QED Tape switching unit type 23/2b

[sourbiscuits]

Hi guys. This might not be in the right sub. I apologize if so, but feel free to move it.

I found this unit today in the thrift store and I've been trying to figure out how it works. I thought it may be helpful to ask in the forum. I attached photos.

[Analogue man]

It allow the connection of up to three tape recorders and one amplifier without the bother of plugging and unplugging you can record on one machine whilst listening to another record on more than one machine or even copy from one machine to another whilst listening to a third.

[sourbiscuits]

Hi Graham. Thanks for the response. A few things I don't understand about the layout of this device:

1. The switches are labeled Record 1-2 / 1-3 Source 1-2 / Amp-3 Monitor 1-2 / 1-3 while in the back the RCA ins/outs are 1,3,4,5. How do the switches correspond to the RCAs?

2. If I have two stereo tape decks I want to feed the signal of to the tape switch I do line out from decks to tape inputs 1 and 2 for example of the tape switch. I notice there are outs for every group. How do I use the switches to hear the outputs for both tape 1 and 2?

I am mostly confused by the labeling of the RCA compared to the switches. I can't make sense of it and how to configure them.

[TonyDuell]

I think that the numbers by the RCA phono sockets correspond to the pins you'd connect them to on a 5 pin DIN plug (!). That explains the lack of '2' in the socket numbering which would be earth/ground on the DIN plug.

I think the switch numbers correspond to the groups of sockets for tape recorders 1,2,3

I would be very suprised if there was much inside it. It should be easy enough to open it up and trace out the wiring which should reveal all.

[knobtwiddler]

If you can't find a block diagram, simply plug in a couple of RCA leads and use a continuity bleeper to work out what feeds what. You want to hope that it has decent sealing on the switches / gold plated contacts, as at this age contacts could go intermittent (assuming you plan to use it) without a clean. Springs can lose tension as well.

[quiberon]

While this is not the same model the connections and operation are the same, you can download this guide from the QED website;

https://support.qed.co.uk/portal/en/...it-user-manual

This should allow you operate the switching unit successfully.

[sourbiscuits]

Thank you quiberon! I spent some time playing around with it but this will definitely help out. I already managed to feed audio through it but I have not yet completely figured it out.

[Restoration73]

Your amplifier must have a tape monitor switch (that would normally be used with a
3-head tape deck) to get the best use of this unit.