voltage check T35/T38

[mete]

I just did the voltage check and all values are within 5% of what is given except T35 and T38. T15 and T18 are ~50V, whereas T35 and T38 are ~43V (-15%). Is that OK having a few values off by 15% whereas others within 5% ?

 

[Paul Birkeland]

That voltage may come up a bit as your tubes get more hours on them.

 

[mete]

So it is OK to use then.

 

[Paul Birkeland]

It depends on whether there's any noticeable performance difference between the channels. It could be that the cathode bias resistor on one side isn't well secured, or you have a backwards cathode bypass cap, or some other issue causing that voltage to be off, or one of the tubes in question needs a few hours of run time to wake up.

Swapping the tubes between sides would help you understand if it's an issue with the build or a tube that needs some time to run in.

 

[mete]

I just wrote in the other thread but to repeat also here, now I measured the voltages again and I see them swapped. The only thing that might have been swapped is the tubes. Shall I just run it a few hours to see if anything changes ?

 

[Jameson]

It’d be easier for us if you could consolidate issues you’re seeing into one thread instead of posting updates in both. PB provided a couple potential fixes above; running it for a few hours was one.

 

[mete]

I am updating the other thread, I only replied here because of the reply here.