ARC Ref 3: Tung-Sol 6550 in power supply?

hello forum members ,my local dealer supplied me a Tung-sol NOS 6L6WGB to try in my REF 3 , now the tube is 120 hrs in the amp .I like this upgrade . some month ago I also changed the other tubes to 6H30P-DR . This alltogether
made my REF 3 in my opinion a more musical machine .later on I will tell you the major upgrade my local dealer did in the REF 3 .This upgrade takes some more breakin time.
greetings from Holland Hans

Dear all,

I encountered an issue. After replacing the Svetlana with a Tung-sol 6550 Black Plate I experienced sometimes a moment without sound. After some time the sound came back (black-out?). Now my REF3 is dead. I replaced the Tung-sol with the original Svetlana and still no music! I checked everything including connections etc. What can have happened?

Try replacing also the 6h30 in the power supply - perhaps a failure in the Tung-sol 6550 has damaged also the driver tube.

I have to replace all 250 hours the 6L6GC in my powersupply. The sound becomes liveless. What's wrong?

Probably the 6L6GC aged prematurely. It is worth pointing out that any deviation from the ARC supplied SED Winged 6650C may potentially be an "interesting experiments" yielding unpredictable results. . . and any problems it yields may void the factory warranty. G.