Mapletree Ultra 4A SE - mods


Any thoughts on replacing the stock PS to preamp umbilical cable with a better one? Revelation Audio's product (silver wire) is well known to improve the Mapletree's sound, but my DIY instincts are strong. Has anyone tried to used different wires and what was the end result? BTW, what is a good source for teflon shielded cryo silver wire?

2nd mod, how about bypassing the channel level controls? Don't need them nor use them. Easy mod to implement and reverse. Wondering if the sound would improve by removing this pot from the signal path.

Regards,
alex333
My key policy in 35 years of amplifier design is KISS - keep it simple sweetheart.

Removing a potentiometer from the signal path is a help towards that and could result in a noticeable improvement - depending on the quality of the pot - and very few are any good, in my opinion. And as you say, something easily reversable if it doesn't work out.

Changing the wire in an Umbilical cable is not so clear cut, if the amp is designed well it should make no difference as the sonically affecting powersupply filtering needs to be done RIGHT at the actual amp itself, not back at the powersupply. IMO, certainly not worth spending big money on a boutique silver cable. And if you want to try it, why not make a new silver umbilical yourself?

Regards, Allen (Vacuum State)
bypassing the channel level controls?

I wouldn't. Have you tested your channels individually at your listening seat? I tested mine (250Hz; 500Hz; 1kHz) and discovered that the left channel was off by -3dB from the right. Why? Perhaps my room (asymmetrical, different openings left/right side)? Or tubes? Not sure, but am glad I discovered this. And glad I have the individual channel levels on my Mapletree Audio 2A SE Linestage to correct.

You may wish to check this out as well.
Rockadanny, I have channel level control on the MC7200, so I can handle any differences in output that way. Actually, I'll be checking that now that you mentioned it, hadn't thought about it before, and I know for a fact the room is acoustically a disaster.

Re the umbilical cable, I've read and been told by multiple owners of the Mapletree that it makes a big difference in sound. The stock one is lamp wire, and going to silver is a good improvement. I've found VH Audio sells the silver wire, but I'm wondering if there are other sources I've missed.
why dont you consult the good doctor?
I'm sure he will be glad to assist with improvements.