Mastersound Tube amp

You simply turn it COUNTERCLOCKWISE and turn it about a 1/4 turn and it will release. Do not wiggle and pull as mentioned above.

It doesn’t turn counterclockwise, at all. I’ve been getting many responses and they all contradict each other. Please respond if you own the amp. 

When I first got my 845 amp, (cheap Chinese I have to admit), I had installed some tubes in it and listened for awhile. I decided to try some different tubes in it, and one of the 845 tubes would not come out, nor would it rotate in either direction.

I took a good hard look at the tube and socket, figured out the alignment pin in the side of the tube had been knocked out of place. I used a very thin metal screw driver, and managed to drive it in far enough to create clearance for the pin to come loose, then turn the tube counter-clockwise, and remove the tube.

The tube socket got bent out of shape a bit, but I was able to straighten it out ok, and all is well. I suspect you are having a similar problem.

Hope this helps, and you manage to retrieve your tube.

Regards,
Dan

I got it to work. Seems the standard 845 tube comes out by turning counterclockwise 1/4 turn. Replacing it is opposite, 1/4 clockwise turn. People who suggested wiggling it side to side and back for froth have clearly never handled 845 tube. I think it’s irresponsible to comment and give a wrong advice when you never handled this type of equipment. I nearly broke my amp listening to some people here with over 2000 posts. 

Do not wiggle! You must turn the tube counter and then lift the tube out. Roberjerman once again demonstrates the pitfalls of not knowing what he doesnt know. It is completely irresponsible, but all too common on any audio forum. I owned an older Mastersound 845 as well as 300B and 32B integrated amps from this company.