[fenbach]

keefer,
do try removing the buffer cap. again, i don't think you even need it with a solid state vibrator.
your value of 682K for the buffer cap is puzzling. maybe you mean 682 uuf? = .00682 uf.
btw, "Of all the old paper capacitors, the buffer capacitor is the capacitor that is most prone to failure. Replacing the buffer capacitor is therefore essential." https://www.justradios.com/buffer.html