The wireless intercom, however, may use a connection to the AC powerline to transmit the signal around the house. I haven't found anything about this old Vocaline unit.
Good luck,
Rich
&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
:I recently found a Vocaline model CC-20D at a second hand store. I think it's some sort of wireless intercom. It has 2 50B5 tubes as well as 2 12AU6 tubes and a selenium rectifier. It has a brown bakelite case, says "Vocatron" on the front. Does anyone know more about this or where I might find some information? It was only $2.00 so I was thinking of using it for spare parts.
:Your intercom is probably similar to the old KnightKit AM Broadcaster. http://www.smecc.org/knight_kit_home_broadcasters_-_allied_electronics.htm
:
:The wireless intercom, however, may use a connection to the AC powerline to transmit the signal around the house. I haven't found anything about this old Vocaline unit.
:
:Good luck,
:Rich
:&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
:
:
::I recently found a Vocaline model CC-20D at a second hand store. I think it's some sort of wireless intercom. It has 2 50B5 tubes as well as 2 12AU6 tubes and a selenium rectifier. It has a brown bakelite case, says "Vocatron" on the front. Does anyone know more about this or where I might find some information? It was only $2.00 so I was thinking of using it for spare parts.
T.
:You should fix it...use it in your house.
:
:T.
T.
:You would need another unit.
:
:T.
5113..or the 13th week of 1951….but sometimes shortened to 1-13…which could be a ’51 or ‘61 vintage unit. That
considering that ’41 ante dates miniature envelopes and by ’71, they were on their obsolescence trail.
Now as to the RF carrier current consideration, if you are seeing a healthy bit of RF inductance sitting there on/under
the chassis, you can figure that to be the design of unit which it is. That would be an RF transformer that is inductively
and capacitive isolatively coupled into the AC power line. I would suspect another smaller RF coil associated with one
12AU6 and that feeding into one 50B5 and on to the speaker for receive operation. If a second coil is not present, one
would suspect a band switching of the first transformer mentioned back into the receive section.
That would leave another 12AU6 to be receiving audio in reverse from the speaker….being used as a mike….and then
the hi z primary of the output transformer is coupled into that 12AU6 first grid circuit to be passed on to the second 50B5
which would be functioning as a modulated power oscillator. That would entail the functioning of your single unit . A pair
of units would always be in receive mode until the transmit (intercom) bar is activated to make that unit send out a carrier
to be picked up by the other unit.
What you might try is to expose the Vocaline chassis and power it up while having an AM receiver radio in very close
proximity to it. Then start the unit transmitting by activation of the talk bar/switch , simultaneously you are starting a tuning
sweep at 540 upwards as you listen for the carrier silencing noise of being tuned into. To further confirm it , an adjunct
finger to the one activating the talk function can be lightly dragged across the spkr cone to create noise if you opt to not
shout / talk loudly into the speaker. Once you find an initial signal , take note of its freq and tune higher to see is there is
another signal replication as a harmonic, and then one could subtract the two to ascertain the transmitters fundamental
freq.
In my experiences I found 175 khz to be one common and popular frequency. As an example, working with that figure,
one would expect to find a harmonic signal at ~700kc---875kc---1050kc---1225kc, etc, but each progressively weaker.
BUT, that would pinpoint your power oscillators primary freq.
To get the unit functioning at a higher frequency would entail stripping of coil primary turns to get up into a higher resonating
freq up on the B.C. band.
73’s de Edd
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:I recently found a Vocaline model CC-20D at a second hand store. I think it's some sort of wireless intercom. It has 2 50B5 tubes as well as 2 12AU6 tubes and a selenium rectifier. It has a brown bakelite case, says "Vocatron" on the front. Does anyone know more about this or where I might find some information? It was only $2.00 so I was thinking of using it for spare parts.
:
:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:In the interim you might further squelch your curiosity as to its manner of design by initiate a deeper inspection. As to
:the utilization of a sel rect, that would tend to center in on ~1950 vintage. For further confirmation , inspect tubes and
:filter capacitors for code dates. If not an alphabetical configuration, a typical numerical example might be:
:
:5113..or the 13th week of 1951….but sometimes shortened to 1-13…which could be a ’51 or ‘61 vintage unit. That
:considering that ’41 ante dates miniature envelopes and by ’71, they were on their obsolescence trail.
:Now as to the RF carrier current consideration, if you are seeing a healthy bit of RF inductance sitting there on/under
:the chassis, you can figure that to be the design of unit which it is. That would be an RF transformer that is inductively
:and capacitive isolatively coupled into the AC power line. I would suspect another smaller RF coil associated with one
:12AU6 and that feeding into one 50B5 and on to the speaker for receive operation. If a second coil is not present, one
:would suspect a band switching of the first transformer mentioned back into the receive section.
:That would leave another 12AU6 to be receiving audio in reverse from the speaker….being used as a mike….and then
:the hi z primary of the output transformer is coupled into that 12AU6 first grid circuit to be passed on to the second 50B5
:which would be functioning as a modulated power oscillator. That would entail the functioning of your single unit . A pair
:of units would always be in receive mode until the transmit (intercom) bar is activated to make that unit send out a carrier
:to be picked up by the other unit.
:What you might try is to expose the Vocaline chassis and power it up while having an AM receiver radio in very close
:proximity to it. Then start the unit transmitting by activation of the talk bar/switch , simultaneously you are starting a tuning
:sweep at 540 upwards as you listen for the carrier silencing noise of being tuned into. To further confirm it , an adjunct
:finger to the one activating the talk function can be lightly dragged across the spkr cone to create noise if you opt to not
:shout / talk loudly into the speaker. Once you find an initial signal , take note of its freq and tune higher to see is there is
: another signal replication as a harmonic, and then one could subtract the two to ascertain the transmitters fundamental
: freq.
:In my experiences I found 175 khz to be one common and popular frequency. As an example, working with that figure,
:one would expect to find a harmonic signal at ~700kc---875kc---1050kc---1225kc, etc, but each progressively weaker.
:BUT, that would pinpoint your power oscillators primary freq.
:To get the unit functioning at a higher frequency would entail stripping of coil primary turns to get up into a higher resonating
: freq up on the B.C. band.
:73’s de Edd
:
:
:
:
:~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::I recently found a Vocaline model CC-20D at a second hand store. I think it's some sort of wireless intercom. It has 2 50B5 tubes as well as 2 12AU6 tubes and a selenium rectifier. It has a brown bakelite case, says "Vocatron" on the front. Does anyone know more about this or where I might find some information? It was only $2.00 so I was thinking of using it for spare parts.
Boy, you sure took the simpler task of the two.
I think that you need to hope that there is further authentification by finding yet another code date on the units electrolytic filter capacitor….particularly if it is a can type of unit.
To get the info that follows, you are taking your mouse in hand and going to:
http://www.triodeel.com/eiacode.htm
Now it is readily apparent that the first three numbers verifies the EIA designator of The Mighty Tung Sol Company Extraordinaire…..which is 322 then we take on the 347 as being the 47th week of 1953 with 1 being the first…(day shift) crew .
So your device is a combinational very high and very low tech. High tech in the respect of its design and manner of operation , while all other units had wires strung between them. The low tech aspect, by probably being at the end of the window of utilizing selenium rectifiers in its power supply.
They definitely got a bad rap for their emanation of poisonous fumes upon overload / arcover/ failure modes, typically more common in heavy power demands of a television versus the minute power demands when designed into a VTVM instrument power supply for example.
73’s de Edd
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:I checked the tubes. They are all Tung-Sol branded and they all have the code of 322347-1. So would that mean 1947 possibly?
:
::
::~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
::In the interim you might further squelch your curiosity as to its manner of design by initiate a deeper inspection. As to
::the utilization of a sel rect, that would tend to center in on ~1950 vintage. For further confirmation , inspect tubes and
::filter capacitors for code dates. If not an alphabetical configuration, a typical numerical example might be:
::
::5113..or the 13th week of 1951….but sometimes shortened to 1-13…which could be a ’51 or ‘61 vintage unit. That
::considering that ’41 ante dates miniature envelopes and by ’71, they were on their obsolescence trail.
::Now as to the RF carrier current consideration, if you are seeing a healthy bit of RF inductance sitting there on/under
::the chassis, you can figure that to be the design of unit which it is. That would be an RF transformer that is inductively
::and capacitive isolatively coupled into the AC power line. I would suspect another smaller RF coil associated with one
::12AU6 and that feeding into one 50B5 and on to the speaker for receive operation. If a second coil is not present, one
::would suspect a band switching of the first transformer mentioned back into the receive section.
::That would leave another 12AU6 to be receiving audio in reverse from the speaker….being used as a mike….and then
::the hi z primary of the output transformer is coupled into that 12AU6 first grid circuit to be passed on to the second 50B5
::which would be functioning as a modulated power oscillator. That would entail the functioning of your single unit . A pair
::of units would always be in receive mode until the transmit (intercom) bar is activated to make that unit send out a carrier
::to be picked up by the other unit.
::What you might try is to expose the Vocaline chassis and power it up while having an AM receiver radio in very close
::proximity to it. Then start the unit transmitting by activation of the talk bar/switch , simultaneously you are starting a tuning
::sweep at 540 upwards as you listen for the carrier silencing noise of being tuned into. To further confirm it , an adjunct
::finger to the one activating the talk function can be lightly dragged across the spkr cone to create noise if you opt to not
::shout / talk loudly into the speaker. Once you find an initial signal , take note of its freq and tune higher to see is there is
:: another signal replication as a harmonic, and then one could subtract the two to ascertain the transmitters fundamental
:: freq.
::In my experiences I found 175 khz to be one common and popular frequency. As an example, working with that figure,
::one would expect to find a harmonic signal at ~700kc---875kc---1050kc---1225kc, etc, but each progressively weaker.
::BUT, that would pinpoint your power oscillators primary freq.
::To get the unit functioning at a higher frequency would entail stripping of coil primary turns to get up into a higher resonating
:: freq up on the B.C. band.
::73’s de Edd
::
::
::
::
::~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:::I recently found a Vocaline model CC-20D at a second hand store. I think it's some sort of wireless intercom. It has 2 50B5 tubes as well as 2 12AU6 tubes and a selenium rectifier. It has a brown bakelite case, says "Vocatron" on the front. Does anyone know more about this or where I might find some information? It was only $2.00 so I was thinking of using it for spare parts.