2006年10月24日 · 6SL7 is an octal 5751. They do sound different. 6SL7 has lower mu (70), but also a lower Rp. It is inherently quieter and less microphonic than many 12AX7's... other than the 7025 variants. Overlay the curves and you'll see what I mean. Yes, I have tried the 6SL7 in an 18W, but in an 18W bass with EL86 outputs. In a nutshell, spectacular! Cheers!

2007年6月20日 · Eli Duttman has said that the 6SL7 is very close to 12AX7 except for the mu. Also, people has used a 5751 in placed of a 1AX7 and this website (http://www.audiophool.cjb.net/Equiv_similar.htm) says 5751 is an equivalent to 6SL7.

2012年11月14日 · Among the 3, there's no exact match the way there is with 6SF5 or 6SQ7 and 12AX7. The 6SL7 has the same mu as 5751, at 70. The 6SL7 has a little lower plate resistance and a bit higher Gm; this means you'll get slightly more gain with the 6SL7 than the 5751, when using the same cathode and plate resistors. The 12AT7 seems close, at a mu of 60.

2007年3月24日 · 6SL7 is typically run at 2mA plate current or less. It makes a great voltage amplification stage but is generally not suitable as a driver, particularly if the output stage is a beam tetrode or triode, because such output stages have a relatively low input impedance which makes them difficult to drive.

2018年11月4日 · 6AT6/EBC90 is half a 5751, plus some diodes. 6Q7 is the same valve on octal base. Almost every 'modern' valve base has a version of this valve with near enough identical characteristics. In fact, I would guess that it may be the valve …

2012年3月11日 · I am also considering trying out the Sophia Electrics KT88, 6SL7 combo, but I am skeptical based on their "like NOS" pricing. I have found that when I get a new toy I massively suffer from fear of missing out (FOMO) and therefore must try all the recommended tube combos to find the best one....this is why I can't have nice things haha.

2011年10月11日 · I'd like to find something that is an octal equivalent to a 5751 (like how the 6SL7 is a 12AX7) without having to drop in an 8 to 9 pin adapter. Are there any tubes I can try that match what I'm talking about?

2011年1月17日 · Try a pair (4 triodes) in PP for a 10-15W amp -- it makes a great clean tone. Half of one of these makes a good concertina. The 6SL7 is a bit of a different tube. Let's call it a first cousin to the 12AX7 and 5751. Gain is more like the 5751, but plate resistance is lower.

2014年6月28日 · My 12ax7 preamp has 5751's in it. 12au7's were a bit too low gain, but the 5751's sound great. I also tested them in my Champ and they made it have a tone more reminiscent of the classic bigger Fender amps.

2014年1月14日 · Yep, the 5751 and .6SL7 have similar amplification factors. Some of the other parameters may be slightly different, but not by a lot.

2008年4月22日 · Commonly available octal dual triodes are 6SN7 (very much like a 12AU7) and 6SL7 (like a 5751 and probably closest octal sub for a 6SC7). One big difference between 6SN7 and 6SL7 vs 6SC7 is that the 6SC7 has a common cathode for …

2018年8月9日 · I liked the Tung-Sol 6SU7GTY with black glass and Black Plates. I was looking on the bay and found an adapter that allows the use of a 12AX7 series tube. The options are endless... For exact same gain as the 6SL7 you could use the adapter with a 5751 tube. Sometimes the best octal dual triode, isn't an octal dual triode.

2014年3月3日 · 5751 is the 9 pin equivalent. That is a low gain (70) version of the 12ax7 (100). you may find the 6SL7 to be more cost effective. Aside from using the same pinout, the 6sn7 isn't a sub for a 6sl7. The 6sn7 has a mu of 20 and the 6sl7 has a mu of 70. They have different plate resistance and max voltage as well as different heater currents.

2015年4月21日 · The differences between the two tubes (apart from the mu of 100 vs 70) is higher grid current and device capacitances in the in the 6SL7. The "tricks" I applied to convert a 12AX7 circuit (the LPSP) to use 6SL7 were basically just to lower Rg1 values to accommodate the extra grid current, I tried to keep the Rg1 values to not more than 3 X the ...

These are all pin compatible with one another, the only differences being the gain factor of each tube. A common substitution is to replace a 12AX7 with a 5751 or a 12AY7 to tame a preamp that tends to overdrive too easily, allowing you to get a better ‘clean’ sound out of your amp.

6 天之前 · The 6SL7 is a high gain low current amplifier and the 6SN7 is a rather low gain higher current tube. The 6SL7 can only handle 2.5 ma per triode and actually works best in the 0.5 to …

Guitar amp builders (historically including Gibson and Ampeg) also know that the 6SL7 has "Octal tone" compared with the electrically similar 5751 miniature. The 6SL7 is a great small-signal valve, useful in situations where the designer does not wish to miss a single electron on the grid.

2018年8月20日 · In terms of gain (mu) the octal 6SL7 is actually more similar to the 9 pin 5751, they both have a mu of 70 while the 12AX7 is 100. The 6SN7 has a mu of 20. There are a few 9 pin miniatures with the same gain: 12AU7, 12BH7, 6CG7. Some of the other parameters are likely different to some degree so check the data sheets.

2004年12月4日 · While the amp sounds good right now, I keep seeing comments from people saying that 6sl7 are one valve where NOS is a worthwhile improvement. Is it one of those crazy subtle differences that you really have to focus on to notice, or are there more pronounced differences going on?

No, 6SL7 and 6SN7 are not interchangeable as both have different characteristics. 6SL7 tubes have lower transconductance and higher amplification than 6SN7. The amplification factor of 6SN7 is 20, and a plate resistance is approximately 77K, whereas for 6SL7, the amplification factor is 70, and a plate resistance is 44K.