I am following up with this update and, embarrassingly, an apology. The real culprit to my amp problems turned out to the a malfunctioning power conditioner. The one used throughout my ordeal was a Audio Magic Stealth, a unit bought in the 90’s, in storage for ten years, and brought back into service 3 years ago. Since two Von Gaylord amps malfunctioned, I put the blame on the Manufacturer. Furthermore, after the VG amp was sent back for repair, I had a loaner tube amp, International Projector Corp am 1026, in service which had performed flawlessly. Well.... the IPS amp also malfunctioned about two months ago.
Someone finally suggested that I look into the power conditioner. When I open the box, alkaline deposits were found adhering to wire connectors, and parts were flacking off. The power conditioner had probably not been maintaining proper voltage for a while. To be clear, I am not pointing fingers at Audio Magic. The alkaline deposits are common occurrences from electronic devices and batteries due to the high humidity of where I live. I believe now that putting expensive audio equipment in storage in high humidity environment is asking for trouble.
I have a new power conditioner, Puritan Audio PSM 156, and a new amp, Mactone MH 300b for a month. And things are fine. Previously, the Wadia CDP would from time to time turn itself on when in sleep mode. It was again a problem that I did not associate with the power conditioner. The Wadia does not act up anymore.
Von Gaylord fixed the amp for $900. They will return in two weeks. And they will work with the new Mactone to bi -amp the Eminent Technology LFT-8 bs.
I have sorry to place blame on Von Gaylord Audio when the problem really was due to my carelessness.