[JazzVinyl]

 
Does anyone with the adapters want a free set of 1635 to try LOL. Just remember don't blame me if you shrink Elise.

 
I have the adapters coming.
 
Sure I'll try 'em....be not afraid
 
 
PM sent
 
.

 

[UntilThen]

OK JV has volunteered to be the guinea ....remember if they are better than ECC31 send it back my way again LOL. Just kidding. It's yours to enjoy or moan hahahaha. Please please check with Lukasz first. I don't want you to destroy your Elise.

 

[hypnos1]

Update on the mind-scrambling front...anyone out there with some DIY ability wanting to 'have a go' MUST AT ALL COSTS get hold of some FDD20s - with another 20+ hours on them they are now AT LEAST AS GOOD AS THE ECC31s, with a nice dash of C3g magic thrown in!...especially its treble, MINUS JV's "metallic" element.
 
My suspicions have materialised big time...bass is now pretty well a match for the 31s, and the mids have come through just the same. And to a degree I never imagined possible...to say I am totally blown away (yet again!) is the understatement of the year. To be honest, I was not expecting such a dramatic change/improvement. And all for the paltry sum of 8 Euros each...thanks to mordy's steering to a German ebayer's listing of 3 tubes for 25 Euros, which although listed as 'used' come wrapped in original packaging with unbroken securing label!!
 
I apologise profusely for ranting like this about a tube that isn't appropriate for most folks, but I just had to share the utter joy, amazement and disbelief I am presently experiencing...sorry...

 

[JazzVinyl]

  OK JV has volunteered to be the guinea ....remember if they are better than ECC31 send it back my way again LOL. Just kidding. It's yours to enjoy or moan hahahaha. Please please check with Lukasz first. I don't want you to destroy your Elise.

 
Based on G's comments above, I have no fear. 
If the gain is more than Elise can handle, it should be apparent in the sound, very quickly.  I have a $20.00 pair of 6080's I can use when first trying.
 
Whenever I have asked Lukasz about unapproved tubes, he replies:  "Not tested, and not on the approved list".  I'm sure they are too busy assembling amps to test all the tubs that nutty tube rollers' come up with
 
.

 

[JazzVinyl]

  Update on the mind-scrambling front...anyone out there with some DIY ability wanting to 'have a go' MUST AT ALL COSTS get hold of some FDD20s - with another 20+ hours on them they are now AT LEAST AS GOOD AS THE ECC31s, with a nice dash of C3g magic thrown in!...especially its treble, MINUS JV's "metallic" element.
 
My suspicions have materialised big time...bass is now pretty well a match for the 31s, and the mids have come through just the same. And to a degree I never imagined possible...to say I am totally blown away (yet again!) is the understatement of the year. To be honest, I was not expecting such a dramatic change/improvement. And all for the paltry sum of 8 Euros each...thanks to mordy's steering to a German ebayer's listing of 3 tubes for 25 Euros, which although listed as 'used' come wrapped in original packaging with unbroken securing label!!
 
I apologise profusely for ranting like this about a tube that isn't appropriate for most folks, but I just had to share the utter joy, amazement and disbelief I am presently experiencing...sorry...

 
No apologies needed and I believe you are having a "Joybringer" moment!  I feel the same about 6N7G (in ST envelope) - I like the GM's better than the older French one's...they have a bottom note that is thicker/fuller...
 
Yeah for US brave ones
And yes, thanks, Mordy
 
.

 

[UntilThen]

Hypnos1 I'm not following you on this one even though I have a specialised car battery from the days of competing in car sound systems.

 

[JazzVinyl]

  Hypnos1 I'm not following you on this one even though I have a specialised car battery from the days of competing in car sound systems.

 
H1's FDD20 is said to be the 6N7G (in ST envelope) but with a 12v heater and very different base.  He made a custom adapter to enable external heating, so he could use it in the Elise.
 
.

 

[UntilThen]

Yes he's doing some ingenious stuff there. I'm quite happy for the spotlight to be shifted away from ECC31 so that the price will drop.

 

[MIKELAP]

 

 
ps. Re my reply to gibosi concerning the 1635, I personally would check with Lukasz about that VERY high gain...just not worth taking any more chances than we already are, lol!

 
Do you know what the mu of the 1635 is? I don't see it on the RCA data sheet....
 
Interestingly, the 6N7 was also described as having a high gain, but again, I do not see a a value for mu on 6N7 datasheets. The ECC31 (and ECC32) has a mu of around 35. My best guess is that when these tubes were developed, a tube with a mu of about 35 was considered to have a high gain. Given that the 1635, 6N7 and ECC31 are considered to be very similar, my guess is they all have about the same mu, around 35. 

                                                                                                                                                                                                                                                                                                                                                                                                                                            

 

[UntilThen]

My den 

 

 

[gibosi]

Yes, I missed seeing the mu of 65 for the 1635 on the Radiomuseum's page. But what I don't understand is where did they find that value? It does not appear on RCA's datasheet and this is the only datasheet I can find online:
 
http://www.shinjo.info/frank/sheets/049/1/1635.pdf
 
But even if the mu is 65, the 6SL7 has a  mu of 70 and it works fine in my Glenn OTL and other similar 6SN7/6AS7 amps. And therefore, I can't imagine that running 6SL7s in the Elise could possibly present a problem. Ask Lukasz if the 6SL7 is OK in the Elise. And if it is, the 1635 will be fine as well.

 

[MIKELAP]

  Yes, I missed seeing the mu of 65 for the 1635 on the Radiomuseum's page. But what I don't understand is where did they find that value? It does not appear on RCA's datasheet and this is the only datasheet I can find online:
 
http://www.shinjo.info/frank/sheets/049/1/1635.pdf
 
But even if the mu is 65, the 6SL7 has a  mu of 70 and it works fine in my Glenn OTL and other similar 6SN7/6AS7 amps. And therefore, I can't imagine that running 6SL7s in the Elise could possibly present a problem. Ask Lukasz if the 6SL7 is OK in the Elise. And if it is, the 1635 will be fine as well.

 

[JazzVinyl]

Here is another "Joybringer's cousin" that can probably be used:
 
http://vinylsavor.blogspot.com/2013/02/tube-of-month-6a6.html
 
Uses a 7 pin base....I see no commercially available adapters, however...
 
--JV--

 

[nephilim]

 
ive been using some tubes with glass particles inside for a year now and they are still working fine

Thanks Mike. That would sort out the debris. Regarding the speckles the seller told me 
 
"Actually the white freckles on the inside of the tubes are a by product of the regimented testing the tubes undertake.

The tiny white specks are inert silicate flakes from the mica nearest the top getter - which has been heated during testing."
 
Does this make sense?
 
And what about the faint / almost translucent getter flash?
 
It does sound good, though )

 

[agnostic1er]

Hi guys,
 
A few impressions about my new tubes:
First the 6080 Sylvanias power tubes: frankly, using the same drivers, I could'nt hear any differences between them and the stock Svetlana 6AS7G (6N13S); perhaps a bit of extended treble range from the Svetlana but not sure at all...
 
Now, about the Foton 6N8S drivers: those are very different from my Jan Sylvania 6SN7 WGTA selected by Lukasz: sub-bass is a tad lower in level, bass is on par but treble is at the same time a bit recessed and a bit less extended; the main difference is in the middle range: foton are a bit more dynamical and above all much more present, particularly in the middle and high-mids; this translates in a better transition with the treble range and gives the voices and all the instruments tones a more vivid and strong presentation; in conjunction with my HD800 this gives much more presence and this character pleases me a lot even if the global sound is a tad less airy and refined.
So, given that these Foton are somewhere similar but less renowned than 50's metal base Melz, I ordered a pair of those ( used but test strong for only 35$) ; they will come at my home soon.
So stay tuned!