Looking forward to hearing your thoughts

I don't think Ive come across an 807 I don't like , these are Hytron JAN VT100 807 made in 1944, they have a lovely semi transparent grey glass and sound wonderfull . Especially with vocals like in this track , no idea what she's singing about but it sounds beautiful . Tung Sol 6BW4, HYTRON 807...

Very nice looking adapter. How do those Haltron 807 sound ?

Lovely, I have have been looking for a Pair of GEC KT88 for ages , most are too much $$$ or too used :pray:

T They are wonderfull drivers , I don't have that straight glass version but the 3 versions I have all sound great

OK that's good news , I have 2 different ECC35's and will try them with KT63

What a fantastic comparison, I only have the Atrium Opens and this compels me to listen to these same songs to see what I can hear :gs1000smile:

Thanks for this advice , so the problem is with the EL81 tube , not the adapter ? It's just strange that it happened with both pairs that are very different . Also why would the mA vary so much , is that also part of the resonance problem ?

I think its some sort of ground fault in the adapter, when i touch the top cap on adapter the loud hum disappears , also when a multimeter touches the test points the hum comes back and mA goes up to 65-70 , tubes got very hot also . Removed the EL81 from amp and will order some new adapters...

yep , its really weird , I wonder if its the adapters ? Not sure how to diagnose the problem

Yesterday I tried my EL81 tubes in UltimatE , with both pairs the mA went up to around 70 and I got very loud hum , it was unlistenable . Can anyone explain what may be the problem ?

OK , I will leave them to run in and see if they change

They sound wonderfull , great tone , base is good , vocals sound excellent , however there is a difference in the balance , the vocals shift to the left and the left tube is biasing at 39mA and the right at 35mA . It's a shame as apart from that they sound excellent . I will look for another GEC...

That was me , I received the replacement but Langrex ran out of the the GEC Black glass and so sent me a grey glass , I am not sure if they are exactly the same tube internally but they look to be . Hopefully they are OK to be used together , I will try later today and let you know. :gs1000smile:

These just arrived ,looking forward to hearing them and see how they compare to my 807’s 👍

I spoke with @Zachik and asked if he would grant me permission to edit and/or take over the Tube compatibility spreadsheet and he said - "Sorry mate - I prefer to avoid "too many cooks in the kitchen"... If you want me to add specific tubes that were verified - please PM me." So its all good ...

OH has he , shame . I have a crap memory and find it invaluable . Might try to do it myself

Hopefully @Zachik gets some free time and can update the wonderfull Tube Compatibility spreadsheet with all these 807 variants . https://docs.google.com/spreadsheets/d/1D_XLHXI8a994dEhi3A7WjDdxA0ryyaGh4MXt2mOf6Vg/edit#gid=0

LOL, yep 807 is much easier :gs1000smile:

Yes , my bad just corrected

Received my replacement 5B/254A adapter today from Xulingmrs and so can finally listen to these great sounding tubes . They have wonderfull clarity and punch . Sound excellent with Acoustic music like this album , I love the version of Queens Under Pressure by Shawn Mendes, check it out on qobuz...

Wow , hes awesome , cheers for the recommendation :beerchug:

AH , OK thanks, that explains it :thumbsup:

Thanks , will check him out

My Siemens EL11 arrived today and are sounding great , very close in sound IMO to my EL12 spez Telefunkin , maybe not quite as good in the low end . Sounds perfect with some classic Blues . Bobby Rush. This legend is 90 and still touring and recording albums . Legend !! Marconi EZ81/U709, RCA...