6GH8 substitutes

[Aperna1985]

Hi Guys, I had to take a break from my Zenith 16H23 because I'm getting the house ready for our first baby. Before I put it away I was having Horizontal sync problems. The set will be rock solid and look good, then the picture starts to bend at the top and bottom, then the horizontal goes nuts, I readjust it and it holds for a while then it starts again. It uses a 6GH8 for the horizontal oscillator. I noticed the output of pin 1 was low. I put in a 6EA8 and got the proper 130v coming out of the tube on pin 1 but the lock was even worse. I'm wondering if it's not a good substitute for this application or if there is another problem in the set. Is 6GH8 as bad of a tube as I've heard? Is there a good strong substitute?