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I'd start by having the hammers voiced to sound something like a Blüthner should sound.

I'm not where I can listen to the YouTube audio on either headphones or decent speakers but I think I can hear what is bothering you.

First, I doubt it is bridge pins or bridge related.

The voicing sounds very bright -- almost strident (but this may be exacerbated by my computer speakers) -- for a piano that historically has been noted for having a warm, almost mellow sound. I'd start by having the hammers voiced to sound something like a Blüthner should sound.

Strings should be “level.” This might be part of the problem. And while the technician is in there leveling strings he/she might also check the contour of the V-bar. You’d like it to be smooth and nicely rounded—a radius of about 1.0 to 1.5 mm should be about right.

Have your technician make sure the bearing bar is installed to the correct height.

While this does sound like a string termination problem at the V-bar end it could also be something as simple—and as difficult to track down—as a loose hinge or other piece of hardware. Check for loose things anywhere in, on or around the piano. These things, by the way, are also made worse by the rather hard tone of the piano.

A few other ideas come to mind—not likely but still things to check—loose hammer heads, cracked hammershanks, loose hammer butt action centers, etc.

ddf

If it were my piano, I'd check everything else that Del suggests first and see that the plate is properly secured, none of the pressure bar screws are loose, and the action rails are firmly fastened to the brackets. Are the coils round the pins as tight as they should be? All these things should be ok as the piano has just come from the restorer but strange things can happen along the way.

One quick question regarding the V-bar. On this piano, the V-bar is around 4-5 mm in radius, and has no pressure bar on the tenor section. Yes, there are signs of wear in terms of the gilding (it is 80 years old) but it is hard to find evidence of grooves, though perhaps I need to invest in a magnifying glass (or new spectacles). Either way, is this an unusually large radius for a V-bar, and could that contribute to termination problems?

It's not really a question of "grooves." Take a look at the contact point of the strings against the V-bar. Look closely. Typically the top surface of the V-bar (a misnomer, by the way) is rounded. It really shouldn't be. From the point of contact that constitutes the termination of the speaking length of the string it should drop away quickly.

If the slope of the V-bar on the speaking side is too gradual the vibrating string can buzz against the bar creating just the sound you are hearing. I am currently in China and I cannot view anything on YouTube here so I can't go back and look at the string termination configuration in your piano but...if there is not pressure bar in the tenor section I'd guess (not being able to see or hear your piano) that this is where the trouble probably lies.

If this does prove to be the case the easiest solution is probably going to be to move the strings out of the way and grind the speaking side of the V-bar down a bit. Just enough that there is no possibility of the vibrating string coming into contact with the V-bar.

I wonder about the two bottom coils in this image (I suggest you blow them up on screen - Ctrl+). Are the coils as tight as possible with the at right angles into the becket. If not the problem Del mentions could be induced or exacerbated.

PS The bottom right coil appears to have its wire bent round in a loop before it goes into the hole in the pin. To my mind this would mean the string is not properly terminated at the pin which, in turn, will mean it will not be properly terminated at a V-bar, or an O-bar, especially in the absence of a pressure bar. Does this make sense, Del?