I've had a bad day!!!...please help!

[Gerry]

In the last 72 hrs one of my Kel80s has just started to fade out and not work.
I realised that the 6AU6 was not working from time to time.
I swaped it and checked all the joints esp. on the heater links.
It still fades...then after 5mins comes back on.
I have checked the voltages....bit strange!

Pin 3 (H) to pin 4 (H) = 0dc (should be 6.3dc)
Gnd to pin3 (H) = 2.42 dc (should be 6.3dc)
" pin 4 " = 2.42 dc " "
" pin 7 (K) = 0 dc " 1.5 dc
" pin 5 (A) = 170 dc " 125dc

What could it be...the rectifier???? Or (which is very possible) am I missing something obvious?

And to top it all.....I broke the cantilever on my DL103 while this was going on....great night!!!

Any help much apprieciated

Cheers
Gerry