Dubbing Buss

[Mack A. Damia]

Hi, I have just dropped in to see if I can find out more about the
problem I am trying to solve.

I am putting together a vintage stereo system:

Pioneer SX990 amp/receiver
TEAC A-1500 Reel-to-Reel tape deck
Sony dual cassette deck
Turntable

TEAC CD player (not too vintage - works in AUX)

Here's the problem:

I want to connect both the reel-to-reel tape deck and the cassette
tape deck at the same time. I have purchased a Realistic Tape Control
Center with room for three decks.

http://www.ebay.com/itm/Realistic-42-2105-Stereo-Tape-Control-Center-RCA-Dubbing-Buss-Hub-/320989491354?pt=US_Other_Pro_Audio&hash=item4abc76f09a

I'm not too aware of the lingo. I think I know what dubbing means
(transferring from one to another). Not certain what a buss is.

I have accessed an instruction booklet. This is what it says (in
part):

SWITCH FUNCTIONS (Notice front panel)

The top road of switches determines the Input connection to the three
decks:

- When Up, the Deck(s) is connected to the receiver/amplifier.
- In the center position, the Deck(s) is not connected (off).
- In the Down position, the Deck(s) is connected to a Dubbing Buss.

The lower row of switches determines the Output connection of the
three decks:

- When UP, the Deck(s) is connected to the Dubbing Buss.
- In the center position, the Deck(s0 is not connected (off).
- In the Down position, the Deck(s) is connected to the Output.

The switch at the right has two positions and determines the signal
being passed onto the receiver/amplifier for Monitor sound.

- In the Up position, the receiver/amplifier will monitor output from
the Dubbing Buss.
- In the Down position, the receiver/amplifier will monitor output
from Decks 1, 2 and/or 3.


Could somebody please explain what a dubbing buss is and also
translate these instructions so that they make sense to a neophyte?

Thanks very much!

--

[rickman]

I don't see any replies so I give you my two cents worth. I believe the
"dubbing buss" is a common point that any of the sources can be
connected to. There is no amplifier or other active device to combine
the signals, so it is not a great idea to connect more than one at a time.

The lower row of switches description is not entirely clear. I think
they are saying the box has one output to the receiver and when the deck
switch is in the lower position that deck output is connected to the box
output, again this is a common point (bus) and you probably should only
connect one deck at a time.

The right switch allows the output to the receiver to come from either
the dubbing bus or the output bus of the three lower switches.

The rest of the instructions are mostly clear to me. The switches allow
you to connect the various components in the way described. The
receiver output goes to the decks according to how you set the upper
switches which can also select the dubbing bus for the deck inputs. The
receiver output comes from the decks according to which of the lower
switches you flip down and the right hand switch sets the final
selection of output to the receiver to either the output bus or the
dubbing bus.

Does that make sense? If not, maybe a diagram would help, but this
would be hard in ascii art...

Input Bus Lower
Receiver | Upper Switches
-------->| Switches Dubbing Right
Output | Bus Output Switch
| | Bus
|---o o-->| |
| | |
| o <----o-> Deck 1 --o----> o | |
| | |
| o o---|----->| Rcvr
| | | |--o Input
| |----------------------------| | <-----o---
| |------|--o
|---o o-->| |
| | |
| o <----o-> Deck 1 --o----> o | |
| | |
| o o---|----->|
| | | |
| |----------------------------| |
| | |
|---o o-->| |
| | |
| o <----o-> Deck 1 --o----> o | |
| | |
| o o---|----->|
| | | |
| |----------------------------| |
| | |

Rick

[josephkk]

Spot on. Nice ASCII art as well.

?-)

[rickman]

>> | o<----o-> Deck 1 --o----->o | |
>> | | |
>> | o o---|----->| Rcvr
>> | | | +--o Input
>> | -----------------------------+ | <-----o---
>> | +------|--o
>> |---o o-->| |
>> | | |
>> | o<----o-> Deck 2 --o----->o | |
>> | | |
>> | o o---|----->|
>> | | | |
>> | -----------------------------+ |
>> | | |
>> |---o o-->| |
>> | | |
>> | o<----o-> Deck 3 --o----->o | |
>> | | |
>> | o o---|----->|
>> | | | |
>> | -----------------------------+ |

>> | | |
>>
>> Rick
>>
>
> Spot on. Nice ASCII art as well.
>
> ?-)

Not quite spot on. Reviewing it I see the deck numbers were not changed
after I copied the circuit three times. I also should have
distinguished connections vs. crosses better. So the above is updated.

Guess I'm a bit rusty at ASCII art.

--

Rick

[josephkk]

Eh. OK. Still it got the concept across clearly.

?-)