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I played around with various old stock 6DJ8's, 7308's, etc. and now am going to spend a good day comparing them closely. My initial reactions are mych less sonic differences in them than the 12AU7's I compared in my ASL integrated amp. But much greater variation in microphonics and noise. Most of the tubes I played around with were at least slightly microphonic. Others were quite pronounced. I have a slew of tubes to try as I have accumulated a nice stash of them over the years. I also thought I might try a couple of 7DJ8's I have purchased but never used. Also some Russian equivalents. Love to hear anyone elses experiences with them.
f1jim
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Will the SA-3.1 accept 6FQ7/ 6CG7's? I've been using these in my SA-220 amplifiers for years. I get a fuller sound than with any 6922 or 6DJ8 type. Counterpoint approved substitute in this amp. Not sure about the 3.1 preamp though- mostly a matter a heater current available, I believe.
Cory
Via WayBack Machine:
Alternatives to the 6DJ8/6922 for Line Stages and Power Amps. For different sonic preferences I can suggest several other choices. I do not stock these other tubes, you'll need to hunt them down yourself.
7308/E188CC/8223/E288CC tubes are equivalent to 6DJ8/6922 types and can be used in place of them in all Counterpoint equipment. They are usually too noisy and/or microphonic for phono stages.
6CG7/6FQ7 tubes can also be used in place of the 6DJ8 in line stages and power amps. Usually presenting a softer, more rounded, classic triode sound with fat, deep bass. However, the RCA "clear top" is very well-balanced and nice to listen to. Again, these tubes are generally too noisy and/or microphonic for phono stages.
For a good review of the many 6DJ8-type tubes, see Joe's Tube Lore on Audio Asylum at http://www.audioasylum.com/audio/faq/joes-tubes.html#6DJ8
Cory
:)
"I know just enough to get into trouble. But not enough to get out of it."
Just to backup what Cory said, I used to drop 6CG7/6FQ7's into the line section of my SA3k every once in a while when I was in the mood for something different. The resulting sound was exactly as Mike Elliott described it in that text Cory lifted from the old Alta Vista site. A rounder/fuller, more what some might call a classic tube sound.
I should really try some other types in my amps again. I've been using RCA clear top 6FQ7's (which I love) for a long time, back to when they were used as full- range amps.
I'm running 3 SA-220's now- one for the midrange (which I'll likely keep the RCA's in), and one per channel on the bass panels. I'm curious if there might be a better tube suited for the bass side in particular. Is there one that excels in that department, in your opinion?
Curious about those Toshiba M- types that you were talking about.
Cory
I had an sa3 for a few years then got an sa5 which has remained in my system for more than 25 years. Mullard and Brimar 6dj8's have always been my favourites for nice midrange and low microphonics. Siemens add a nice sparkle. Can't go wrong with BB'S in which case I prefer the large O getter over the D. Note BB'S can sometimes be quite microphonic but I've only encountered that a few times. I have some Tele's, Valvo,Japanese and Russian which I haven't tried for a long long time. I had changed all the bypass caps along with a couple caps in the power supply a while back and never really stopped to try the latter tubes again. I really should take them all for a spin again like you're doing. Have fun "rolling"!
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Had an SA3000 for a really long time. Virtually every mod Mike Elliott ever offered for it was done to it by the time I sold it. Anyway, I listened to a boat load of different 6DJ8 types in it over 18 years, and my favorites ended up being Tele 6922's. The Teles are still my all around fav's. For me they're just the right balance of detail, top/bottom extension and tone. Others that spent longer than most in rotation include Siemens 7308's and the lowly Bugle Boy. There's something about the tone of the BB's that I'm very fond of even though they under-perform, IMO, in other areas.
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