Contact Andrew via the Sparkos website to see if he has a file & is willing to share for owners to print a cover. Another option is a tube riser. The 5670 to 6922 adapter I used raised the tube which provided more glow and was easier to remove due to the extra height.
I can't wait to get home tomorrow - been out of town and an Amperex 7308 has been waiting in my mailbox since Friday.
I'd want to improve aesthetics and ease of tube rolling (I kind of like the look of the Schiit Lyr+ and its recessed drain plug look)
The recessing could help make it easier to grip and swap tubes and the extra holes could help with cooling.
Also maybe some type of a quick access to the jumpers (or even a little switch panel wire to the jumpers) would make it easier to set the tube heater, input gain and bias points.
I'd want to improve aesthetics and ease of tube rolling (I kind of like the look of the Schiit Lyr+ and its recessed drain plug look)
The recessing could help make it easier to grip and swap tubes and the extra holes could help with cooling.
Also maybe some type of a quick access to the jumpers (or even a little switch panel wire to the jumpers) would make it easier to set the tube heater, input gain and bias points.
The Sparks family is at AXPONA this coming weekend so I suspect he will be busy right now. He always does respond to my email questions though. If you are in the Chicago area, he may have some free tickets. PM me if you want the link.
Wow! That is a pretty cool-looking 6SN7. Since I never tried one with an adapter, curious about your assessment of its sound. I have also seen others on the ampsandsound forum when using two 6J5 tubes and an adapter to 6SN7. The 6J5 is a single triode version of the dual triode 6SN7. There seem to be almost endless possibilities with the Gemini.
.... if you are adapting a 6SN7 to 6922 equivalency, why would you not use the 'Type 1' jumper setting? That is what a straight 6922 uses. The 'Type 2' jumper setting is for 12-volt tubes. You may burn out your GFT tube.
.... if you are adapting a 6SN7 to 6922 equivalency, why would you not use the 'Type 1' jumper setting? That is what a straight 6922 uses. The 'Type 2' jumper setting is for 12-volt tubes. You may burn out your GFT tube.
I'm not worried. Like I said, I cleared it with the boss first. Andrew says:
"...The 6SN7 will work with the adapter you have. I *think* it will be type two for the heater. If you get it wrong, it wont hurt anything, but either you will only get one channel (and only one of the two heaters) will light or neither of them will. The volume control will get scratchy when it's rotated if it's set wrong too. So I would say try type 2, and see if both heaters light. If they do, you have it right. If not, move the jumper..."
This is consistent with the manual too.
My initial impressions of the sound (take it with a grain of salt as I have not critically A/B) - is its very holographic. I feel the soundstage is bigger, instruments are more layered and more space between. Sounds phenomenal.
I might need to do some recordings of both my Cryotone 6922 vs the Treasure Globe 6SN7 to be sure. Too much gap time between swaps makes it harder to be certain if I'm just overhyped that it actually works.
***EDIT - based on Andrew's comments. When I listed with headphones and adjusted the pot, I heard a little bit of static. So as per Johnathan C's suggestion, I tried with jumper in Tube Type 1 mode. Result - no more static with pot. Sound is even cleaner now. Wow ****
*** UPDATE - 04-09-6:00PM - Ok hand a chance to listen to the cryotone 6922 and treasure globe 6sn7 a few times back to back. The 6SN7 does sound phenomenal but so does the 6922 - I could not tell any big differences between the two. Both I would consider high end tubes and I'd consider their sound quality at the same level at this stage. So at this point - I'd say, just be happy we have another huge family of tubes to explore in 6SN7, but it doesn't necessarily mean they are going to better than the best 6922s already out there. Your mileage may vary, but I tried listening on headphones at speakers and in my setup, nothing jumped out at me as being vastly different. Just cool I can swap between tubes that I have for my schit Lyr+ and sparkos gemini now.
Is there a list of supported tubes?
Edit: Found it...
12AX7, 12AU7, 12AT7, 12AY7, 12BH7, 6072A, 6AQ8, ECC83S, ECC81, ECC802S. Pretty much any dual triode tube with 9 pins
Is there a list of supported tubes?
Edit: Found it...
12AX7, 12AU7, 12AT7, 12AY7, 12BH7, 6072A, 6AQ8, ECC83S, ECC81, ECC802S. Pretty much any dual triode tube with 9 pins
Johnathan C - I think I saw you at one point had an LTA Velo. Any thoughts on it in comparison to Gemini?
I was having difficulty in my rig hearing the differences with some of my tubes. Forgot way back that I had my bias jumper high and I always listen with button out.
The clarity is greatest when using more of the SS2590 op amps than the tubes...but yes you lose out on the holographic soundstage depth and layering.
Gonna have to go back re-roll all my tubes with max tube settings so I can understand their character.
I have LTA MZ3. With Raytheon 12SN7 pair + MOV A2900 pair, MZ3 has the clarity of and greater holography than Gemini. Where Gemini betters MZ3 is in 'impact' of sound -- independent of volume level. Both MZ3 and Gemini are at their best with low-impedance headphones.
I was having difficulty in my rig hearing the differences with some of my tubes. Forgot way back that I had my bias jumper high and I always listen with button out.
The clarity is greatest when using more of the SS2590 op amps than the tubes...but yes you lose out on the holographic soundstage depth and layering.
I have LTA MZ3. With Raytheon 12SN7 pair + MOV A2900 pair, MZ3 has the clarity of and greater holography than Gemini. Where Gemini betters MZ3 is in 'impact' of sound -- independent of volume level. Both MZ3 and Gemini are at their best with low-impedance headphones.
With tubes such as Brimar CV4033, Telefunken ECC801S, Telefunken G-73R, Valvo E188CC, you can have the bias jumper 'low' with minimal loss of clarity.
Not directly related to the above, but it does matter: upgrade the fuse. [I use Audio Magic M-2 .... ]
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