Home Tweakers' Asylum

Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

Really? I disagree.

"Use speakers that will accomodate the amps (SIC) range of power and be happy."
Huh? 'Strictly' said NOTHING about the amp not having enough power output.

"Jolida amps deserve to be as they are."
You write of it as if it's human. I'll agree that it should be be respected but NOT that is it's inviolate.

"It's more logical to upgrade to a better amp than invest time and money into an already good amp."
Maybe to you it is, Scott, but only about 0.01% of the equipment we buy is built absolutely as well as it can be. Replacing medium-quality parts, expecially in Chinese-made equipment, is an excellent way to improve the sound coming thru them. Chinese-made amps may be great values, as my ASL 805 DTs are, but they're FULL of just-good-enough parts. Buying new equipment can be very costly; buying new 5-star caps can be done for maybe $50 - $100.

"I would recommend using 91dB or higher speaker."
And now we're buying new SPEAKERS!!!!!!! Not-enough-power is NOT the problem!!!!!!!!!!!!!!!!

"Jolida is always warm pleasing and fun to listen to."
That may be quite correct, but that doesn't mean we can't rather easily make it better.

Strictly, I recommened you first dig up a schematic diagram AND SERIOUSLY upgrade your electronic skills. If you don't have a schematic, you'll have to trace circuitry to determine the function of some of those pieces. Also, working in amps that store high amouts of energy at 400VDC can be LETHAL. I think you need a more-experienced coach who can guide you thru this.

That said:
1. 'Those green things' are capacitors, not resistors. The dozens of resistors are on the top of the board. The 4 caps in line PROBABLY are the coupling caps and PROBABLY they're 0.22uF @ 400VDC. Probably you could upgrade the sound simply by replacing those. Brand of cap? Pick your poison; there are dozens of fine caps from which to choose. Probably I'd use TRT DynamiCaps or Mundord M-Cap Sup. S/Os.
2. The 2 '4700 J' caps may be 0.47uF front-end couplers. If they are, same recommendation as above.
3. I'd add some serious bypass caps to the main power-supply caps, the 220uF Rubycons.
4. Probably there are dozens of other improvements to be made, but...

...you really will benefit from a schematic diagram and a hands-on assistant. Maybe another inmate has a schematic.

Good luck and BE CAREFUL.


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