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Old 31st May 2011, 10:37 PM   #1
tony Ma is offline tony Ma  United States
diyAudio Member
Join Date: Feb 2011
Default Mods Xiang Sheng 728A

Hi all,

I just want input for this Xiang Sheng 728A I want to mods it
This amp using 12AT7×2pcs, 12AU7×2pcs, 6Z4×2pcs
My questions should I change
  • Tube to brand telfunken / mullard or any suggestions
  • Upgrading Capacitor? Which one I should upgrade
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File Type: jpg 728 Schematic.jpg (56.6 KB, 442 views)
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Old 22nd June 2012, 03:03 AM   #2
diyAudio Member
Join Date: Apr 2011
Hi Tony,

This unit is very very popular in China. It sells around 15 units a month. However, it seems that it hasn't really made its way among foreigners.
I just ordered mine yesterday and I am going to HK to pick it up next week.
Did you find any info with regards to mods? By speaking with the factory I understand that they have already improved a lot of the weak components from the 1 st version (the one from 2006) in the new model (including the tubes from 6N1 to 12AT7).
The lady from the factory said that their clients are actually quite happy with the stock tubes.

FYI, these are a few of the tubes that the unit can cope with (according to them):
12AT7 can be replaced with ECC81, 6201, 12AT7GT, etc.
12AU7 can be replaced with ECC82, 6N10, 6189, 12AU7GT, etc.

Did you try any other tube? Any mods?

Happy with the unit?

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Old 23rd June 2012, 03:09 AM   #3
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Join Date: Feb 2012
Location: Tamper, FL, USA
I stumbled upon this unit. I am trying to not buy it! Here is a good review but in Spanish. Perhaps Google translate will help. Also in that thread, is a link to a really thorough upgrade of a similar unit...

Análisis de un amplificador chino
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