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Crack;Bottlehead OTL - Page 245

post #3661 of 6004
Quote:
Originally Posted by FlySweep View Post
 

 

One of my favorite E80CC's is the Amperex PQ 6085.. lovely sound that tube has.. plenty of speed, detail, and dynamics.  Only thing with 12BH7s is, IME, they tend to sound slightly forward through the mids.. not really a drawback, just an observation.

 

You're also forgetting the fact that they are taller but bit slimmer than the 12AU7's, we all love tall tubes right? :p

post #3662 of 6004
Quote:
Originally Posted by FlySweep View Post
 

 

One of my favorite E80CC's is the Amperex PQ 6085.. lovely sound that tube has.. plenty of speed, detail, and dynamics.  Only thing with 12BH7s is, IME, they tend to sound slightly forward through the mids.. not really a drawback, just an observation.

 

 

Interesting I have that tube.. and commented on it a while back (in this thread or another thread somewhere, I think)... and I'm listening with the it right now.  Yeah, it was bright.. for a long time.. I'm talking months (and I used it pretty regularly from when it arrived to when I heard it noticeably change).  Believe it or not, that tube will eventually balance out.. and sound very very good.  It will have really nice bass.  Not the throbbing, subwoofer type.. but a hefty, full, punchy bass response that's natural.  The mids will sound wonderfully detailed and tonally neutral.. but not clinical or thin.  They'll have a hint of that delicious liquidity that its younger 12AU7 brethren has (but the E80CC isn't quite as rich and liquid).  The treble will smooth out too, btw.  Again, it won't ever sound as warm and laid back as it's 12AU7 sibling, but the E80CC is more resolving and better extended.  It'll have a slightly brighter overall tone, but it won't sound as thin, lean or harsh as it might sound now.  Give it more time (a lot more time) if you're up for it.  Also, its one one the best built tubes I've seen... that sucker is rugged!

Nice description and along the same lines as my impressions of Siemens E80CC that I am using.

post #3663 of 6004
I don't think I'm up for waiting months to burn this sucker in, even though it has the Bst moods I've heard so far. There must be a way to burn in tubes other then in my Crack.
post #3664 of 6004
Quote:
Originally Posted by mordicai View Post

I don't think I'm up for waiting months to burn this sucker in, even though it has the Bst moods I've heard so far. There must be a way to burn in tubes other then in my Crack.

 

Just leave it running when you're not around (but use a cheap 6080 if you don't want to waste the life of a good one)

post #3665 of 6004

Its been running about 15 hrs a day for about a month = thats about 450 hrs .I don't believe in this tube now that I have installed Speedball in the Crack. I loved it before that.

post #3666 of 6004

No tube requires 450 + hrs of burn in. If it's humming or emitting background hiss/noise its a bad/shorted tube. I also wouldn't recommend burning the amp using any 6080 which put out more heat than regular 6AS7G's. Use a 6AS7G if you need it for this task.

post #3667 of 6004
Quote:
Originally Posted by DefQon View PostI also wouldn't recommend burning the amp using any 6080 which put out more heat than regular 6AS7G's. Use a 6AS7G if you need it for this task.

Huh?

post #3668 of 6004

6080's put out more heat than 6AS7G's look it up. And another thing I've run into and I think it may apply to the Crack as well is if I use a 6080 in amp X, plate and heater voltage increases as well, put back the 6AS7G and it's back to normal. Odd

 

http://www.r-type.org/exhib/aaa0725.htm


Edited by DefQon - 1/29/14 at 5:24pm
post #3669 of 6004

Huh, Yah me too. This tube has never had any noise of hiss. Amp came with a 6080. What heat are you talking about? Anyway all this E80CC got me ready to go again, so I got the Tungstram out of its box for the 20th time and let it warm up a bit. YOU  WON'T BELIVE THIS......all these weeks that tube had been in its box it has Burned In.....magic! Sure sounds great to me now. Treble seems to have smoothed out, and the bass has improved...What can I tell you.....what a crazy hobby.

post #3670 of 6004
Quote:
Originally Posted by mordicai View Post
 

Huh, Yah me too. This tube has never had any noise of hiss. Amp came with a 6080. What heat are you talking about? Anyway all this E80CC got me ready to go again, so I got the Tungstram out of its box for the 20th time and let it warm up a bit. YOU  WON'T BELIVE THIS......all these weeks that tube had been in its box it has Burned In.....magic! Sure sounds great to me now. Treble seems to have smoothed out, and the bass has improved...What can I tell you.....what a crazy hobby.

 

Yeah my first Crack kit came with a Raytheon 6080 too but the next 4 kits that came to me came with 6AS7's. I'm talking about the tube heat, i.e surface of the tube it get's and run's hotter than the 6AS7G. I measured mine yesterday and 6AS7G's it's running about 75'C with an ambient temperature of 25-26'C. Rolled in the 6080 and boom 98'C, all voltages increased by 20%. Noticed this in every amp I've played with that takes 6AS7G and said sub/equivalents. Not sure what's the problem or it could be my mains is too high feeding more than acceptable into the trafo. 

post #3671 of 6004

DACport LX or HRT Music Streamer ii+ or Matrix M-Stage DAC for Crack? I found a 1 year used LX for about $ 175...

post #3672 of 6004
Quote:
Originally Posted by DefQon View Post
 

 

Yeah my first Crack kit came with a Raytheon 6080 too but the next 4 kits that came to me came with 6AS7's. I'm talking about the tube heat, i.e surface of the tube it get's and run's hotter than the 6AS7G. I measured mine yesterday and 6AS7G's it's running about 75'C with an ambient temperature of 25-26'C. Rolled in the 6080 and boom 98'C, all voltages increased by 20%. Noticed this in every amp I've played with that takes 6AS7G and said sub/equivalents. Not sure what's the problem or it could be my mains is too high feeding more than acceptable into the trafo. 

 

As far as I know, the Crack was designed to run 6080s so I don't think there is any safety issue with the tube getting hotter. Either way, the point was to use a cheap tube for burning-in if you're not listening at the same time so that you don't lose life from a favourite tube.

post #3673 of 6004
Quote:
Originally Posted by Loquah View Post
 

 

As far as I know, the Crack was designed to run 6080s so I don't think there is any safety issue with the tube getting hotter. Either way, the point was to use a cheap tube for burning-in if you're not listening at the same time so that you don't lose life from a favourite tube.

 

I know but as I said as I've had this issue so far it's best to run something cooler than the hot 6080's. I've always run 6AS7G for anything short of testing to troubleshooting, got a whole stash so why not IME.

post #3674 of 6004
Quote:
Originally Posted by DefQon View Post
 

 

I know but as I said as I've had this issue so far it's best to run something cooler than the hot 6080's. I've always run 6AS7G for anything short of testing to troubleshooting, got a whole stash so why not IME.

 

I'm not being difficult when I ask this:

 

Why are you concerned about a tube running slightly hotter when it's a well-known, very popular tube that's been in use for many years with no reports of problems and it's being used in a system that's designed specifically for it? I don't understand the concern.

post #3675 of 6004
Quote:
Originally Posted by DefQon View Post
 

6080's put out more heat than 6AS7G's look it up. And another thing I've run into and I think it may apply to the Crack as well is if I use a 6080 in amp X, plate and heater voltage increases as well, put back the 6AS7G and it's back to normal. Odd

 

http://www.r-type.org/exhib/aaa0725.htm

 

I'm going to disagree here.  Both draw the same filament current at the same voltage.  In the Crack circuit, both draw the same current from the high voltage supply. 

 

If the plate/heater voltages go up with a 6080, then the 6AS7 would in fact run hotter. 

 

In any case, they carry the same ratings and often have the same guts, just in different glass envelopes. 

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