Screened cable for rewiring valve amp

[Barbieboy]

Hello,
I wish to upgrade the signal cable inside my Yaquin MC-10L tube amp. Contacted Chord Co who said they don't supply cable off the reel, but recommended:

"silver-plated cable with PTFE insulation and ideally a two layer foil and braid shield"

Any cable suggestions welcome, want this to make a worthwhile sonic improvement

Thanks

[SY]

That's a nice recommendation if you like risking triboelectric noise.

What is the deficiency in the wire that's in there already? Is this wire already contained within a grounded metal chassis?

[Barbieboy]

Hello and thanks for your message,

Here is a pic of the input wire (Black 2 core) on the right going to the preamp board and the yellow arrows pointing where it changes to 3 core when feeds the EL34s

[SY]

But how have you determined that the wire is limiting the performance and in what way is it causing problems? If you don't have a clear idea of what you're trying to fix, it's unlikely that throwing random solutions (especially recommendations by salesmen) at the problem will solve it.

If you want to make sonic improvements to the amp, it's best to figure out what the deficiencies are, then attack the root causes- usually design, layout, and grounding issues for Chinese amps. Wire is generally pretty far down the list.

[Barbieboy]

I've changed the amp's caps to wonderful effect, little in outlay and catapults the amp into a different league. Rolled the valves too which made a subtle but nice improvement. Tried a few different interconnects and this made me think the internal signal wire maybe sonically crap ?

[SY]

Post a schematic and then let's talk. If changing caps made a huge difference, that suggests that there are some serious design flaws.

[Barbieboy]

Ok thanks, interesting Will try and get a schematic. there is a group here for the amp:

Yaqin mc10L

[Barbieboy]

Also plan to bypass the input selector as don't need it and replace the vol pot with a stepped one

[Eli Duttman]

Here is a pic of the input wire (Black 2 core) on the right going to the preamp board and the yellow arrows pointing where it changes to 3 core when feeds the EL34s

Connecting a shield (screen) at only 1 end is correct technique. The idea is to dump noise into the chassis. The 2 conductors inside the cable carry the signal.

Discriminate between signal ground (earth) and chassis ground.

[Barbieboy]

Thanks Eli D

The schematic: