Early Quad 34 need to use tape in and out together

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08-May-2017 08:29 PM

Not Available

Posts: 3

Hello

I have an early quad 34 ( about no 3850) and need to use its tape output as a take off for a headphone amp, but I also need to use its tape input at the same time. Is there a simple mod I could do. I will never need a tape recorder. Or is a dedicated take off mod possible and how.

Thanks

diode84

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09-May-2017 08:11 AM

Joost Plugge

Joost Plugge

Posts: 943

It depends....On the tape out there is always the selected input, Radio, Aux (CD) or Phono. When you push the tape button, the selected input will stay on the tape out for recording, but the tape input signal will be feed in to the pre-amp for monitoring. So if the Tape input is used as a fourth input, it will work, but if you need this fourth input also on the Tape out, it is not possible. You have to use a outside switch facility. We can sort this out under the Engineering umbrella, but we need a assignment.

Joost Plugge

DaDa Engineering

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09-May-2017 09:56 AM

Not Available

Posts: 3

Hello

I dont understand what you mean by an assignment.

I was wondering if I could permanently switch on ic1, pins 1and 2 and pins 10 and 11  so selected input would go to preamp and to take off.

I wont ever need to run a tape recorder.

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09-May-2017 02:51 PM

EJP

EJP

Posts: 1412

See the owners' manual. You can insert the links X1 and X2 to make the CD socket into a second tape output. However, the tape monitor input is designed to interrupt the other inputs, and the tape monitor output can only be connected to Radio, CD, or Disc, by definition. Maybe the switching logic can be altered but it is hard to see the point. All you really need is a splitter cable.
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09-May-2017 04:33 PM

Not Available

Posts: 3

Hello

At the moment I have four inputs to the 34, disc,  radio, CD and music server which I have on the tape input. I would like to take an audio out from whichever of the four is selected for a headphone amplifier.

Modifying the logic circuit seemed the only way and that is why I could do with help.

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10-May-2017 02:14 AM

EJP

EJP

Posts: 1412

Probably off topic but you can do this with a Quad 44.
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11-May-2017 07:53 AM

Joost Plugge

Joost Plugge

Posts: 943

The problem is, the tape input, when selected, should act as a normal input, switching the others 'off'. This can only be done by changing the logic, as Not Available allready mentioned. To my knowledge, there is no easy solution, we can sort this out, but only with some form of assignment.

A Quad 44 has 5 inputs...as EJP said.


Joost Plugge

DaDa Engineering

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11-May-2017 03:29 PM

Joost Plugge

Joost Plugge

Posts: 943

A quick and dirty way........

This aplies to circuit diagram iss 2, but the idea is the same for the other versions.

If you connect the input of Ic3 and 4 to pin 2 and pin 10 instead of pin 1 and 11of Ic1, the tape out will follow all the selected inputs. When the tape in is selected the two switches of Ic1 prohibit the mixing of the 'normal' inputs with the tape in. A disadvantage of this method is that the selected input led (Radio, Phono or CD) continues to light up.

Joost Plugge

DaDa Engineering

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