Coronado 962A - Printable Version

+- The PHILCO Phorum (https://philcoradio.com/phorum)
+-- Forum: Various and Sundry Categories (https://philcoradio.com/phorum/forumdisplay.php?fid=37)
+--- Forum: Other Radios (Non-Philco) (https://philcoradio.com/phorum/forumdisplay.php?fid=12)
+--- Thread: Coronado 962A (/showthread.php?tid=25134)

---

Coronado 962A - RodB - 07-17-2024

I'm looking at replacing an output transformer for this farm radio. It has 2 1Q5s in parallel driving a SE OPT. The 1Q5 has a suggested plate load of 8k. If the tubes are in parallel then can I be okay using an OPT with a 4K primary impedance?

---

RE: Coronado 962A - Arran - 07-17-2024

Just out of curiosity is there an economy switch that shuts off one of the 1Q5 tubes to save on battery life? I couldn't find a 962A on N.A only a 962 so I assume it's similar. I think you would be right about the plate load impedance being 4000 Ohms, but I'm sure someone else will chime in.
Regards
Arran

---

RE: Coronado 962A - RodB - 07-17-2024

There doesn't seem to be a switch to turn off one of the 1Q5s. The schematic at NA is the correct one. The A suffix is for speaker size as noted in the schematic.

---