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Sci.Electronics.Basics -> Circuit diagram of AM Modulator based on triode valve/tube

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Author: Robert Wilson
Date: 07:42 07-01-07

Hello,
I would like to find a circuit diagram of an AM Modulator scheme based
on a Triode Thermionic valve/tube. I have a SPICE package that has a
Triode valve as a component. The package i'm using is
Simetrix, from Cadence.

Can anyone help please?

Regards,

Robert.

Author: Tom Biasi
Date: 09:16 07-01-07

"Robert Wilson" <rob.wilson@remove.brushhead.plus.com> wrote in message
news:45a0eaf7$0$8721$ed2619ec@ptn-nntp-reader02.plus.net...
> Hello,
> I would like to find a circuit diagram of an AM Modulator scheme based on
> a Triode Thermionic valve/tube. I have a SPICE package that has a Triode
> valve as a component. The package i'm using is
> Simetrix, from Cadence.
>
> Can anyone help please?
>
> Regards,
>
> Robert.

Hi Robert,
Your request is very broad. What frequencies are involved?
Are you talking about modulating an RF signal with audio?
What type of tube do you have in your simulator?

Tom

Author: Robert Wilson
Date: 09:23 07-01-07

Hi Tom,
This is just for a piece of college work, but tha tube I have is an
ECC36 (I guess from Mullard). I am only looking at a modulation
frequency of around 1Khz, the standard audio test tone, on a 200kHz carrier.

Regards,

Robert.

Tom Biasi wrote:
>
> "Robert Wilson" <rob.wilson@remove.brushhead.plus.com> wrote in
message
> news:45a0eaf7$0$8721$ed2619ec@ptn-nntp-reader02.plus.net...
>> Hello,
>> I would like to find a circuit diagram of an AM Modulator scheme based
>> on a Triode Thermionic valve/tube. I have a SPICE package that has a
>> Triode valve as a component. The package i'm using is
>> Simetrix, from Cadence.
>>
>> Can anyone help please?
>>
>> Regards,
>>
>> Robert.
>
> Hi Robert,
> Your request is very broad. What frequencies are involved?
> Are you talking about modulating an RF signal with audio?
> What type of tube do you have in your simulator?
>
> Tom
>

Date: 09:29 07-01-07

Robert Wilson wrote:
> Hello,
> I would like to find a circuit diagram of an AM Modulator scheme based
> on a Triode Thermionic valve/tube. I have a SPICE package that has a
> Triode valve as a component. The package i'm using is
> Simetrix, from Cadence.

Lots of stuff on here. Took me 30 seconds using Google.

http://www.vias.org/basicradio/

Look under "Transmission Of Signals".

Where you will find some modulator circuits using triodes

Plate (anode) modulation:-

http://www.vias.org/basicradio/basic_radio_17_04.html

Grid modulation:-

http://www.vias.org/basicradio/basic_radio_17_05.html

a Class C amplifier with plate modulation from a Class B modulator:-

http://www.vias.org/basicradio/basic_radio_29_02.html

Author: Ancient_Hacker
Date: 09:34 07-01-07

Robert Wilson wrote:
> Hello,
> I would like to find a circuit diagram of an AM Modulator scheme based
> on a Triode Thermionic valve/tube. I have a SPICE package that has a
> Triode valve as a component. The package i'm using is
> Simetrix, from Cadence.
>
> Can anyone help please?
>
> Regards,
>
> Robert.

Go to a library and find an ARRL Handbook from the years 1935 to 1970.
Those have several chapters on AM modulation, with theory and actual
working transmitters and modulators.

The "Theory" in these books is not quite up to EE textbook standards,
but good enough for most purposes.

BTW did you know it's possible to make a very good AM transmitter by
taking an old tube AA5 radio, swapping the audio output and converter
tubes, and moving 4 wires? Cool^3 IMHO.

Now that you know it can be done, doing so is left as an exercise for
the reader :)

Author: Tom Biasi
Date: 09:46 07-01-07

> Tom Biasi wrote:
>>
>> "Robert Wilson" <rob.wilson@remove.brushhead.plus.com> wrote in
message
>> news:45a0eaf7$0$8721$ed2619ec@ptn-nntp-reader02.plus.net...
>>> Hello,
>>> I would like to find a circuit diagram of an AM Modulator scheme based
>>> on a Triode Thermionic valve/tube. I have a SPICE package that has a
>>> Triode valve as a component. The package i'm using is
>>> Simetrix, from Cadence.
>>>
>>> Can anyone help please?
>>>
>>> Regards,
>>>
>>> Robert.
>>
>> Hi Robert,
>> Your request is very broad. What frequencies are involved?
>> Are you talking about modulating an RF signal with audio?
>> What type of tube do you have in your simulator?
>>
>> Tom
>>

"Robert Wilson" <rob.wilson@remove.brushhead.plus.com> wrote in message
news:45a1027c$0$8748$ed2619ec@ptn-nntp-reader02.plus.net...
> Hi Tom,
> This is just for a piece of college work, but tha tube I have is an ECC36
> (I guess from Mullard). I am only looking at a modulation frequency of
> around 1Khz, the standard audio test tone, on a 200kHz carrier.
>
> Regards,
>
> Robert.
>

I don't have anything with that tube but basic triode modulator circuits are
all over the net.

Try here: http://www.vias.org/basicradio/basic_radio_29_02.html

Tom

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