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[email protected] mkolber1@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

I'm looking for technical info for an old monitor panel.

It has a 6x9 speaker, VU meter, transformer, selector switch, variable pad an a bunch of barrier strips on the back.

It is listed as MODEL TCP-MON Series H*o8*81.

I cannot find anything relevant on the net other than info on the related amplifiers.

It also says Bogen Division / Lear Sielger.

It is not a complicated device and I could easily just trace it out but it is not in a very accessible location.


thanks

Mark



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[email protected] makolber@yahoo.com is offline
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Default Bogen Tech Craft Monitor Panel

On Saturday, December 30, 2017 at 7:00:28 AM UTC-5, Mike Rivers wrote:
On 12/29/2017 9:45 PM, wrote:
I'm looking for technical info for an old monitor panel.

It has a 6x9 speaker, VU meter, transformer, selector switch, variable pad an a bunch of barrier strips on the back.

It is listed as MODEL TCP-MON Series H*o8*81.


Are the barrier strips labeled, or is that what you want to know about?
You can probably guess what it does - switch several sources to the
speaker and VU meter. If you can find an input, put a signal in and
experiment to find what it takes to hear it and see the meter move.


--

For a good time, call
http://mikeriversaudio.wordpress.com


Yes, that is clear, the switch selects the input from the barrier strip.

I want to know if it is intended to connect to an 8 ohm system or to a 70V system.

It has a transformer and the speker itself is 8 Ohm.

The volume is too low when I connect it to the 8 Ohm line. I re-connected it to the 70v line and the volume is acceptable and nothing has blown up yet. I just wanted to check that this is going to be ok long term.

Mark



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Scott Dorsey Scott Dorsey is offline
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Default Bogen Tech Craft Monitor Panel

wrote:
Yes, that is clear, the switch selects the input from the barrier strip.

I want to know if it is intended to connect to an 8 ohm system or to a 70V system.

It has a transformer and the speker itself is 8 Ohm.


It's almost certainly 70V. You can verify by checking the resistances on
the transformer.

Believe it or not, Bogen actually does keep docs for a lot of this ancient
stuff. They are pretty good about it, even after having been taken over
by other companies several times since the Lear Siegler days.

The volume is too low when I connect it to the 8 Ohm line. I re-connected it to the 70v line and the volume is acceptable and nothing has blown up yet. I just wanted to check that this is going to be ok long term.


Yes, you're fine. These things were mostly used in 70V school PA systems to
check multiple busses (which could be used to send multiple programs to
different groups of rooms). Movie theatres mostly used Altec program monitors
for the LRCS signals, or ones made by cinema-specific companies like Kintek.
--scott

Mark





--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Default Bogen Tech Craft Monitor Panel

"It is listed as MODEL TCP-MON Series H*o8*81. "

Based upon the above, plus the addition
of "Bogen" or "Tech Craft", I came up with
goose-eggs on a search for a manual.

I did manage to score this manual,
for a 35A:

https://www.bogen.com/products/pdfs/...dfs/PI35Am.pdf

Is that roughly what yours looks like?


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Default Bogen Tech Craft Monitor Panel

On Tuesday, January 2, 2018 at 2:26:27 PM UTC-5, wrote:
"It is listed as MODEL TCP-MON Series H*o8*81. "

Based upon the above, plus the addition
of "Bogen" or "Tech Craft", I came up with
goose-eggs on a search for a manual.

I did manage to score this manual,
for a 35A:

https://www.bogen.com/products/pdfs/...dfs/PI35Am.pdf

Is that roughly what yours looks like?


no not really, mine is taller and has a large VU meter.
I think its's ok. I wanted to avoid puling it out of the rack to trace the circuit.
The details of the transformer in the docs you linked may be helpful.

thanks

Mark

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[email protected] thekmanrocks@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

Could you repost model number info? I could maybe
link you to a manual specific to your piece.
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[email protected] mkolber1@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

On Wednesday, January 3, 2018 at 9:42:03 PM UTC-5, wrote:
Could you repost model number info? I could maybe
link you to a manual specific to your piece.


here is the exact wording on the rear panel
Tech- crafT
Bogen Division
Lear Siegler Inc
Paramus NJ Made in USA
Series H.O8.81
MODEL TCP-MON

So I'm not sure if that is letter O8 or number 08
looks like a letter

thanks

mark

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[email protected] thekmanrocks@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

If it's round then it's an O. Oval it should
be a zero. I'll get crackin.
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[email protected] thekmanrocks@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

"On Wednesday, January 3, 2018 at 9:42:03 PM UTC-5, wrote:
Could you repost model number info? I could maybe
link you to a manual specific to your piece.


here is the exact wording on the rear panel
Tech- crafT
Bogen Division
Lear Siegler Inc
Paramus NJ Made in USA
Series H.O8.81
MODEL TCP-MON

So I'm not sure if that is letter O8 or number 08
looks like a letter

thanks

mark "


Still nothing.

I tried that series with an O and a zero.

Is there anything at all on the front plate/
user controls?


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Scott Dorsey Scott Dorsey is offline
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Default Bogen Tech Craft Monitor Panel

wrote:
On Tuesday, January 2, 2018 at 2:26:27 PM UTC-5, wrote:
"It is listed as MODEL TCP-MON Series H*o8*81. "

Based upon the above, plus the addition
of "Bogen" or "Tech Craft", I came up with
goose-eggs on a search for a manual.

I did manage to score this manual,
for a 35A:

https://www.bogen.com/products/pdfs/...dfs/PI35Am.pdf

Is that roughly what yours looks like?


no not really, mine is taller and has a large VU meter.
I think its's ok. I wanted to avoid puling it out of the rack to trace the circuit.
The details of the transformer in the docs you linked may be helpful.


What you have is a monitor panel that is intended to be used with a rack
of several of those amplifiers (well, actually with the decade-earlier
precursor in the same series) so that an operator can monitor the program
material being routed to several different zones.

This whole series of products consists of modules that can be put together
to form a system that routes multiple program material to different rooms
(and optionally intercom talkback and signalling) for schools and prisons.
You used to see them in hospitals years ago as well. They all used 70V
(or if absolutely necessary) 25V systems.

The panel you have should have at least five pairs of screw terminals,
each of which would be connected to the output of an amplifier. There
should be a rotary switch to select which pair goes to the transformer,
a step down transformer (maybe a DC blocking cap if it's for a system
with DC intercom signalling), and a speaker and meter. Little else on
the panel, I believe.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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[email protected] mkolber1@gmail.com is offline
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Default Bogen Tech Craft Monitor Panel

On Saturday, January 6, 2018 at 7:54:20 AM UTC-5, Scott Dorsey wrote:
wrote:
On Tuesday, January 2, 2018 at 2:26:27 PM UTC-5, wrote:
"It is listed as MODEL TCP-MON Series H*o8*81. "

Based upon the above, plus the addition
of "Bogen" or "Tech Craft", I came up with
goose-eggs on a search for a manual.

I did manage to score this manual,
for a 35A:

https://www.bogen.com/products/pdfs/...dfs/PI35Am.pdf

Is that roughly what yours looks like?


no not really, mine is taller and has a large VU meter.
I think its's ok. I wanted to avoid puling it out of the rack to trace the circuit.
The details of the transformer in the docs you linked may be helpful.


What you have is a monitor panel that is intended to be used with a rack
of several of those amplifiers (well, actually with the decade-earlier
precursor in the same series) so that an operator can monitor the program
material being routed to several different zones.

This whole series of products consists of modules that can be put together
to form a system that routes multiple program material to different rooms
(and optionally intercom talkback and signalling) for schools and prisons.
You used to see them in hospitals years ago as well. They all used 70V
(or if absolutely necessary) 25V systems.

The panel you have should have at least five pairs of screw terminals,
each of which would be connected to the output of an amplifier. There
should be a rotary switch to select which pair goes to the transformer,
a step down transformer (maybe a DC blocking cap if it's for a system
with DC intercom signalling), and a speaker and meter. Little else on
the panel, I believe.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."


that pretty well describes it.
if it is designed for a 25v or 70v line, then I'm good.
it seems to be working fine now that I reconnected it to the 70V output istead of the 8 Ohm output.

3 pics of the unit are here

https://www.dropbox.com/sh/t7xz8ftr2...71B8xO1ua?dl=0

mark

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John Williamson John Williamson is offline
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Default Bogen Tech Craft Monitor Panel

On 07/01/2018 23:22, wrote:
On Saturday, January 6, 2018 at 7:54:20 AM UTC-5, Scott Dorsey wrote:


The panel you have should have at least five pairs of screw terminals,
each of which would be connected to the output of an amplifier. There
should be a rotary switch to select which pair goes to the transformer,
a step down transformer (maybe a DC blocking cap if it's for a system
with DC intercom signalling), and a speaker and meter. Little else on
the panel, I believe.


https://www.dropbox.com/sh/t7xz8ftr2...71B8xO1ua?dl=0

Not that it matters to this application, but that sort of equipment in
the UK normally runs on a 100 Volt line, unless it's in a hazardous area
such as a coal mine, in which case it's 25 Volts to eliminate the
possibility of sparking.


--
Tciao for Now!

John.
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Scott Dorsey Scott Dorsey is offline
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Default Bogen Tech Craft Monitor Panel

John Williamson wrote:
On 07/01/2018 23:22, wrote:
On Saturday, January 6, 2018 at 7:54:20 AM UTC-5, Scott Dorsey wrote:


The panel you have should have at least five pairs of screw terminals,
each of which would be connected to the output of an amplifier. There
should be a rotary switch to select which pair goes to the transformer,
a step down transformer (maybe a DC blocking cap if it's for a system
with DC intercom signalling), and a speaker and meter. Little else on
the panel, I believe.


https://www.dropbox.com/sh/t7xz8ftr2...71B8xO1ua?dl=0

Not that it matters to this application, but that sort of equipment in
the UK normally runs on a 100 Volt line, unless it's in a hazardous area
such as a coal mine, in which case it's 25 Volts to eliminate the
possibility of sparking.


In the US, the NEC says that wiring above 100V peak are considered class I
signalling circuits and have to be treated more or less like power wiring.
Which means in most locations it has to be in conduit. 100V or less and
it can be treated as Class II and the wiring can just be out free.

So... we have 70V RMS constant voltage audio systems whose peak current is
sort of expected to be 100V. Which is kind of unrealistic because it's
making assumptions about the waveform, but that's how it's usually interpreted.
So those systems can be in class II wiring.

In the EU the rules are slightly different so they tend to run systems of
100V RMS because that's where their legal line is drawn.

Now... there are SOME localities in the US where the law is more strict
than the NEC. Hampton, Virginia schools for instance have 25V constant
voltage systems for intercoms because anything higher than 25V RMS there
needs to be in conduit.

It's all more legal silliness than actual technical constraints.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."
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Mike Rivers[_2_] Mike Rivers[_2_] is offline
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Default Bogen Tech Craft Monitor Panel

On 1/8/2018 1:10 PM, Scott Dorsey wrote:
In the US, the NEC says that wiring above 100V peak are considered class I
signalling circuits and have to be treated more or less like power wiring.
Which means in most locations it has to be in conduit. 100V or less and
it can be treated as Class II and the wiring can just be out free.


I recall reading that the reason why the maximum phantom power is 48v
because in Europe, anything above that is considered power wiring and
has to follow the appropriate rules.

--

For a good time, call http://mikeriversaudio.wordpress.com
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