I am at last making good progress repairing a blown output channel thanks to the manual from this site. I have replaced about half of the transistors/FETs and some resistors in this stage/channel. The channel is now producing output but one transistors TR513 is getting hot. I found a fusible resistor R525 is open circuit. I would like to replace it with the correct type of 330 ohm fusible resistor if possible but can't find a supplier. The manual states "Part No. 241 2315 983 Part Name Fusible resistor 330 ohm 1/4W Remark RD14B2E331GFRST ". Where or from who can I get these resistors?