You had problems even if the voltage was in the range allowed by the datasheet? I never tried an amp in ultra linear, all I had was triode strapped.
Tube rolling thread | UltraSonic Studios
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Found some interesting charts here. Maybe this website was known, for me not, so I share it.
Isaacc7
Headphoneus Supremus
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Ultralinear is frequently left off the data sheets. I have to pay attention when I use it because you can almost always run tubes in triode at a higher voltage. My amp is limited in the fact that the lower the b+ I use the less bias current I can use. So it’s a balance between not frying the tube and not frying my voltage regulator.
I wanted to return on big horses with some 6L6 comparing these 2 pairs made by Sylvania. The plan was to see what's different between the clear and grey glass.
But I got bored quickly, I start to miss earlier than expected the EL42. So these will go to storage and we will see someday if I will be patient enough for my 6L6. But this also tells something about how much I like EL42.
But I got bored quickly, I start to miss earlier than expected the EL42. So these will go to storage and we will see someday if I will be patient enough for my 6L6. But this also tells something about how much I like EL42.
The burn in of the Mullard EL42 was incredibly fun, especially in the company of Fivre 6SL7. But soon we will need to put these one against the other. This will be the true battle of the giants here, on Eternity. And the battle will have no winner because there is no winner. These are all exceptional.
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I needed to correct your little mistake. Please forgive me. OCD.
LobalWarming
Headphoneus Supremus
This will be the true battle of the toddler tubes here, on Eternity.
Fixed your FTFY …[ ® ™ ℠; © bcowen: 2021-2023.]
Well, 6C4/CV133 are the toddler tubes...Fixed your FTFY …[ ® ™ ℠; © bcowen: 2021-2023.]
I removed stuff about 6K5. After digging more I cannot use these in my amp. Damn. I need single triodes with high mu (>50) and cannot find yet.
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E88C or EC88?
I have here some E88C and E188CC but are double triodes.
I will explain. This morning I planned to see how I can do more with my single triode sockets (the ones wired for 6J5). I am quite ignorring them for a while because the tube types I like and pair well with what I currently use on output are usually higher mu. So I stick with 6SL7/6N7/ECC40 on the double triode socket (wired for 6SN7). I tried with success and liked EL83 and a possible good path to follow would be EL41. But meanwhile, I wanted to find some single triodes which qualify as a half of 6SL7 or at least have higher mu. 6K5 was looking OK and usable in my 6J7->6J5 adapters but I ignored that the max plate current was around 1mA. So I cannot bias these on my amp where I need at least 2.5mA. I looked to several other types and well, I am unsure about them.
We have a very nice table here which can be sorted to show us some tube types we might consider.
From the table 6K5 was promising, but well. I'll have to dig more here and see what can be used and interesting for me. 6SQ7 was also in my focus but I cannot bias that one either.
We will see, one thing is for sure, my single triode sockets were not used at their full potential and I want to fix that. Of course remaining in the range of 20EUR/tube which I made as a Golden Rule of my activities.
Just for clarification, EC88/E88C are not the same as E188CC. EC88/E88C are single triode with high mu. I have used them to substitute 6SL7 successfully. Another tube I have tried on 6SL7 with success is 6Q7G, a dual diode single triode.I have here some E88C and E188CC but are double triodes.
I will explain. This morning I planned to see how I can do more with my single triode sockets (the ones wired for 6J5). I am quite ignorring them for a while because the tube types I like and pair well with what I currently use on output are usually higher mu. So I stick with 6SL7/6N7/ECC40 on the double triode socket (wired for 6SN7). I tried with success and liked EL83 and a possible good path to follow would be EL41. But meanwhile, I wanted to find some single triodes which qualify as a half of 6SL7 or at least have higher mu. 6K5 was looking OK and usable in my 6J7->6J5 adapters but I ignored that the max plate current was around 1mA. So I cannot bias these on my amp where I need at least 2.5mA. I looked to several other types and well, I am unsure about them.
We have a very nice table here which can be sorted to show us some tube types we might consider.
From the table 6K5 was promising, but well. I'll have to dig more here and see what can be used and interesting for me. 6SQ7 was also in my focus but I cannot bias that one either.
We will see, one thing is for sure, my single triode sockets were not used at their full potential and I want to fix that. Of course remaining in the range of 20EUR/tube which I made as a Golden Rule of my activities.
Marconi DH63 (European equivalent 6Q7G)
Mullard EC88 (Blackburn), Philips E88C (Mullard relabeled), TFK EC88 (Berlin)
Mullard EC88 (Blackburn), Philips E88C (Mullard relabeled), TFK EC88 (Berlin)
LobalWarming
Headphoneus Supremus
Would a mu of 70 do? EC92 - the single plate predecessor of the ECC81. I have a pair of Tele EC92s that I adore. The RFT EC92s are very good as well.
Ah, I know what you say now. Single C not double CC. VERY interesting, mister, you deserve a beer.
EC92, I'll look into that. Also into DH63.
Yes, I try to find out if are there some single triodes with higher mu than 20. Basically to use these single triode sockets with a pair of "something" which will sound as energic as my 6SL7. I do not have something like this, I usually go for double triodes like 6SL7/12AT7. But it seems you saved me. I'll have to check these you told me.
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