Help with Kit 34 amp

[jiten]

Hi All,
I seem to come on only when I need help so apologies in advance.
1. I was thinking of buying a set of speakers with 4 ohm impedence instead of the usual 8 ohm. My Kit 34 instructions say that the output transformers are for 8 ohms and should not run the amp with 4 ohm for any length of time. Can someone help and explain this?
2. the right channel in my amp works intermittently. A gentle tap ( literally with a couple of fingers on the right of the amp and it works. However I noticed last night that the rear EL 34 of thee right channel was glowing a bright red after about 20 minutes and it appeared as if the whole plate was red hot. the valves are svetlanas and were replaced about 2 years ago. I will do a run of test voltages tomorrow. when it is working the sound is great.
Thanks,
Jiten.