FX Audio 502e-l amp modifications

[Team02]

Hi all.

Just purchased an fx audio 502e-l class d amp for the grand total of 19.99 including shipping from ebay in the u.k

Pairing it with an fx audio tube 03 pre amp. For a budget build 🙂.

Just wondered if anyone had bothered to modify one before. Noticed from looking at pics of the board it has a surface mount ne5332 op amp on there which could be swapped out easily enough and potentially upgradeable capacitors.

 

[Karlsonate]

Did the eBay listing claim the amp's using TPA3116D2, or dual-chip TPA3116 or anything like that?
I have a bad feeling...

 

[Team02]

Hi bud

50%OFF | FX 502E-L Digital Audio Mini Power Amplifiers 75W*2 BT 5.1 HiFi 2.0 AMP Bass and Treble Adjustment Amplify For Home Audio System
https://a.aliexpress.com/_mObc07C

Chipset: CS8673E+ AC6951C+NE5532 +SGM4806

This is the beast in question.

 

[mamocel]

CS8673E...Chinese class D chip...
Same operating voltage as the tpa 3116.
I don't think it's profitable to modify anything...
Very low coast.... https://fr.aliexpress.com/item/1005...list.product.mainProduct&gatewayAdapt=glo2fra

 

[Team02]

That makes sense. They have a range with various upgrades on them so will just go for a 1002a with wima caps and swappable op amps etc .

 

[mamocel]

The amp you mentioned above has nothing comparable....
The fx audio 1002a uses a TDA7498E chip....
Much more efficient...

 

[Team02]

Definately. I'll pick one up in future. I couldn't resist buying the 502e-l for only 19.99.

 

[Karlsonate]

19.99 GBP could get you one of those "Wuzhi Audio" style TPA3116 amps. Cheap as dirt, and best of all, 90% of the time it's using genuine TPA chips.
For the unfortunate 10% however, you will be greeted by these CSR chips.
Many sellers would claim them to be Chinese made "3116 substitutes" or "domestic chips"...
I'm curious about how they sound though.

 

[Team02]

https://www.ebay.co.uk/itm/334965547701

I need to stop browsing ebay though, as I'll keep buying stuff 🙂.

 

[Team02]

| 160WX2 Class D Digital Power Amplifier TDA7498E TDA7498 Board Dual Channel Home Audio Stereo Amplifier
https://a.aliexpress.com/_mMgH14Q

 

[denbret]

Instead look at an Infineon MA12070 or TPA3221.

 

[Team02]

Thanks bud.

I went for a the fx audio 502s pro for 35 pound earlier today. I already have a 24v power supply I can use with it.

Found a thread on here before discussing it and upgrading it. It has socketed ne5322 op amps.

It should hopefully be enough for the bedroom.

 

[Karlsonate]

On a Class-D buying spree, I see 🙂

 

[Team02]

Me: I need some budget audio equipment in the spare bedroom to connect the pc to instead of the tv speakers.

Also me: buys the entire fx audio chi-fi product range in the space of a month

🙂

 

[Overeem]

fx audio 502s pro

For 35 pound you have a nice little amp. It can sound very nice. I liked it very much.

After modding it gave a tube like sound, but then the positive aspects... Very nice highs, first impression was, "it sounds dark", but its not.
Pitch black, then the tick of the top of the stick on the plate, that starts to treble and give a very beautiful colorful sound, then pitch black again. Most beautiful cymbals I have heard so far. But due to many film caps soldered at almost every cap.

 

[Karlsonate]

It's weird how they haven't produce a TPA3255 amp yet, when a 3251-powered amp already exists.

 

[Team02]

Re: desoldering caps on these fx audio boards.

I've had no luck so far trying to get a cap to desolder on the fx audio tube 03 board.

Ive got wima caps to replace the stock ones on it. It's lead free solder on the board. I'm trying to use a de soldering pump and it's not having it.

Probably try feeding some lead solder into the joints and then use the pump!.

 

[Team02]

The legs on the cap are nearly the size of the through hole which doesn't help.