2a3 parallel driven 6sn7 schem - diyAudio
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Old 30th November 2008, 03:23 PM   #1
jer3my is offline jer3my  Indonesia
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Default 2a3 parallel driven 6sn7 schem

Hi,
I'm a first time tube amp builder wannabe. i've got a pair of EH 2a3 tubes and a pair of tungsol 6SN7 tubes laying around.
Can somebody please post a good and simple schematic for me to follow please? probably parallel feeded. A bit of explanation of the schem would help me much also. Cheers!
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Old 1st December 2008, 12:34 AM   #2
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Jeremy?
Welcome, your set of tubes is probably the best set you can start out with, take a look at www.angela.com.
Check out the "2001 edition" 2a3 build, very simple & straightforward.
A pair of 6SN7s' give you great flexibility to drive a pair of 2A3s'.
Granted the schemo is for 6SL7 but the schemo can be tweaked for 6SN7. Unfortunately the schemo uses dirt cheap OPTs' and should be upgraded to--- One Electron, Electraprint, Edcor, or if you dare Plitron output transformers.
______________________________________Rick........ .
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Old 1st December 2008, 12:15 PM   #3
jer3my is offline jer3my  Indonesia
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Default any other

any other schems I should consider as a choice?
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Old 1st December 2008, 01:15 PM   #4
kmtang is offline kmtang  Canada
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You better pick the best Output Transformer for your 2A3. Otherwise it will be a waste of the beauty from the 2A3.

I am running it with Lundahl's LL1623 60mA SE OPT. Sounds great.


Johnny
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Old 1st December 2008, 10:35 PM   #5
pageboy is offline pageboy  United States
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On the Angela 2A3 circuit, from a poor ignorant noob, what would it take to use a 6SN7 in the circuit, and what is wrong with a 6SL7?
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Old 2nd December 2008, 12:49 PM   #6
jer3my is offline jer3my  Indonesia
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Can somebody post the resistor values on the angela schematic for 6SN7 as the driver?
cheers
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Old 3rd December 2008, 02:19 AM   #7
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Default A very simple 6SN7, 2A3

Found an even simpler 2A3 amp, by combining these two schematics we can make a very easy to build amp.
First off, thanks to Alessandro Galavottis very straightforward design for 1/2 of a single 6SN7 for a driver, going to a 2A3.
We can use his design for the front end & the angela design for the 2A3. Still working on number crunching for a merged schematic as I'd like to use the easily available Hammond transformers.
_____________________________________Rick.........
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Old 3rd December 2008, 02:34 PM   #8
jer3my is offline jer3my  Indonesia
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The tubes in my possesion are a pair of EH 2a3, a pair of Tungsol 6SN7
and an EH 5U4GB. Will use all of them. parallel 6SN7 will make more output power?
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Old 3rd December 2008, 05:34 PM   #9
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As to my previous post we unfortunately can't 'tweak the 6SL7 circuit to accept a 6SN7 as it would require a full redesign.
Yes 2A3s' in parallel will increase the power output (not the 6SN7s') , but we need to take into consideration if the 6SN7 can drive the increased load, furthur you would need to get two more 2A3s'! And you can't mismatch brands.
Just search "SE 2A3 tube amp"..there are lots of these out there.....especially the 6SN7 variety.
The Angela and Galavottis can be put together...using the Angelas tube rectifyed PS, & the Galavottis amp circuit.the only caveat is dropping the PS from 350VDC to 324VDC....
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Old 3rd December 2008, 06:52 PM   #10
pageboy is offline pageboy  United States
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Thanks for the help.

What is so bad about a 6SL7 in the first place?
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