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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Sun 04, 2021 9:06 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
Chas wrote:
mrx wrote:
anyone know what value the variable tuning capacitors should be? the article does not list it.
Go Here:

https://www.antiqueradios.com/forums/vi ... 1&t=342931

and here:

https://www.antiqueradios.com/forums/vi ... 1&t=344081

The Deforest resonated the coils with a 1000pf variable cap. The tuning ranges in meters are given to the coils in that combination. The resonance for other variable caps can be found by either calculation or from a chart in ALFRED A GHIRARDIs Radio troubleshooters handbook... chas


Thanks

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Sun 04, 2021 9:10 pm 
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Posts: 9224
Location: Gretna, Nebraska
You do some exceptional work, Jan. Just beautiful.
Your workmanship probably exceeds any of the factory versions of this model.

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 Post subject: Forest? Armstrong? Audion 1923, all concert, patent Audion
PostPosted: Apr Mon 05, 2021 10:50 am 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
yan_sk wrote:
Greetings colleagues, The above shown receiver design is not a replica. It is an implementation according to the instructions printed in 1923 in the magazine RADIOAMATÉR, this is the first information published in the press about this type "all concert" of receiver in Czechoslovakia. Here is my effort to design a receiver after almost a hundred years.
You can see the construction process,
https://youtu.be/NZEb_q1iN38
next part
https://youtu.be/7ieXicobT54
Regards
Jan


In connection with the construction of the audion/oscillator, I read a lot about the discovery of Lee de Forest and Edwin Howard Armstrong. I know how it was formally decided until the sad end of E. H. Armstrong. But Armstrong has more sympathy, what was the main problem? Are there any documents for that?
Thanks
Jan


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Tue 06, 2021 12:52 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
Chas wrote:
mrx wrote:
anyone know what value the variable tuning capacitors should be? the article does not list it.
Go Here:

https://www.antiqueradios.com/forums/vi ... 1&t=342931

and here:

https://www.antiqueradios.com/forums/vi ... 1&t=344081

The Deforest resonated the coils with a 1000pf variable cap. The tuning ranges in meters are given to the coils in that combination. The resonance for other variable caps can be found by either calculation or from a chart in ALFRED A GHIRARDIs Radio troubleshooters handbook... chas


Will have to get a copy of the book, looks like he is using 500MMFD variable caps.i

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 Post subject: Re: Forest? Armstrong? Audion 1923, all concert, patent Audi
PostPosted: Apr Tue 06, 2021 12:53 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
yan_sk wrote:
yan_sk wrote:
Greetings colleagues, The above shown receiver design is not a replica. It is an implementation according to the instructions printed in 1923 in the magazine RADIOAMATÉR, this is the first information published in the press about this type "all concert" of receiver in Czechoslovakia. Here is my effort to design a receiver after almost a hundred years.
You can see the construction process,
https://youtu.be/NZEb_q1iN38
next part
https://youtu.be/7ieXicobT54
Regards
Jan


In connection with the construction of the audion/oscillator, I read a lot about the discovery of Lee de Forest and Edwin Howard Armstrong. I know how it was formally decided until the sad end of E. H. Armstrong. But Armstrong has more sympathy, what was the main problem? Are there any documents for that?
Thanks
Jan


Have you looked at the https://worldradiohistory.com/ website, lots of resources there.

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Tue 06, 2021 2:26 pm 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
mrx wrote:
Chas wrote:
mrx wrote:
anyone know what value the variable tuning capacitors should be? the article does not list it.
Go Here:

https://www.antiqueradios.com/forums/vi ... 1&t=342931

and here:

https://www.antiqueradios.com/forums/vi ... 1&t=344081

The Deforest resonated the coils with a 1000pf variable cap. The tuning ranges in meters are given to the coils in that combination. The resonance for other variable caps can be found by either calculation or from a chart in ALFRED A GHIRARDIs Radio troubleshooters handbook... chas


Will have to get a copy of the book, looks like he is using 500MMFD variable caps.i


yes, in the manual the antenna capacitor is 1000pF and the anode 500pF. Or 500pF and 300pF. Of course, as a colleague writes, it is a resonant frequency, ie the choice of inductance and capacitance.


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Tue 06, 2021 3:40 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 16353
Location: S. Dartmouth MA 02748-1225 USA
yan_sk wrote:
...yes, in the manual the antenna capacitor is 1000pF and the anode 500pF. Or 500pF and 300pF. Of course, as a colleague writes, it is a resonant frequency, ie the choice of inductance and capacitance.
From what I have in a "broken" honeycomb coil sets, most are marked with the number of turns. I also have a a couple of flat "spiderweb/pancake" coils that are configured with the M/F connector, some are home made. It is possible for a Morris coil winder to create up to a 250 turn coil. Beyond that the wire gauge has to be reduced and the wire waxed to keep it from sloughing off the during the build of the coil. The layout of the components will dictate if the radio can get into the shortwaves. My coil collection has a couple of 35 turn coils. With a 500pf variable and coils with fewer windings is should be possible to get to 80 meters. The determining factor is losses in both the coil and the larger variable condenser. The coil collection consists of Branston, Coto, DeForest, Giblin and "No-Names" of 35 up to 2500 turns, heavy... Some of the coils use both celluloid and leather parts. The leather has dried, hardened and broken and the celluloid is slowly decomposing and creating acids that is eating at the turns, The celluloid is the form for the 35 turn coil... chas

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Apr Sat 10, 2021 9:15 am 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
Chas wrote:
mrx wrote:
anyone know what value the variable tuning capacitors should be? the article does not list it.
Go Here:

https://www.antiqueradios.com/forums/vi ... 1&t=342931

and here:

https://www.antiqueradios.com/forums/vi ... 1&t=344081

The Deforest resonated the coils with a 1000pf variable cap. The tuning ranges in meters are given to the coils in that combination. The resonance for other variable caps can be found by either calculation or from a chart in ALFRED A GHIRARDIs Radio troubleshooters handbook... chas


uf ..., Forest MR6 is a wonderful device, coils about as much, getting originals is always a problem, for some reason they are almost never complete with a radio. It's nice to have at least some originals, they can be repaired, or at least replicas can be made.
regards
Jan


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 14, 2021 7:06 pm 
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Joined: Mar Thu 24, 2011 6:23 am
Posts: 559
Location: New Jersey 07755
Do you have any construction pictures or advice?
Your craftsmanship is superb. I think there would be a great deal of interest amongst are fellow forum friends!

Peace,
DrRick


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 14, 2021 8:42 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
DrRick wrote:
Do you have any construction pictures or advice?
Your craftsmanship is superb. I think there would be a great deal of interest amongst are fellow forum friends!

Peace,
DrRick


Building my own over the winter (the american version, using stock radio parts), think I have all the parts. Laying out the panel will be tricky, as it seems small when you load it up, maybe need another 1" or so.

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Wed 16, 2021 8:29 am 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
mrx wrote:
DrRick wrote:
Do you have any construction pictures or advice?
Your craftsmanship is superb. I think there would be a great deal of interest amongst are fellow forum friends!

Peace,
DrRick


Building my own over the winter (the american version, using stock radio parts), think I have all the parts. Laying out the panel will be tricky, as it seems small when you load it up, maybe need another 1" or so.


Thank you, I am pleased with your interest. For these devices, the dimensions are given in the manual, but this must be taken as a recommendation. It always depends on the components used and especially on those that can now be obtained or manufactured.
A reference to the instructions in the RADIOAMATER 1923 magazine is given in the previous comments.


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Wed 16, 2021 8:33 am 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
yan_sk wrote:
mrx wrote:
DrRick wrote:
Do you have any construction pictures or advice?
Your craftsmanship is superb. I think there would be a great deal of interest amongst are fellow forum friends!

Peace,
DrRick


Building my own over the winter (the american version, using stock radio parts), think I have all the parts. Laying out the panel will be tricky, as it seems small when you load it up, maybe need another 1" or so.


Thank you, I am pleased with your interest. For these devices, the dimensions are given in the manual, but this must be taken as a recommendation. It always depends on the components used and especially on those that can now be obtained or manufactured.
A reference to the instructions in the RADIOAMATER 1923 magazine is given in the previous comments.


an addition, our magazine probably drew from the source https://worldradiohistory.com/UK/Modern ... -S-OCR.pdf


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Sat 19, 2021 6:20 am 
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Joined: Oct Fri 11, 2019 3:03 am
Posts: 84
Location: Seattle, WA (from Hungary)
Really Nice!!


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 21, 2021 1:50 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
Yan,

What are the values for the capacitors k1 and k2.

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 21, 2021 4:09 am 
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Joined: Mar Sun 22, 2020 5:56 am
Posts: 1893
Location: Arvada, CO, 80004
Wow that is beautiful.

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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 21, 2021 1:09 pm 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
mrx wrote:
Yan,

What are the values for the capacitors k1 and k2.


thank you for your interest, k1 about 200-400pF, k2 1-1.5nF.


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 21, 2021 1:12 pm 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
Mr. Highlander wrote:
Wow that is beautiful.


thank you for your appreciation


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jun Mon 21, 2021 1:26 pm 
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Joined: Sep Sat 29, 2018 10:01 pm
Posts: 71
Mr. Highlander wrote:
Wow that is beautiful.


thank you for your appreciation


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 Post subject: Re: Construction 3 tubes Audion 1923, all concert, patent Au
PostPosted: Jul Sun 04, 2021 3:02 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 3459
Location: Boston, Massachusetts
if building your own would you use metal or bakelite binding posts, both seem period correct.

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