Anyone using Airtight ATM 211 to recommend?

[mtemur]

Dear @BP4007 @Dante Choi @bonzo75 and @ogschile I hope you are biasing your amplifier every time you change 211 tubes cause output tubes need proper biasing. especially when you are tube rolling.
Additionally every tube (even the used old stock ones) requires at least 20 hours of burn in after a long unused period. I believe IOT accurately evaluate an output tube's sound, biasing and burn in period should not be skipped.

I hope your prior comments about sonic differences of various 211 tubes are based on regarding these considerations.

 

[BP4007]

Yes, I always bias my amps. It is quite easy on the ATM 211. I generally consider proper burn in time for 211 tubes at about 100 hrs.

 

[cuntigh]

Tube amps need to be biased regularly, not only when you change the tubes. Auto biased tube amps are ideal for that matter. With Air Tight it is very easy to do. If you biase high or low you can modulate the sound quality. With ATM3 and ATM1S we are several users who found the sound better when power tubes are biased lower than recommended by the manufacturer.

 

[mtemur]

Tube amps need to be biased regularly, not only when you change the tubes.

thank you, output tubes also need to be biased when the line voltage changes. biasing in general is very important and needs to be done regularly as you mentioned but my prior comment based on tube rolling.

 

[new2Krell]

Tube amps need to be biased regularly, not only when you change the tubes. Auto biased tube amps are ideal for that matter. With Air Tight it is very easy to do. If you biase high or low you can modulate the sound quality. With ATM3 and ATM1S we are several users who found the sound better when power tubes are biased lower than recommended by the manufacturer.

I guess it all depends on where the manufacturer specified the bias level. I don't know anything about ATMs.
I have EL34's in my amps, the "usable" range is 50 - 70%. The manufacturer specifies 26-29 ma (52 - 58%), already at the lower end of the range. I have just settled on a bias level of 53% for my recently installed tubes. I find I get the best sound from my amps when biased "cool".

 

[Dante Choi]

Finally sold my ATM-211, have changed by Audio Note UK Ongaku Shinguru. If some one love 211, please consider ANUK…

I love Amperex 211D, but not possible to use with my Ongaku’ auto bias. I’m using with original WE-242C, incredible sound.

 

[Norway]

I have the possibility to get a pair ATM-211(at a very good price) but not sure that they will be quiet enough on my Altec VOTT s.

 

[Republicoftexas69]

I have the possibility to get a pair ATM-211(at a very good price) but not sure that they will be quiet enough on my Altec VOTT s.

Not sure either but they are fine looking specimens.

 

[BP4007]

Mine are extremely quiet. Using with Horning (99db) and Zingali (98db) speakers. Your Altec's are a bit more sensitive, but I have not had an issue with background noise. Dead quiet. Using Air tight ATE 2001 pre.

 

[Norway]

Mine are extremely quiet. Using with Horning (99db) and Zingali (98db) speakers. Your Altec's are a bit more sensitive, but I have not had an issue with background noise. Dead quiet. Using Air tight ATE 2001 pre.

Thanks for your reply. My VOTTs are a bit more than a bit more sensitive.

 

[Dante Choi]

I have the possibility to get a pair ATM-211(at a very good price) but not sure that they will be quiet enough on my Altec VOTT s.

I have used to drive Vitavox CN-191, maybe 105db… was very good matching. Please try to found Amperex brass base with molibdeno plate 211 or Amperex 211D also brass base.

 

[Legolas]

I have the possibility to get a pair ATM-211(at a very good price) but not sure that they will be quiet enough on my Altec VOTT s.

Interesting.I do like the 211 tubes, and wildly available as well. One thing I notice about these monoblocks, they both have an attenuator. Is that for balancing the input level while using a preamp?

 

[Dante Choi]

Interesting.I do like the 211 tubes, and wildly available as well. One thing I notice about these monoblocks, they both have an attenuator. Is that for balancing the input level while using a preamp?

You can use these attenuators as Pre amp volume perfectly.

 

[Legolas]

You can use these attenuators as Pre amp volume perfectly.

Yes but it is a bit impractical to adjust between amps every time. You probably need a preamp

 

[Maril555]

Interesting.I do like the 211 tubes, and wildly available as well. One thing I notice about these monoblocks, they both have an attenuator. Is that for balancing the input level while using a preamp?

Its mostly for adjusting the overall gain structure of the system. For instance, if you have a high gain preamp and sensitive speakers, then you’ll have an opportunity to lower the power amp’s input sensitivity, etc.
Many older amps had that feature, all Shindo amps do to.

 

[Dante Choi]

Yes but it is a bit impractical to adjust between amps every time. You probably need a preamp

Off course!! The function of a good Pre amp is not only to adjust volume, I have use ATM-211 with ANUK M6 Phono and M9 Phono.

 

[Norway]

So here is my new set up with the 211 and Lyngdorf 3400

 

[adamaley]

Any update on how you are liking the ATM-211s?

 

[Dante Choi]

So here is my new set up with the 211 and Lyngdorf 3400View attachment 114206View attachment 114207View attachment 114208View attachment 114209

Try Amperex 211 Brass base or Amperex 211D. With These power amps, will be heaven.

 

[BP4007]

Agree on the Amperex 211 tubes. I have tried many NOS tubes and found the Amperex to be the best. If buying new, consider the Elrog 242 (if you can find them), or the new Psvane 242's. I'm running the Amperex in my Air Tight 211 mono's, with the Air Tight ATE 2001 for a pre amp, Horning Eufrodite, or Zingali speakers. Love the set up.