Nanao Ms 9 and A68LBT696X 8D Tube

For monitor related issues
Post Reply
User avatar
Panther
Posts: 15
Joined: March 23rd, 2021, 4:45 pm
Location: Schweiz
eBay: the_god_of_gamblers

Nanao Ms 9 and A68LBT696X 8D Tube

Post by Panther »

Hello,

Is it possible to run a MS9 chassis and yoke on a A68LBT696X 8D tube? Will I have geometry issues because the tube is more flat that a A68KJU96X 9D?
User avatar
yosai
Windy City
Posts: 4057
Joined: August 17th, 2008, 5:00 pm
Location: London
eBay: yosai

Re: Nanao Ms 9 and A68LBT696X 8D Tube

Post by yosai »

Swapping the chassis and yoke should work.

Geometry should be fine assuming the chassis works well.
User avatar
Panther
Posts: 15
Joined: March 23rd, 2021, 4:45 pm
Location: Schweiz
eBay: the_god_of_gamblers

Re: Nanao Ms 9 and A68LBT696X 8D Tube

Post by Panther »

Thank you for this info, I like to get away from these MS2931 since they seems not reliable and I prefer the MS9 picture. So I will give it a try!
mikejmoffitt
Posts: 28
Joined: May 28th, 2012, 2:35 am
Location: Tokyo, Japan
eBay: 7raster

Re: Nanao Ms 9 and A68LBT696X 8D Tube

Post by mikejmoffitt »

The MS9 chassis, paired with the *696X tube, will have loud and upsetting HV arcing on the neck. Do not combine them. The MS-293x series connects pin 4 to ground via a resistor, which is critical. The MS9-29, MS8-29, and other chassis do not use pin 4 at all. As a result, ~28kV will be present on the disconnected pin 4, and it will arc to the grounded pin 5 immediately.
User avatar
Panther
Posts: 15
Joined: March 23rd, 2021, 4:45 pm
Location: Schweiz
eBay: the_god_of_gamblers

Re: Nanao Ms 9 and A68LBT696X 8D Tube

Post by Panther »

mikejmoffitt wrote: January 31st, 2022, 11:08 am The MS9 chassis, paired with the *696X tube, will have loud and upsetting HV arcing on the neck. Do not combine them. The MS-293x series connects pin 4 to ground via a resistor, which is critical. The MS9-29, MS8-29, and other chassis do not use pin 4 at all. As a result, ~28kV will be present on the disconnected pin 4, and it will arc to the grounded pin 5 immediately.
That's exactly what happend and is the correct answer here. So this is NOT working. I tried it just a second and switched it off immediately. However the MS2931 still works fine on this tube after all. Thank you for this info!
Post Reply