572B vs 845 vs 211 SE - diyAudio
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Old 13th March 2007, 03:09 AM   #1
Ryssen is offline Ryssen  Sweden
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Default 572B vs 845 vs 211 SE

If you where to use any of these tubes in SE to drive the treble and midrange.Wich one would you chose for cleanest sound?I plan to use
850v.
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Old 13th March 2007, 10:24 AM   #2
felixx is online now felixx  Romania
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Try GM70
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Old 13th March 2007, 11:54 AM   #3
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Fuling: check Röhrentechnik guess you'll find the GM70 there.
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Old 13th March 2007, 04:20 PM   #4
Ryssen is offline Ryssen  Sweden
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Guys your out of toppic..
I have a chassie with 6,3v for the tubes..
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Old 13th March 2007, 04:30 PM   #5
kevinkr is offline kevinkr  United States
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The 211, and 845 have 10 volt filaments. I think they lack a little in finesse for a mids/tweeter amplifier as compared to say a 45, 2A3, PX25, 1625 or similar unless you need a lot of power..

Transformers with really good HF extension are more easily and less expensively realized with primaries of 5K or less.

The 572B is an unfamiliar animal so I'll ignore it for now.

IMO None of the tubes on your list would be my first choice for a midrange or tweeter amp.

How much power do you really need?
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Old 13th March 2007, 04:30 PM   #6
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As the 845 and 211 have 10V filaments you have answered your own question. I would recommend the 572-30 or 572-10 as a viable tube, more linear.
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Old 13th March 2007, 05:33 PM   #7
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hi all,

I was newbie of this thread,

let me share some of my comment.

If te budget enough I will suggest to use emission Lab 520-V3 from Jac music. I use , diy & test for vintage & moderen tube already. FInally I choose 520-V3.

Take a look the data of 520-V3.

filament was 5V only.

Lower filament will lower noise, low plate resistance so the OPT will approx 2~2.3K will enough!!

power & test god sound.


1) High Power application
520B Typical Data
Note: Only possible with Autobias.

Plate Voltage 530V
Plate Dissipation 69Watt
Plate Current 130mA
Grid Voltage -124Volt
Plate Impedance (Rp) 470Ohms
Amplification Factor 4.0
Transconductance (Gm) 8,5mA/V
Power Output in Class A 23Watt
Load Impedance (Ra) 1000-2400Ohm
Grid resistor 47kOhm


pls take a look photos I design for my friend's KR KT-1610 SE amp.

thx

thomas



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Old 13th March 2007, 05:41 PM   #8
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Do you know how much this tube is in USD or EURO? Found no price.
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Old 13th March 2007, 05:48 PM   #9
Fuling is offline Fuling  Sweden
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Quote:
Fuling
Vart kommer jag in i bilden?

But anyway, I´m going to build something with GM70 someday, I have all the ironwares left from an 813 SE project that never happened.
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Old 13th March 2007, 06:28 PM   #10
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hi soundbrigade,

its in Euro.


hi Fuling,

Actually I did not suggest U try 813 SE. since 813 was a high voltage, low current beam tetrode. U like connect the tube & use in triode rating??? can U share with me.

Looks GM70 was close to 845. I am not sure.

Will U prepare a 845 SE tube amp.

can we share experience??


thx

thomas
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