Problems with biasing my HD130

I have a mm HD130 212 with the transistor bias and
when I measured across 3.9 Ohms resistor I only got about 10mV as the highest value even though I put the bias pot in the highest
position(giving highest bias).
The amp works but I'm a litte bit worried about the bias configuration.
Do anyone know if its a problem?

Could be bad tubes or bad 2N6488.

So the 2N6488 are the same as JE1692 in the schematics?
And how can i check if its bad or broken?