Does any one have experience on using 6DQ5s in place of 8236s in the
Hallicrafters SR-500? Not easy to find 8236s new.

Tubes are electrically identical, but the 8236 has a carbon plate.

Perhaps not pushing the transmitter to maximum power and cooling the 6DQ5
with a fan could be OK.

Another possibility would be to replace the 8236s with larger sweep tubes,
such as 6KD6, 6JE6 or 6LQ6. But apart from changing sockets, I should check
whether the bias and screeen voltages are compatible.

Again, any hands-on experience on that?

73

Tony I0JX
Rome, Italy