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 Post subject: 2A3 Stereo Amp Build
PostPosted: 10 Nov 2018, 20:21 
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Joined: 22 Feb 2017, 07:55
Posts: 21
Hello All,
First time posting, but not a first time builder.

I just finished a 2A3 stereo build and I thought I would share it. I am trying to decide what type of wood to add. The wood in the picture is oak. The final build will have wood on the front panel as well as the sides.


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 12 Nov 2018, 18:13 
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Joined: 22 Feb 2017, 07:55
Posts: 21
More data..


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 13 Nov 2018, 12:11 
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Joined: 01 Nov 2015, 09:31
Posts: 13
How does it sound? I like to build a 2A3 PP but the schematic looks weird, one channel runs on 5U4, and another runs on diodes. I wonder if the sound would come out different on each channel so I haven't done anything yet.


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 13 Nov 2018, 13:00 
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Joined: 22 Feb 2017, 07:55
Posts: 21
Well my opinion is biased (since I built it), but it sounds very good if you're into single-ended triode amps.

I'm not sure why this 2A3 PP amp design uses a tube rectifier and diodes. Perhaps it is a mistake on the published schematic or intentional to prevent someone from copying the circuit who has no circuit knowledge.

I would not build it as indicated on the schematic.


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 13 Nov 2018, 16:49 
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Joined: 23 Feb 2017, 02:02
Posts: 306
THD+N wrote:
Well my opinion is biased (since I built it), but it sounds very good if you're into single-ended triode amps.

I'm not sure why this 2A3 PP amp design uses a tube rectifier and diodes. Perhaps it is a mistake on the published schematic or intentional to prevent someone from copying the circuit who has no circuit knowledge.

I would not build it as indicated on the schematic.

Maybe tube rectifier for front end to get nice sound then diodes to supply high current with low voltage drop for push pull output stage

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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 13 Nov 2018, 18:28 
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Joined: 01 Nov 2015, 09:31
Posts: 13
I did send them a question but they couldn't give me any answer. I have KT88 and KT120 PP but I wonder if 2A3 sounds better or not or maybe sound in different way.

Your amp build looks great, very neat.

ILoveHiFi
By looking the schematic, it doesn't say anything. They sell PCB which I saw the diodes on it. I couldn't trace down where it's going to. Or maybe they have incomplete schematic so nobody can clone.


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 13 Nov 2018, 21:27 
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Joined: 28 May 2008, 21:53
Posts: 4575
Location: Winnipeg, CANADA
Very neat and tidy build. The amp looks great.

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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 25 Nov 2018, 17:08 
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Joined: 22 Feb 2017, 07:55
Posts: 21
I am very happy with the performance of the Edcor output transformers. No doubt a great value and very good quality.


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 27 Nov 2018, 22:13 
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Joined: 21 Jun 2017, 16:00
Posts: 10
hello THD,

I am also very interested on building a 2a3. Is it possible if you can share schematic and more information regarding the amplifier? Your build looks very very nice and the layout of the wiring is amazing. I hope to one day get to that level.

thank you


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 Post subject: Re: 2A3 Stereo Amp Build
PostPosted: 28 Nov 2018, 06:50 
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Joined: 19 Oct 2018, 15:30
Posts: 69
Location: Montréal, Québec
Your amp looks really clean! I love how the components are placed inside


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