Kassandra II Ref E280F options
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I believe that the vast majority of Valvo branded E280F’s were manufactured at the Philips plant In Hamburg Brad .
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Ok, I always got Siemens from you and thought that was all there is…assume then that you consider the Siemens to be the best sounding?
It is not that straight forward.
From our internal grading system, (from 1-10)
Siemens get 1-10
Mullard 2-8
Tele 2-8
Phillips 2-7
Valvo 1-8
Various rebrands 1-4
So you see there is huge overlap. You cannot generalize about brands. You can get Siemens ranging from 1 to 10.
To clarify, even a grade 1 is still fantastically sounding tube, but, there are grades above that
Dates and factories(Siemens had more than one) play significant factor.
Cheers
S
Thank you for the information. Could you expand on what the ratings mean? How do you identify the rating on the tube and what grade are in your products. I have a Kassandra II Reference and know what tube came with it but I don't recall any ratings on the box or tube.It is not that straight forward.
From our internal grading system, (from 1-10)
Siemens get 1-10
Mullard 2-8
Tele 2-8
Phillips 2-7
Valvo 1-8
Various rebrands 1-4
So you see there is huge overlap. You cannot generalize about brands. You can get Siemens ranging from 1 to 10.
To clarify, even a grade 1 is still fantastically sounding tube, but, there are grades above that
Dates and factories(Siemens had more than one) play significant factor.
Cheers
S
Curious about this family of E280F, E810F, etc. tubes and hope a knowledgeable member could give me a little background. Are these tubes used by any other audio amp builders you are aware of? Additionally, would the Exx0F tube family be sought after by ham radio operators or guitar amp makers? Aside from Aries Cerat owners, I’m just wondering who else would be buying or selling these tubes. Thanks.
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I only know , allnic audio,thomas mayer, silvercore audio use e 280f/D3a /el862 tube mostly phono gain stage.i dont know any guitar amps or other buyable devices.
Here this are siemens tubes from early 1970
SIEMENS E280F / 7722
SIEMENS E280F / 7722 W. Germany A special quality pentode similar to D3a. These have triple mica with gold pins. Can be used in triode...
Product - BTB - Elektronik
EL862 (=D3a, ~E280F) Pentode Noval B9A 9-Pin tube-valve-base-Röhrensockel EL 862 (=D3a, ~E280F) Pentode
btb-elektronik.de
StavrosIt is not that straight forward.
From our internal grading system, (from 1-10)
Siemens get 1-10
Mullard 2-8
Tele 2-8
Phillips 2-7
Valvo 1-8
Various rebrands 1-4
So you see there is huge overlap. You cannot generalize about brands. You can get Siemens ranging from 1 to 10.
To clarify, even a grade 1 is still fantastically sounding tube, but, there are grades above that
Dates and factories(Siemens had more than one) play significant factor.
Cheers
S
Can you please elaborate more information on your grading scale? I don't understand what it means. thank you.
Thank you for sharing the information and the helpful links! I’m going to look into these 2 sources.I only know , allnic audio,thomas mayer, silvercore audio use e 280f/D3a /el862 tube mostly phono gain stage.i dont know any guitar amps or other buyable devices.
Here this are siemens tubes from early 1970
Here write a email for priceSIEMENS E280F / 7722
SIEMENS E280F / 7722 W. Germany A special quality pentode similar to D3a. These have triple mica with gold pins. Can be used in triode...www.nostubestore.com
Product - BTB - Elektronik
EL862 (=D3a, ~E280F) Pentode Noval B9A 9-Pin tube-valve-base-Röhrensockel EL 862 (=D3a, ~E280F) Pentode
The Red Series only Hamburg,Valvo
other white labeled valo mostly by philips ,heerlen netherlands thats what i know.
Blue series are too rare to find .top quality line over 10000hrs gurantee with p factor 1%
Exsample tube
Hello Will
It is general SQ grading system, we use internally in the company. The take-home point i wanted to give with the example, is to not over-obsess with Brands of the particular family of tubes, as there is a great overlap , in other words, a Siemens can sound better than a Mullard, and the other way around.
Just use your ears for evaluating , when tube rolling brands, and keep what you like. After playing with bias that is (many will have different bias sweet spot than the next one).
Cheers
Stavros
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