211 VT-4C Good Simple SE Schematic - diyAudio
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Old 2nd June 2004, 06:48 AM   #1
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Default 211 VT-4C Good Simple SE Schematic

Hi,

does somebody have a good 211 / VT4C schematic like Air Tight ATM-211 to recommend ? If it's possible without interstage transformer and 6SN7 input valve.

I have some, but I would like to have opinion those which used these valve and to share their experiment

Thanks.

Pascal.
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Old 2nd June 2004, 12:56 PM   #2
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Default Simple 211

About the least complex 211 I've seen is the design on PAE's site:

PAE 6C45 --> 211 amplifier

I built a version (with a very different power supply design) with a more modest B+ (825vdc) that I've been enjoying.

Click the image to open in full size.

Use RF precautions around the 6C45 (grid stoppers, RF beads).

- Gary

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Old 4th June 2004, 05:52 PM   #3
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Thank you very much Gary.

Does somebody have schematic of Atarashi Parafeed 845 amplifier ? It is a 845 drive by a 6CA7 and i think it would be interesting with 845 and KT88.

Thanks

Pascal.
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Old 4th June 2004, 06:06 PM   #4
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I think this is the schematic you're looking for:

6CA7 --> 845

- Gary
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Old 20th January 2006, 02:06 PM   #5
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Has anyone built this amp? I'm quite curious about it... I like it's simplicity:

Quote:
About the least complex 211 I've seen is the design on PAE's site:
http://digilander.libero.it/paeng/6c...ation_page.htm


@ Gary / The-Planet : What is your version of the power supply??


Thanks
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Old 5th July 2011, 12:49 AM   #6
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Hello
Can someone let me know if I can replace the 211 tube with GM70 type?
I know I can replace 845 with GM70 if I adjust the heater voltage. GM70 use 20V for filament.
I have a nice 211 schematic "Goliath" but I want to use GM70 power tubes.
Greetings gabor
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Old 5th July 2011, 03:08 PM   #7
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211: ≈11
845: ≈5
GM70: ≈6

Is that the right schematic ?
http://www.triodedick.com/goliath/go...versterker.GIF

Than you can't use it. The 27/56 doesn't have the ability to drive the low- GM70.
Rough calc: Ub≈1000V -> GM70 has to control 2000V with a mu of 6 -> you have to deliver a Vpp of 2000/6 ≈ 333Vpp

Vpp from the driver in the schematic is too low.
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Old 5th July 2011, 03:54 PM   #8
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Hello

Thank you for youranswer.
Yes that is the schematic. I know these tube hard to drive..
Many people drive the GM70 with D3a tube. Get about 17-20W power.
Here not tha D3a tube is the drive of the GM70??
Thanks one more time.

Greetings gabor
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Old 5th July 2011, 04:31 PM   #9
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Hi!

The D3A is a poor choice as a driver IMHO, way too little headroom. While the possibility to get away with 2 stages might be tempting, over simplyfing things can be a bad compromise. Yet it can be done with 2 stages

Here is my approach to a 2-stage 211 amp, not very simple, but good

VinylSavor: Making of a 211 Amplifier, Part 1: Planning

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Old 5th July 2011, 05:58 PM   #10
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Hi
Thank you very much.
I see U use inter stage transformer. I would like to avoid to use one.
There are many design with 2 stage with out inter stage transformer. Some people say the D3a would be the best choice.

Many of these tubes have a plate resistance
about 2Kohm but only the D3A and 6C45
have an amplification factor greater than 50

D3A specifications in triode connection
:

filament voltage: 6.3V
filament current: 315mA

Max plate voltage: 200v
Max plate dissipation: 4.2w
Max cathode current: 33mA
Plate resistance: 1.9Kohm
Amplification factor: : 77
Max resistance in grid circuit: 0.5Mohm

6C45 specifications:
filament voltage: 6.3V
filament current: 440mA

Max plate voltage: 150v <<<<< it is lower than D3a
Max plate dissipation: 7.8w
Max cathode current: 52mA
Plate resistance: 1.2Kohm
Amplification factor: 52 16 <<<<< selection is necessary
Max resistance in grid circuit: 0.15Mohm

Inter electrode capacitance:
input: 112 pF
output: 1.90.3 pF
transfer: 4.5pF

Greetings
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