Balanced Lampi Dac - Joe you are famous now

Yes, I would say 15 inches, given that the Elrogs and the EML anniversary globes are even bigger than the 45.

Indeed, i would have the Lampi on top of any rack, no matter if its one layer or several.

Shawn, i agree if you have small kids with wandering amps, stay away from Mercury vapour tubes. Still, i only plan to use them in an actuve session, not to leave them in there permanently...I also handle them with kids gloves.
 
Mike said:
Joe, I recommend a matched quad of National Union (made by RCA) FT Shape 45's.

$_35.JPG
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Brent have these?
 
I am in Brooklyn. Charlotte is where my computer routes through (my law firm has a huge office there).

My tube guy has a lot of the 5R4GYs. Is there a preferred brand?
 
sfox7076 said:
I am in Brooklyn. Charlotte is where my computer routes through (my law firm has a huge office there).

My tube guy has a lot of the 5R4GYs. Is there a preferred brand?
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GE/RCA JAN specs.
 
Alpinist said:
Joe,

If I go for a Big 7 next year, it will probably be the SE version because it turns out my Soulution 520 Preamp is unbalanced through its XLR inputs. Cyrill Hammer said they could detect no audible difference between balanced and unbalanced, so they went for the less complicated unbalanced design. Based on the amount of jazz vocals I listen to, the Dueland copper or Jensen copper caps would probably work best for me, to provide a beautiful midrange. Elrog 300B or EML 45 Mesh output tubes for the same reason.

Ken
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There you go Ken!!
 
Congrats Joe! It sure is cool looking. I much prefer the aluminum to the original B7 box (although the GG copper is my fav). I am really curious to get your thought s on PCM. Lucasz's DSD is quite singular in its exceptionalism (both sound and approach); nothing I have heard quite compares in the digital domain. But I still haven't decided if PCM would be in the cards for me via Lampi when I do digital. Enjoy!
 
Joe, hold your horses. Dont buy any new output DHT tubes yet. Stick with what you have and only roll the RECTIFIER tube.

45 triodes WONT work…that was old info. Just called Poland and that was confirmed to me. Tomorrow he will test to see what else can work with the current design.
So message is ONLY 101d possible, at least for the moment!!!!
 
OK guys:

First off, apologies for misleading you with old info and bad understanding. I, like everyone else initially read that it was 101d and 45 and NO 300B, etc. I used my SE Dac tube understanding to wrongly extrapolate.

Balanced comes with different challenges, with heat emission/dissipation being a big new one. I can say with my current understanding of the tech mumbo-jumbo, that definitely 45 triode and 2a3 will definitely NOT work in the current design (just too hot)! It IS possible that 300b and 6a3 will work in Joe's Dac, but with certain caveats. 6A3 has a near perfect voltage/amp profile for the circuit power supply, but the tube underheated in the current setup and "should" not sound good according to Lukasz. HOWEVER, he said the same for SE and advised people to switch to 2a3 setting (high), BUT most, if not all said they preferred 6A3 run on the 45 setting (low) where it certainly would be under heated. The tradeoff is that with constant under heating, tube life theoretically suffers in an amp, but as this is run at preamp levels, it may not be a big deal…especially as 6A3 is relatively cheap and plentiful.

300b should be heated close to optimally and theoretically run a bit cooler than the approved 101d in balanced config. He will test in the next few days to ensure its a safe swap out and will let me know by text and I will keep you all up to date on what I hear.

The whole issue is about voltage drop from power supply and consequent wasted wattage dissipated as heat.

I guess in the future he can work on a different enclosure design or some other innovation to get more rolling flexibility, but I would not held my breath on that one (redesign/new supplier sourcing and qualification/prototying, etc will take time and that is IF he thinks it makes sense to go in that direction). Besides, 101d comes as Treasure series and WE replica new production, so recti roll plus metal base replicas is already great flexibility. 300b seems on paper safe to me subject to Lukasz verification, but I cant guarantee how they will sound in the Bal circuit today. i expect they will sound good though, as the "setting" point seems to be between the old high and low setting, and the voltage drop to 300b is slightly better than for the 101d.

For general info on electrical parameters, see below:
101d= 4.5x1.5 (volts times amps)
45 = 2.5x1.5
300b = 5.0x1.2
6A3 = 6.3x 1.0

I hope this post has enuff clarity for everyone concerned???
 
Yup, I let him know that guys like you and Andy LOVE your Elrogs and want 300b as a DEFINITE option. when he was explaining the techie stuff, I recalled that 300b was not THAT different to 101 in terms of volts and so even he agreed that it may not be an issue, but typical engineer, he needs to test and verify in the real world. Likely tomorrow, as 300b guys are always insistent…especially in the Far East. LoL Elrog 300b is a high roller tube, as a quad will be 25hundred bucks…!!
 
wisnon said:
Joe, hold your horses. Dont buy any new output DHT tubes yet. Stick with what you have and only roll the RECTIFIER tube.

45 triodes WON'T work…that was old info. Just called Poland and that was confirmed to me. Tomorrow he will test to see what else can work with the current design.
So message is ONLY 101d possible, at least for the moment!!!!
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Thanks Norman, we'll talk over the weekend.
 
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