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In Reply to: RE: xiang sheng 708B posted by SOUNDY on August 27, 2016 at 03:31:41
It won't be worth the time and cost if you have to pay someone else to work on this.
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Buy Chinese. Bury freedom.
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Thanks for the advice, but seeing as i paid nothing for it (a gift) I doubt buying another preamp would be saving any money.
What costs for parts and labour are you calculating to give such advice ? how much work would be needed ?
Thanks,
Some things to look for:
1. Is the circuit copied from something else?
2. But it was a bad copy because
- some components are missing or
- have the wrong values or
- it was wired wrong.
3. It was not a good circuit to perform its function
3. Cheap and defective parts.
4. Bad soldering
5. Safety violations.This is why the previous suggestion was made to get a new amp. If you are intent on fixing it, Google "xiang sheng 708B tube headphone/preamp" as there are several posts on head-fi.org about modifying it.
$158! Come on.
Edits: 08/27/16 08/27/16
Hi frihead89,
For clarity I'm not suggesting there is a fault of any kind, just a lower quality sound compared to my other gear.
I'm sure corners have been cut which is how they get their price down as you mentioned.
Point is it was a gift so cost was $0.00 for me and the threads on other sites have links and schematics for members only to download.
Rather than join another site I was hoping for some input from audio asylum seeing as I'm a member.
Hopefully help is on its way !
The fact that you received this for free doesn't remedy any of the problematic issues that typically accompany Chinese equipment. The characteristics of audio gear are inherently linked to the level of engineering design, quality of components and the build. There's also the issue of replacement parts if a major component fails. My advice that you consider something else was based on all of this. You'll be miles ahead by Ebaying this thing and putting the mod/repair money toward a more substantial piece of equipment.
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Buy Chinese. Bury freedom.
hi triode kingdom,
im learning about upgrading hifi so cheap chinese tube gear i havn't paid for seems a better place to start.
my hafler and arcam gear isnt something i'd want experiment with and buying a uk made croft amp would be over my learning budget.
If you are going to replace the power transformer, caps, rectifiers, sockets, tubes, wire, volume pot, RCAs, headphone jack, circuit board, yes it will be better but it is still going to be the same crappy circuit. It will just be a lot easier to purchase a magic fuse and power cord and convince your self of improvements.
hi chip647,
"If you are going to replace the power transformer, caps, rectifiers, sockets, tubes, wire, volume pot, RCAs, headphone jack, circuit board, yes it will be better but it is still going to be the same crappy circuit"
wouldn't that be a new amplifier ?
Much of the quality of a amp is in the circuit design. The key contributor to the sound quality is how you match the load of the tube to the impedance of the headphones. You can replace all the parts with fancy parts, but that may not improve anything.
A few users who modded it reported "better" sound than the stock, but admittedly not great.
Is, you need to learn how to DIY. We get it was free, it is a good place to start to learn. However if your paying someone else to do the work you throwing good money after bad.( to put it another way...You can't shine s#!?
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