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Old 10-11-2012, 10:00 PM   #21
ihartfood
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TS needs a boost doesn't he?
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Old 10-11-2012, 10:02 PM   #22
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Quote:
Originally Posted by Dave_Mc
oh yeah, of course- but it's still presumably going to be within certain limits. I mean... they always say a 12ax7 has a gain of, say, 100, and a 5751 has a gain of about 70. I'm guessing that means the 12ax7 maybe has a range of between maybe 90 and 110. but if you really want to lower the gain, you'd get a different tube, and presumably the reverse is true for increasing the gain... there are better, more efficient ways to do it which might actually work.


No, I agree with you, just pointing out the whole idea probably isn't totally snake oil. Like I said though, not really gonna be what the TS wants in this case.
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Old 10-11-2012, 10:22 PM   #23
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Maybe someone can help me out here. If a 12AX7 is 100% I thought it was like this:

12AX7 = 100%
5751 = 90%
12AT7 = 70%
12AY7 = 50%


Can someone confirm or fix that for me?
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Old 10-11-2012, 10:26 PM   #24
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Its not right. The problem with the 5751 is, from what I've heard, the NOS JAN tubes (the one most people are gonna have) were close to the same gain as a 12AX7, even though the 5751 isn't supposed to be.

From what I've read though its;

12AX7 100
5751 70
12AT7 60
12AY7 50

Like I said though, I think those 5751s were hotter than their rating, because every amp I've put them in I never felt like I had less gain, or not 30% less.
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Old 10-11-2012, 10:35 PM   #25
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when they say high gain tube they mean one that is tested to have around 90+

that isn't to say that a normal tube you buy can't have 90+ gain if it's not listed as high gain...it just means it was never screened...

unless the retailer has a strict policy to screen all of their tubes.

a good 5751 can easily have more gain then an average new production 12ax7.

you'be looking at somewhere between the 60-85 range for both.
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Old 10-12-2012, 10:32 AM   #26
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They make those 'pedal' things now, I believe. I've heard they're pretty good.
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Old 10-12-2012, 10:41 AM   #27
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Close, it's:

12AX7 100
5751 70
12AT7 60
12AY7 45
12AU7 19

However it is not uncommon for a modern 12AX7 to be down around 80 or 90 so a NOS 5751 seems closer than it should on paper.
In reality, 10% difference is sweet **** all really and can pretty much be considered 0%.
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Old 10-12-2012, 12:30 PM   #28
311ZOSOVHJH
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Quote:
Originally Posted by Cathbard
Close, it's:

12AX7 100
5751 70
12AT7 60
12AY7 45
12AU7 19

However it is not uncommon for a modern 12AX7 to be down around 80 or 90 so a NOS 5751 seems closer than it should on paper.
In reality, 10% difference is sweet **** all really and can pretty much be considered 0%.

Maybe that is what I was thinking
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Old 10-12-2012, 03:04 PM   #29
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Quote:
Originally Posted by Kevin Saale
No, I agree with you, just pointing out the whole idea probably isn't totally snake oil. Like I said though, not really gonna be what the TS wants in this case.


yep

Quote:
Originally Posted by AcousticMirror
when they say high gain tube they mean one that is tested to have around 90+

that isn't to say that a normal tube you buy can't have 90+ gain if it's not listed as high gain...it just means it was never screened...

unless the retailer has a strict policy to screen all of their tubes.

a good 5751 can easily have more gain then an average new production 12ax7.

you'be looking at somewhere between the 60-85 range for both.


that too. I've heard the NOS 5751s are more or less 12ax7s in terms of gain, but i haven't tried them. I (briefly) tried a sovtek 5751 in my vht special 6- it had a bit less gain. I didn't really like it, though, so i took it out (not because of the gain, i just thought it sounded a bit bland).
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Old 10-12-2012, 11:39 PM   #30
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Actually....on a slightly serious note, there is a drop-in preamp tube replacement that gives you a lot more gain than the normal 12AX7:



Yeah....solid state valves, eh?
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Old 10-13-2012, 12:21 AM   #31
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Quote:
Originally Posted by 311ZOSOVHJH
Maybe that is what I was thinking

If you were to compare the Phillips 5751 to a Phillips 12AX7 from the same era the difference would be far more evident. Good luck finding a Phillips genuine NOS 12AX7 for under $100 though.



kyle62, you do realise that I must kill you now don't you?
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