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I like 6DJ8 family they are cheap in Russia and are plenty of subs:6N1P 6N2P 6922 6H30 6DJ8 7DJ8 7308 PCC88 ECC88 E88CC E288CC 6N1 6H23P-EB, Siemens 8223 GA7 CV5358 5670
FRM,That's inaccurate. There are plenty in that list that have nothing to do with the 6DJ8 family. The 6N2P is a 12AX7 substitute. The 6N1P is a completely different design as is the 6H30, 5670, etc...They might be 9 pin tubes but they are not interchangeable with respect to design criteria and particularly heater current as well. Best,Anand.
Phew! Thank you, Anand! Misinfomation like this could result in equipment failure. Be very careful about tube substitutions. I'm sorry to say I wouldn't take the word of a tube seller as gospel because they want to sell tubes!Here is a tube data sheet web source that is much more accurate on substitutions.
Nice you came in rescue of your compatriot friend and his 6/12V mischap but this http://tdsl.duncanamps.com/ face page link you posted show no evidence.
This are some partial subs info I get now:http://www.mif.pg.gda.pl/cgi-bin/vs4.plhttp://www.mif.pg.gda.pl/cgi-bin/vs4.plhttps://www.radiomuseum.org/tubes/tube_6dj8.htmlhttps://www.radiomuseum.org/tubes/tube_6922.htmlhttp://www.gstube.com/catalog/?key=6922&submit=Findhttp://www.gstube.com/catalog/?key=6dj8&submit=Find
Not much info out there on this line stage, so I struggled to understand the layout and what each tube does in the circuit.Tubes are lined up 6 across: 1 2 3 4 5 65687 12au7 12au7 12au7 12au7 5687(tubes 2 thru 5 are 12at7 in earlier version of the YS Audio / Audio Experience Balanced A2 preamp)My understanding is that they work in L and R pairs, so 3 pairs. So the 2 middle ones (tubes 3 and 4) are a L R pair and do the same thing in the circuit and therefore must be a matched pair. Moving to the outside in each direction, tubes 2 and 5 are a L R pair working together in the circuit and must also be a matched pair, but not necessarily identical to the prior pair. From this review I learned that the 2 pair of 12au7 do the gain, and the 5687 is the output buffer.http://www.enjoythemusic.com/magazine/equipment/0910/ys_audio_audio_experience_a2_se.htmBut this always confused me......If you check the specs on the mfr website you will see that the XLR outputs give 20 db of gain for both SE and XLR inputs, while the SE outputs give only 4 or 14 db of gain (varies depending on whether SE or XLR inputs are used). And this is at odds with the review referenced above which says gain is 17db at XLR outputs and 12db at SE outputs. Anyone have any insight?I used 2 different pair of 12at7 simply because I didn't have 4 of the same, and I figured (guessed?) it was safe to do so. My guess is that you can safely use different tube pair combos to shape the sound and achieve different sonic landscapes and synergies.
I recently purchased a pair of 300b PSET monoblocks and got the urge to do a little tube rolling in my A2. I bought a quad of Mullard m8162 for the 12AAT7 and a pair of Sylvania 7119 for the 5687. Also looking at another pair of 5687. I’ll probably end up selling what I don’t keep. Martin
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