Would you pls help.

tanongs · 5th August 2008, 03:56 AM

I am very very new in tube amp. I had 2 RCA 2A3.
I would like to start with this tube. Any one had successfull schematic of this tube apm.

Pls post for me.

Thanks you very much.

sorenj07 · 5th August 2008, 04:52 AM

http://tinyurl.com/55p9vf

Richard Ellis · 5th August 2008, 07:54 AM

As you can see by the link there are just about a million different schematics available for the 2A3....you have a very popular tube & the possibilities are endless.
What is it you would like to build with your 2A3....something simple?...Or something complex?
Have you constructed any other type of audio equipment before?
Do you have any formal training in electronics?
Are you aware of the cost of building an amp.....even if you do it yourself?
Just trying to help you out here, OK?
___________________________________________Rick... ...

kmaier · 5th August 2008, 09:47 AM

Would suggest you have them tested to ensure they are good working tubes before you go down the path and expense to put together an amplifier for them. In general, NOS 2A3 tubes can cost quite a bit and not all are equal. A single 2A3 in SET operation can deliver from 3.0-4.5 watts depending on the design and operating parameters.

Regards, KM

tanongs · 5th August 2008, 12:53 PM

Thanks sorenj07 and suggestion including idea of Richard,
I had very little knowledge in tube amp but useto build
OTL,OCL amp since vocational school. I will start with simple SE.

smbrown · 5th August 2008, 09:29 PM

Not trying to take over the thread, but help me understand - on the schematic by Shishido (sorry, don't know how to post it here, but it's in the above link), what is the reason for the 22k 3W resistor? Looks like it just provides a PS shunt to ground, back through the 2A3 cathode resistor. Does this do more? Why not just drop it right to ground instead of through the 2A3 cathode R?

Thanks!

5th August 2008, 03:56 AM	#1
tanongs diyAudio Member Join Date: Jul 2008	Would you pls help. I am very very new in tube amp. I had 2 RCA 2A3. I would like to start with this tube. Any one had successfull schematic of this tube apm. Pls post for me. Thanks you very much.

5th August 2008, 12:53 PM	#5
tanongs diyAudio Member Join Date: Jul 2008	Thanks Thanks sorenj07 and suggestion including idea of Richard, I had very little knowledge in tube amp but useto build OTL,OCL amp since vocational school. I will start with simple SE.

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5th August 2008, 04:52 AM	#2
sorenj07 diyAudio Member Join Date: May 2006	http://tinyurl.com/55p9vf

5th August 2008, 07:54 AM	#3
Richard Ellis diyAudio Member Join Date: Sep 2006 Location: Mar del Plata, a BIG seasonal getaway city, can see the Ocean from our residence.	As you can see by the link there are just about a million different schematics available for the 2A3....you have a very popular tube & the possibilities are endless. What is it you would like to build with your 2A3....something simple?...Or something complex? Have you constructed any other type of audio equipment before? Do you have any formal training in electronics? Are you aware of the cost of building an amp.....even if you do it yourself? Just trying to help you out here, OK? ___________________________________________Rick... ...

5th August 2008, 09:47 AM	#4
kmaier diyAudio Member Join Date: Jul 2007	Would suggest you have them tested to ensure they are good working tubes before you go down the path and expense to put together an amplifier for them. In general, NOS 2A3 tubes can cost quite a bit and not all are equal. A single 2A3 in SET operation can deliver from 3.0-4.5 watts depending on the design and operating parameters. Regards, KM

5th August 2008, 09:29 PM	#6
smbrown diyAudio Member Join Date: Jun 2004 Location: Portland, OR	Not trying to take over the thread, but help me understand - on the schematic by Shishido (sorry, don't know how to post it here, but it's in the above link), what is the reason for the 22k 3W resistor? Looks like it just provides a PS shunt to ground, back through the 2A3 cathode resistor. Does this do more? Why not just drop it right to ground instead of through the 2A3 cathode R? Thanks!

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