Yes as a matter of fact. I couldn't find the problem with my QMX Mid-band, so I sent it to Jeff, the renowned QRP Labs Repairman here in the states. Along with a cracked capacitor, he reported R520 being the wrong value also. I too, rewound T507 several times. Maybe it should be put on the check list of things to check before building. It's on it's way back to me and I can't wait to try it out.
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73
James
James