Operajulian
Julian
Not quite ^. Here is a simplified explanation.
The AP version is the same pre-amp and amp circuit on the main pcb. In itself - it does not then become a power amp.
In the AP there is an additional small pcb mounted by the DIN sockets on the back.
This in effect "splits" out the signal from left and right pre-amp and enables it to be sent via the DIN cable to another device. After the other device has processed it it can return and then be amplified by the amp circuit,
The device could be a graphic equaliser, for example, though I suspect very rarely used for this purpose.
Mostly the signal would have been sent to the inputs of a larger power amp - such as A&R made SA150 or SA200 amps. The A60 is then being used just as a pre-amp ie tone controls and volume.
If not being used for this purpose, A&R had a special shorting DIN plug that just connected the two sides of the pcb - and thus it works as a standard A60.
Alternatively, the signal could go to a special A&R SA60 amp with a crossover card made specially for a very few speakers of that time that were bi-wired. Such as the Arcam One.
The set up then had the A60 drive the treble and bass of one speaker channel and the SA60 drive the treble and bass of the other. I have this set up in my basement and whilst an interesting exercise - its not so wonderful as one might hope. Perhaps that why they did not sell very many of these ?
David's idea is a little complicated but can be done with some electronics experience. Might be fun to do but I expect that there much easier ways of doing this with amps already set up for this.
The AP version is the same pre-amp and amp circuit on the main pcb. In itself - it does not then become a power amp.
In the AP there is an additional small pcb mounted by the DIN sockets on the back.
This in effect "splits" out the signal from left and right pre-amp and enables it to be sent via the DIN cable to another device. After the other device has processed it it can return and then be amplified by the amp circuit,
The device could be a graphic equaliser, for example, though I suspect very rarely used for this purpose.
Mostly the signal would have been sent to the inputs of a larger power amp - such as A&R made SA150 or SA200 amps. The A60 is then being used just as a pre-amp ie tone controls and volume.
If not being used for this purpose, A&R had a special shorting DIN plug that just connected the two sides of the pcb - and thus it works as a standard A60.
Alternatively, the signal could go to a special A&R SA60 amp with a crossover card made specially for a very few speakers of that time that were bi-wired. Such as the Arcam One.
The set up then had the A60 drive the treble and bass of one speaker channel and the SA60 drive the treble and bass of the other. I have this set up in my basement and whilst an interesting exercise - its not so wonderful as one might hope. Perhaps that why they did not sell very many of these ?
David's idea is a little complicated but can be done with some electronics experience. Might be fun to do but I expect that there much easier ways of doing this with amps already set up for this.
