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THD+N 30th November 2010 08:30 PM

Another 2A3 build
 
3 Attachment(s)
Here are a few pix of my Stereo 2A3 amp. The small foot print, is very heavy, about 50lbs, it is like picking up Lead or Gold, but in this case Iron.

Iron is from Edcor. 6SL7's and 5V4 are NOS US tubes. 2A3B's are Shuguang single plates.

vinylkid58 30th November 2010 08:49 PM

I like your work "under the hood", and the compact footprint.:up:

jeff

Mr. Zenith 30th November 2010 09:39 PM

Oh yeah... Excellent work! I love it when a plan comes together. Could you post a copy of the schematic?

jonboy 30th November 2010 10:07 PM

What make are the transformers?

tim614 30th November 2010 10:09 PM

LOVES THE LAYOUT!!!!!!!!

levelfive 30th November 2010 11:31 PM

Congratulations!

Point-to-point wiring, buss grounding, tube rectification, mmm... :lickface:

What about a schematic?

tinitus 1st December 2010 12:27 AM

Quote:

Originally Posted by THD+N (Post 2382663)
Iron is from Edcor.

and nicely repainted ;)

there's a lot of good knowledge in those pictures

THD+N 1st December 2010 12:41 AM

I do not have a schematic drawn, but will draw one up and post in the next day or so.

Here are the Edcor model numbers used:
Output transformers are - CXSE25-4-2.5K
Power transformer is - XPWR118-120

For the money, the Edcor output transformers are definitely the "best buy". They have great low end extension and good high frequency response. My measured frequency response (-3dB points) is 7Hz~22.5kHz.

There was a strange low frequency anomaly (+ 0.5dB bump) between 5Hz and 20Hz, so I formed a low frequency cut-off with an input cap that brought my frequency response up smoothly starting around 7Hz.

I'll post a FR graph (with and without input cap) for comparison for those who are interested.

Ty_Bower 1st December 2010 01:45 AM

Nice chassis. What was its previous occupation?

Matt BH 1st December 2010 01:50 AM

Nice:)

How did you get the crackle looking paint?

Cheers Matt.


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