[marc513]

I am looking to see what people are using in there 211 tube amps. I have a NAT  SE2SE2 amp it uses two 211 tubes and two 6N1 P tubes. I see so many Shuguagn and Psvane tubes at all kinds of. Prices some almost as pricey as NOS GE and RCA tubes so what are people using . I am using the Psvane premium grade 211 T MK 2 I picked the amp up used and it had Sino tubes . The Psvane sound much better I like them . So are people using Shuguang Psvane Full music or something else ? I could spend maybe 400 - 450 a pair but are the pricey one that much better do they last long? Thoughts ........               

Thanks lake513

[FullRangeMan]

My thoughts on this dramatic situation are that I fell depressed that builders loss its time just for money to made a big triode amp with these unobtanium north american tubes instead the ready avaliable Russian Military tubes as GM70 and GK71 which cost $20 USD each and lasts 3K hours with soft start.
http://www.gstube.com/catalog/?key=gm70&submit=Find

[marc513]

I know FRM the new version of my amp now uses the GM70 tube but never saw a used one and new way out of my price range. I have a friend that has a amp that uses the GM 70 tubes it sounds real nice . I don’t know if my amp could be rebuilt to use the GM70 tube for a price I could afford .

Lake 513

[FullRangeMan]

Unfortunately no, only the 845 amp with a new 20V heather.
The 211 and GM70 are incompatible due different gain.
The good news are the Pentode GK71 have great sound already with 800V, not need the 1200V from the GM70 to sound good.

[Unison845]

GM70 SE 15W amplifier.

At 800V on Plate the GM70 sounded quite good, and you dont have to run at 1200V ( I did make 2 GM70 amplifier running at 1200V great sound too.). The reason I build this 15W GM70 amp is because I want to try the rare  Tango Permalloy NY15-3.5S. I am not disappointed!

[Unison845]

Unfortunately no, only the 845 amp with a new 20V heather.
The 211 and GM70 are incompatible due different gain.
The good news are the Pentode GK71 have great sound already with 800V, not need the 1200V from the GM70 to sound good.

I did compare GM70 VS GK71 in two identical monoblock amp, one used GM70, the other used GK71. I end up chosing to complete the amp with GM70. The reason is that GM70 copper plate do sound better (much clearer and detail in the mid, guitar, violin sounded much much natural than GK71. GM70 tube become pricey now, it cost anywhere from 6-8 times the GM70 graphite version.

[FullRangeMan]

I did compare GM70 VS GK71 in two identical monoblock amp, one used GM70, the other used GK71. I end up chosing to complete the amp with GM70. The reason is that GM70 copper plate do sound better (much clearer and detail in the mid, guitar, violin sounded much much natural than GK71. GM70 tube become pricey now, it cost anywhere from 6-8 times the GM70 graphite version.

Thanks for inform. The GM70 copper plate and metal plate were made for a short period only after the WW2 due graphite shortage.

[E55l2]

Thanks for inform. The GM70 copper plate and metal plate were made for a short period only after the WW2 due graphite shortage.

great to see those lovely tubes. I still have gm70 at home but till now i didn't used them. My Sv572-10 is still going strong.

[rollo]

I am looking to see what people are using in there 211 tube amps. I have a NAT  SE2SE2 amp it uses two 211 tubes and two 6N1 P tubes. I see so many Shuguagn and Psvane tubes at all kinds of. Prices some almost as pricey as NOS GE and RCA tubes so what are people using . I am using the Psvane premium grade 211 T MK 2 I picked the amp up used and it had Sino tubes . The Psvane sound much better I like them . So are people using Shuguang Psvane Full music or something else ? I could spend maybe 400 - 450 a pair but are the pricey one that much better do they last long? Thoughts ........               

Thanks lake513

    I am using the 211 T mk2 tubes. Very nice. Input tube NOS Mullard 6DJ8 and NOS Tungsol 5687 in each mono block Amp. Started as a Consonance Cyber 211. Now with Tango trannies, Audio Note resistors and Duelund CAST caps.


charles

[E55l2]

    I am using the 211 T mk2 tubes. Very nice. Input tube NOS Mullard 6DJ8 and NOS Tungsol 5687 in each mono block Amp. Started as a Consonance Cyber 211. Now with Tango trannies, Audio Note resistors and Duelund CAST caps.


charles

i can say the original Siemens MKV capaciters are stunning too. Siemens sold these to Epcos but they are still available.
It's a industrial capaciter with paperbase and oil with stunning technique and capabilities.

Look for serie B25834  ( still a standard range, they have specials too)
They are better then many "high end" capaciters and much more affordable too

[rollo]

i can say the original Siemens MKV capaciters are stunning too. Siemens sold these to Epcos but they are still available.
It's a industrial capaciter with paperbase and oil with stunning technique and capabilities.

Look for serie B25834  ( still a standard range, they have specials too)
They are better then many "high end" capaciters and much more affordable too

   Thank you for the information. Oils are nice to try.


charles

[E55l2]

   Thank you for the information. Oils are nice to try.


charles

yes they are excellent ( mineral oil and not biodegrade oil) and not as the Jensen and Audionote that could be leaky that could destroy your amplifier

[Unison845]

great to see those lovely tubes. I still have gm70 at home but till now i didn't used them. My Sv572-10 is still going strong.

The SV572-10 is nice and sounded like 845 little brother, I have both -3 and -10 version. The GM70 is different class, it is true 120W tube, the SV572-10/-3 I believe should be rated for 70W at max, running at rated 125W, they wont last more than a week. I read somewhere that somebody recommend running at red hot plate... dont take it seriously...

[E55l2]

The SV572-10 is nice and sounded like 845 little brother, I have both -3 and -10 version. The GM70 is different class, it is true 120W tube, the SV572-10/-3 I believe should be rated for 70W at max, running at rated 125W, they wont last more than a week. I read somewhere that somebody recommend running at red hot plate... dont take it seriously...

The reason to run the sv572 with red hot plate is because it has a special getter which will Work better if running hot.
Also the glas bulb can handle a lot more heat then a normal glas bulb.
My experients with Svetlana is that they know what they are doing but some designers who use tubes forget the designer rules for tubes as the sv572
it looks as a small tube but it runs very hot and they need space because they radiate more heat then normal tubes

[FullRangeMan]

The 572 have a low plate V option only 500V class A2.
All the 572 versions 3,10,30,160 are suited to audio?

[E55l2]

The 572 have a low plate V option only 500V class A2.
All the 572 versions 3,10,30,160 are suited to audio?

All can be used for audio but the design defined the quality of your amp. The best choice in my opinion would be the sv572-10. Even more linear than a 300b.

[FullRangeMan]

I asked why 30x and 160x are a lot of gain what makes sense in a ham radio.

[E55l2]

I asked why 30x and 160x are a lot of gain what makes sense in a ham radio.

Ease of drive, feedback, whatever people like to do. But yes, for ham Radio it is more suited but there is also 572b with topcap

[FullRangeMan]

What is the Pri Z for an 572-10 SE amp ?

[E55l2]

What is the Pri Z for an 572-10 SE amp ?

The Ri is 2100 Ohm en de linearity of the tube is awesome so there are a lot different loadlines possible.
If you want the best linearity the choice would be 10k or even more (More difficult to make). If you want more power than 5k-6k would be nice. Also think about the output impedance, what do you need?