CA 340A SE LM3886 based amp - Upgrade advice please.

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The M-Lytic caps are great, and they go against the standard audiophile rule that bigger (physical dimension) electrolytics are better, which makes them convenient for cramming big smoothing in.

They are actually the same value as the stock CA caps (10'000uF 50v) but physically smaller. Dia is the same but they are about 5mm shorter. I could have fitted the 15'000 uF but opted to keep to the values CA selected.

They are here in Canada, not the good ol USA.

Oops! :headbash: I totally didnt realize! Sorry.

Mike.

(PS: Just been listening, HF seems a tad more extended, bass deeper, more detail seperation. I'll evaluate properly after a couple of days)
 
mikesnowdon said:

I need ideas on how best to use the Kimber 8TC for the ouput re-wiring?
cables that put mechanical stress on solder junctions are a absolute 'no go'.
Also cables with large diameters in general are not useful, they give bad solder junctions with the comparative small eyelets on the pcb and soldering them requires often more heat than the thin pcb tracks can stand.
I would suggest 0,5-0,75mm2 multi-stranded speaker wire for such reworks.
Those with soft, transparent insulation are easy to bend and don't put to much shearing forces on solder junctions.
Tinning and soldering them is not very difficult.
regards
 
The binding posts are PCB mount and the sig and return both go directly to the PCB.

An externally hosted image should be here but it was not working when we last tested it.


I was originally going to move the resistor on the output to inside the coild and use the vacant hole to wire in some cable directly to the binding post. Got it?

l_af5ef1d677825000faaf26d88f7905e8.jpg


I still want to do this. However, the Kimber is chunky so I'd rather not attempt to solder it directly to the PCB. Understand?

This is why I am looking for 'a pair' (1 per chip) of screw terminals to solder in where the resistor would be.


All clear now?

😀
 
Another connection isn't going to help sound quality. See if you can solder it in directly... just a couple of strands of 8TC won't stress the board if you're careful.

Don't worry about the spare 8TC - put top quality RCAs on it and use it as an interconnect (~£200 level of interconnect).

Simon
 
mikesnowdon said:

All clear now?
I'll give it a try! 😀
I don't think the resistor via will support the screw terminal.
It would take a really decent pad or via for such a terminal, because the terminal does not isolate the pcb from the cable.
The pad and solder junction will still have to deal with the cables forces and need therefore be rather large.
Still a flexible cable is better with screw terminals, than a rigid one.
A 0,75mm2 wire has a slightly larger cross section area than a 20mm wide pcb track.
This is not bad at all. So I stick to my recommendation.
Maybe single strands of the Kimber cable do work for you, I can't judge from here.
regards
 
I don't think the resistor via will support the screw terminal.

The idea was to glue the terminal to the top side of the PCB. Then solder the bottom, if you know what I mean?

Simon raised the point of trying not to have too many joints,m a good one. So I think I'll scrap the idea and just solder the wire in to the PCB.

Mike.
 
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