[Texasrocker]

I have found that 10-watt wirewound ceramic resistors are more than adequate in replacing field-coils. They take up less space, & I have never had one fail yet in many of my sets that I play on a regular basis after many,many hrs of service. The 10-watters run abit warmer, but hold just fine. They can be mounted on terminal-strips in spaces where extra room is at a premium. However, if you have the extra space, the 20 watters run abit cooler. In some cases, a 10-watter can be soldered directly across the old spkr 4-pin chassis/spkr connector underneath the chassis, and will be hidden, allowing use of the old spkr wire harness. Just make sure the wires are cut that originally used the old field-coil. Just my .02