Elrog 300B vs Takatsuki 300B tubes

I know of 2 systems that run Audio Note with Takatsuki with good results. One has 2 tubes per channel, 4 total, for about two years and had Western Electric prior to Takatsuki. The other system has 2 tubes for over a year. I don't remember AN's models, but can dig up the info if needed. I have both Coincident Frankenstein MK2 and Border Patrol amps, both are great with Takatsuki.

Any of you people in Chicago . I have 4 300b amps and tend to use EML
solid and mesh plates . Two amps are transformer  coupled. I would Like to hear a pair of elrogs.
my phone 708 645 1237
cell 708 446 7576
thanks Rick Berta

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