Thanks for the response. A firecracker for sure. No the Opera Cyber 211 amp has no protection circuit. The tube shorted. Since the amp has no protection circuit and the tubes have a history IMO Grant Fidelity should have never sold me the tubes. They sell the Amp as well.
My NOS tubes have zero issues were less expensive and are still going strong. Never again.
Thanks for the link, I will have my tech take a look and design a protection circuit. Are you in the US ?
charles
|