Another SET 2A3 in the world

lquintas · 9th November 2007, 05:35 PM

After a whole year slowly gathering parts all over the world and slowly working (don't have enough time for this), I have finished my first SET 2A3 amp, following the wonderful JE Labs web site

http://members.myactv.net/~je2a3/se300b.htm

The schematic I chose was the stereo SE2A3dx with the James 6123HS outputs

I want to thank you all in the forum who are sharing so much knowlegde and have allowed me, with no experience in this, to be able to build such an amp. I'm not an expert, but it sounds wonderfully. No hum at all (1mV in the output) and power more than enough to make my Dallas II horn enclosures shout.
Only one question: the tubes I am using are 2A3 Sovteks, RCA 6SN7 and Sylvania 76. Is it worth buying better tubes of other brands in order to improve the sound even more? Which ones ?

Thank you very much again

lquintas

lquintas · 9th November 2007, 05:37 PM

Another picture

lquintas · 9th November 2007, 05:44 PM

and a last one

Jeb-D. · 9th November 2007, 07:25 PM

Wow, very nice! Did you cut the wood for the chassis yourself, or did you buy it? Are those Jensen Oil caps I see in there?

I have found Most RCA and Sylvania tubes to be very good. As far as Sovteks go, there have been some I really like and some that are just ok. That is a general statement as I've never worked with thier 2A3's.

lquintas · 9th November 2007, 10:17 PM

Yes, I cut the wood myself, two pine wood pieces 1 cm thick glued together. The capacitors are Angela Instruments' ASC oil caps. Thanks for your comment about the tubes.

athos56 · 9th November 2007, 11:50 PM

I built this amp as my first project! I liked it as well, your looks better then mine did. I'm glad to see that yours looks as packed as mine did underneath. I wish I still had mine, I sold it for parts when I was poor

JandG · 10th November 2007, 01:54 AM

You did a excellent job. I too am building the JE Labs 45 w/ James 6123,My 1st amp & should be up in smoke or singing by tommorrow evening. If I succed, then I will try the 300B version. I know one thing the qulity of the James OT's surpised the heck out of me, I hope they sound as good as they are built. I like the way you mounted your ASC motor runs. I think I will steal that trick, mounting the clamp upside down w/ no visible clamp up top. I like it... Have you tried any other taps..? I went ahead & solder 4-8- & 16 just so I can try them.

arnoldc · 10th November 2007, 02:33 AM

Congrats and nice work!

I also have a JE Labs 2A3 DX and use an all RCA tube complement (76, 6SN7, bi-plate 2A3, 5U4G). The Sovtek is value for money IMHO, I started with that too. The Sylvania 76 is also good as well as the National Union.

I use MagneQuest OPT in mine, the DS-025, but my experience with James says they're very good too. I'm currently using a James JS-6113HS for my 300B.

athos56 · 10th November 2007, 04:44 AM

I liked how the schematic was complete and the suggested iron was on the page, made the build easier. I had no tube guru near by or a good amp meter

so I wasn't ever sure if I had it right

But once it successfully produced music I concidered the who thing a success. I'm going with a 12b4a pre and a pair of mono-blocks next; maybe the PP-C1, or something from dynakit, or maybe the Baby heuy or el-cheapo. But the JE-labs stuff was a good start.

planet10 · 10th November 2007, 05:29 AM

Nice looking amplifier...what speakers are you driving with it.

dave

9th November 2007, 11:50 PM	#6
athos56 diyAudio Member Join Date: May 2006 Location: Yakima, Washington	Hey I built this amp as my first project! I liked it as well, your looks better then mine did. I'm glad to see that yours looks as packed as mine did underneath. I wish I still had mine, I sold it for parts when I was poor

10th November 2007, 05:29 AM	#10
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Nice looking amplifier...what speakers are you driving with it. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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9th November 2007, 07:25 PM	#4
Jeb-D. diyAudio Member Join Date: Nov 2005 Location: SoCal	Wow, very nice! Did you cut the wood for the chassis yourself, or did you buy it? Are those Jensen Oil caps I see in there? I have found Most RCA and Sylvania tubes to be very good. As far as Sovteks go, there have been some I really like and some that are just ok. That is a general statement as I've never worked with thier 2A3's.

9th November 2007, 10:17 PM	#5
lquintas diyAudio Member Join Date: Sep 2006	Yes, I cut the wood myself, two pine wood pieces 1 cm thick glued together. The capacitors are Angela Instruments' ASC oil caps. Thanks for your comment about the tubes.

10th November 2007, 01:54 AM	#7
JandG diyAudio Member Join Date: Jan 2005 Location: Washington State	You did a excellent job. I too am building the JE Labs 45 w/ James 6123,My 1st amp & should be up in smoke or singing by tommorrow evening. If I succed, then I will try the 300B version. I know one thing the qulity of the James OT's surpised the heck out of me, I hope they sound as good as they are built. I like the way you mounted your ASC motor runs. I think I will steal that trick, mounting the clamp upside down w/ no visible clamp up top. I like it... Have you tried any other taps..? I went ahead & solder 4-8- & 16 just so I can try them.

10th November 2007, 02:33 AM	#8
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Congrats and nice work! I also have a JE Labs 2A3 DX and use an all RCA tube complement (76, 6SN7, bi-plate 2A3, 5U4G). The Sovtek is value for money IMHO, I started with that too. The Sylvania 76 is also good as well as the National Union. I use MagneQuest OPT in mine, the DS-025, but my experience with James says they're very good too. I'm currently using a James JS-6113HS for my 300B.

10th November 2007, 04:44 AM	#9
athos56 diyAudio Member Join Date: May 2006 Location: Yakima, Washington	I liked how the schematic was complete and the suggested iron was on the page, made the build easier. I had no tube guru near by or a good amp meter so I wasn't ever sure if I had it right But once it successfully produced music I concidered the who thing a success. I'm going with a 12b4a pre and a pair of mono-blocks next; maybe the PP-C1, or something from dynakit, or maybe the Baby heuy or el-cheapo. But the JE-labs stuff was a good start.

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