68 sounds right, if i recall, the 200 was not a product in 1965...
could you post pictures of your amp?
You might want to take it to a tech and have it properly grounded.
This time it was a short between you and the mic... next time it could be worse.
And the job to have it done will be much cheaper regardless, than say, you being in the hospital for any amount of time... or worse.
Don't play around with electricity.
