12-30-2025, 01:22 PM
There is a theory that Line matching transformers cannot handle the DC component, but several Phorum members use them as output transformers with no issue.
For 42, 2A5 and 6F6 (all the same tube except for basing and, in the case of the 2A5, heater voltage, single ended plate resistance (transformer primary impedance) is 7,000 Ohms at either 250 or 285V. 6V6, 6BQ5 and 6AQ5 are around 5K Ohm. AA5 Output tubes (25L6, 35L6, 50L6, 50C5, etc. are around 2.5K
For 42, 2A5 and 6F6 (all the same tube except for basing and, in the case of the 2A5, heater voltage, single ended plate resistance (transformer primary impedance) is 7,000 Ohms at either 250 or 285V. 6V6, 6BQ5 and 6AQ5 are around 5K Ohm. AA5 Output tubes (25L6, 35L6, 50L6, 50C5, etc. are around 2.5K
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
"Let us begin to do good"- St. Francis
Best Regards,
MrFixr55
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
