Elrog 300B vs Takatsuki 300B tubes

Hi All,
Read through all 13 pages with interest and fascination and thanks to all who shared their insights. I have the Franks and CSL that I recently switched up to PSVANE WE replicas. Been running them for two month with about 200 hours on them. They have been spectacular IMHO. A friend told me about the Elrogs and looked them up and was led me to this thread. My question would be did Thomas Mayers recent acquisition of the Elrog works fix the 300B issues. According to his blog he is selling out all current production tubes and have no quality issues except for shipping damage. 2nd, I am wondering with charles1dad, with the all the heartbreaking issues he has had with the Elrogs in his Franks if tried putting back the original spec rectifier tubes. The Franks use 5U4GB and Isreal says they are different than even 5U4G. I believe he said 5U4GB takes more current. Charles mentions he is using nos Mullard GZ37, how compatible/reliable are they? Have other Frank users had similar unfortunate experience as charles with the latest batch of Elrog 300B?

Regards
  

Thomas Mayer says that the current Elrogs have been substantially improved and is backing it up with a 1 year warranty. I may at some future date revisit this 300b tube given the extended warranty period,  I'm in no hurry  and am currently really enjoying the EML XLS  which seems to be bullet proof with my Frankenstein. 

To the best of my knowledge the Millard GZ37 is a drop in replacement rectifier tube.   I've used it for nearly 2 years and have not encountered any problems so far. ecx123 I hope you are enjoying the Frankenstein and the CSL pairing as much as I am.
Charles 

Ecx123 2-25-2017
The Franks use 5U4GB and Isreal says they are different than even 5U4G. I believe he said 5U4GB takes more current.

A 5U4GB can **handle** a somewhat greater output current load than a 5U4G, but their specs are otherwise pretty similar.  The website description of the Franks Mk II indicates 5U4G, however.  Perhaps the description isn't up to date.

A 5U4GB will just about always be a suitable substitute for a 5U4G.  A 5U4G will be substitutable for a 5U4GB in some designs but not in others.

Charles1dad 2-25-2017
To the best of my knowledge the Millard GZ37 is a drop in replacement rectifier tube.  

The GZ37 is equivalent to a 5AR4.  It will often and perhaps usually be a suitable substitute for a 5U4G, and it will be a suitable substitute for a 5U4GB in some designs but not in others.  There was some discussion of the 5AR4 near the bottom of page 9 and near the top of page 10 of this thread.  (Those page numbers apply if posts are sorted most recent last).

Best regards,
-- Al
 

In the Coincident manual for the Franks, it specifically says uses 5u4gb and don't use 5u4g. Before reading the manual I did roll some 5u4g tubes in because they looked cooler with their bottle shape. One amp stopped functioning shortly after but luckily it was just a blown fuse. When I inquired with Isreal he referred me to manual and said use 5u4gb only. Was blown fuse the result of the 5u4g?Cant say for sure. Interestingly on EML spec on note 4 it says they are not the same:
http://www.emissionlabs.com/datasheets/EML5U4G.htm
I guess it is a case of it works until it doesn't.

Very much loving the Coincident Franks and CSL. Actually got the Statement Phono first and loved that, then decided to go all in. Big improvement on CSL and Franks w PSVANE WE replicas. Will be ordering the Elrogs next week to see how much better it can get.