So excuse my ignorance as smaller electronics is not my strong suit. The output of the xfmr is connected to 2 x 80 V DC capacitors. So assuming whatever xfmr I get, as long as it is < 160 V DC, then I should be good to test with?
Transformers are AC, not DC.
simulate this circuit – Schematic created using CircuitLab
Figure 1. Centre-tapped transformer, bridge rectifier and smoothing capacitors.
- The transformer is centre-tapped to provide a symmetrical power supply with a positive voltage rail and a negative power rail.
- When AC voltage is rectified and smoothed the DC voltage can reach \$ \sqrt 2 \$ times the transformer voltage.
- The 80 V rating of the capacitors may be just the next standard voltage above the DC output voltage.
I would be surprised if the voltage was much more than ±50 V. If that was the case the transformer would be something like 35 - 0 - 35 V.
I hope you can see that your idea of a 160 V transformer would have been disastrous. You haven't given the power rating of the amplifier, the ratings label or the impedance of the loadspeaker so it is not possible to estimate the likely current requirement.