i luvmusic 2
New member
You are most welcome!BTW i'am still using the 6H8C i bought more for spare.boulos said:
SEX tubes
- Thread starter i luvmusic 2
- Start date
i luvmusic 2
New member
Maybe not but i like the sound of it,I have plenty of this anyway so it doesn't bother me.
Paul Joppa
Moderator
One of the great things about building a kit is that you can probably fix it if something breaks ... :^)
proud indian
New member
To sum up it means that 6sn7gt cannot be used but the gta and gtb can. This would be a shame as I have six cryoed mullard 6sn7gt with me, which I have no use for. I was hoping I could use it here.
Shreekant
Shreekant
You would not want to use premium 6SN7's in this application. This is experimental, and likely will reduce the effective lifetime of the tubes used.
i luvmusic 2
New member
I finally replaced my 6H8C that i've been using for some time with this SYLVANIA 8SN7GTB i was not expecting much from this Sylvania 8SN7GTB but WOW!Sound smooth i'am loving it so far. ;D
i luvmusic 2
New member
It's 8SN7GTB........I like it.
Paul Joppa
Moderator
The 8SN7 wants 8.4v heater power; it might be prudent to measure the voltage at the socket. If it's less than 7.5 volts, the cathode is not likely to last long.
That same voltage for the 6SN7 may be a little high due to the reduced current demand - worth checking if you are running these tubes long-term.
The low frequency extension (-3dB at 35Hz if I read the plot correctly) is probably affected by the higher plate resistance; experimenting with a larger parafeed capacitor might prove interesting. Was this measurement made with an 8-ohm load on the 8-ohm tap?
That same voltage for the 6SN7 may be a little high due to the reduced current demand - worth checking if you are running these tubes long-term.
The low frequency extension (-3dB at 35Hz if I read the plot correctly) is probably affected by the higher plate resistance; experimenting with a larger parafeed capacitor might prove interesting. Was this measurement made with an 8-ohm load on the 8-ohm tap?
Paul Joppa said:
Alright, I'm in - I've got a pair of TS 6SN7GTB, and feel like experimenting.
You'll not find any measurements here - I'm a drummer, not an engineer - and, lack the necessary skills and equipment (fairly certain hitting the SEX with sticks will not help), but I'll log the hours and sound quality as I go.
Alright - after about 24 hours of play time on these new prod Tung Sol 6SN7GTB...
This comes out of extended listening, while working.
I perceived slightly more gain than the RCA 6DN7 I've been using. Kept the volume set while testing. More air/sparkle and perhaps more touch and presence in the mids. This may just be new vs old tubes? Or, maybe there's a subtle upper and mid forward shift combined with rolled off low freqs, with these 6SN7.
At times, I heard an unnatural edge (tizzy) on cymbals - not great. Over hours of listening, they generally sounded too lean and bright. This is something the amp excels at in its stock form, and in my system - natural sounding acoustic instruments. Could be this bright edge would subside with more time.
The low end is less extended and defined with the 6SN7. Pretty significant loss there.
Went back to the stock pair and it reminds me how much I like this amp.
All good. For me, this is the point - perspective.
I'll keep playing with the 6SN7 off and on - maybe more play time will help.
I am more interested in the coming cap upgrades.
I should add that the 6SN7 sounded good in general - not all bad.
Finally - the hum I'd battled with a minor mod recently was louder with these tubes.
This comes out of extended listening, while working.
I perceived slightly more gain than the RCA 6DN7 I've been using. Kept the volume set while testing. More air/sparkle and perhaps more touch and presence in the mids. This may just be new vs old tubes? Or, maybe there's a subtle upper and mid forward shift combined with rolled off low freqs, with these 6SN7.
At times, I heard an unnatural edge (tizzy) on cymbals - not great. Over hours of listening, they generally sounded too lean and bright. This is something the amp excels at in its stock form, and in my system - natural sounding acoustic instruments. Could be this bright edge would subside with more time.
The low end is less extended and defined with the 6SN7. Pretty significant loss there.
Went back to the stock pair and it reminds me how much I like this amp.
All good. For me, this is the point - perspective.
I'll keep playing with the 6SN7 off and on - maybe more play time will help.
I am more interested in the coming cap upgrades.
I should add that the 6SN7 sounded good in general - not all bad.
Finally - the hum I'd battled with a minor mod recently was louder with these tubes.
mcandmar
New member
The most rewarding is when you hear X, then measure it and find the same result
The Sylvanias (provided they are the real Sylvania and not rebrands) are the best sounding for mid/low end. You sacrifice a little bit of high end response vs the others, but depending on your setup that may be just what you are looking for.
The Sylvanias (provided they are the real Sylvania and not rebrands) are the best sounding for mid/low end. You sacrifice a little bit of high end response vs the others, but depending on your setup that may be just what you are looking for.
