start by trying and walking on up into the 5-10-20-47-100 K values until you hit an optimum OR the onset of AF flat topping and its created distortion..
:::::
:::::
:::::Standing by . . . ..
:::::
:::::
:::::
:::::
:::::
:::::73's de Edd
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::
:::::Simple little two-tube, regenerative radio not operating properly.
:::::
:::::I don't have a horn speaker or headphones, I'm substituting a 1K resistor and listening through a .047 cap in to a signal tracer. With the audio amplification all the way up on the signal tracer I can just hear the broadcast from my AM transmitter. Not good.
:::::
:::::I get some gain between the detector plate and audio tube grid so I assume the interstage transformer is good. It measures 1K on the primary and 4K on the secondary windings. The grid leak resistor is good and I've substituted several known good 201As.
:::::
:::::I am losing signal strength between the output tube grid and plate. All my voltages are good, I'm using 45v and 22v for B+, with 3v grid bias.
:::::
:::::Any ideas? It's hard on my ego to be baffled by such a simple radio.
:::::
:::::Thank for any help,
:::::
:::::Bud
:::::
:::::
:::::
:::::
:::::
:::::Is there some reason the output has to be terminated? I would think that's where the problem is. I use a signal tracer to check the output of radios all the time, like my Brunswick and my Atwater Kent model 30. and I never have a speaker or headphones hooked up. Have you tried it without the resistor. Also, is there some DC on the output that requires the capacitor? Does it have an output transformer? Need more info.
:::::Ter
:::::
:::::
:::::
:::::
:::::
:::::
:::::This radio uses headphones to complete the B+ circuit to the output tube plate, so I substituted a resistor to replicate the resistance of the original headphones. An output transformer is not used, the audio is taken right off the 201A plate.
:::::
:::::Bud R
:::::
:::::
::::
:::
::
: