Elrog 300B vs Takatsuki 300B tubes

Brownsfan, on the most current model the HT fuse is external. To be safe, I would ask a technician to evaluate your Frankenstein to make certain the tube's failure did not compromise your amplifier.

Bill,
If it's any consolation my Frankenst MK II (purchased 2009) is much older than yours. Fortunately I suffered no amplifier damage when the original Elrog went bad. I just popped in an EML and all was fine.
Charles,

Unfortunately, the prudent thing is probably to wait until the dust settles and Elrog solves the problem. I am rather impressed that Elrog produced a pair to match Charles' amp. Charles, did Elrog make a pair to your specs? Or did they cull their supply to identify the right pair. As I understand it, there is a certain variability in actual specs for all tubes - a typical bell-shaped curve.

Hi Gary,
I'm not sure of what method of selection they utilized(existing tubes or new batch). My suspicion is new specific batch. I was assured my replacement Elrogs were specifically matched to the Frankenstein MK II operating parameters ( my original pair weren't matched in this manner).
Charles,

Tmm, Thanks. As I stated earler, once the tube failed I replaced it with one of my stand by Psvanes, and the amp appeared to function normally.

Gsm, I am patiently waiting for a response from Matthais or another representative from Elrog in this forum.

When I originally ordered the tubes, I told the vendor the tubes were to be used in a Coincident Frankenstein application, and when Charles' tube failed, I alerted both my dealer and Matthais of my concern, so I did everything possible on my part. As I feared (see my post of 7/7/15 above), the tube failed at 2 days post warranty.