Bias for Jolida 502 P Amplifier

Hi Ejman

Please don't start with rolling tubes until you have spent A LOT of time with the 502P first.Definitely let it settle in.

For me I believe the red LED lights should be on all the time indicating that the amp is properly biased. Normally I turn on my system along with the 502P and I don't listen to music until all the LEDs are illuminated and steady.

Regarding tube rolling I say follow what Wolf did and not what I did. Wolf has the discipline to keep his tube set-up pretty constant while I kept swapping tubes. I've got a box of all sorts of power tubes and preamp tubes in my closet ready to swap out for the 502P. I had to write down all the combinations I could do I have that many tubes.

I found a non edgy sound with Tung Sol KT-120s, Tung Sol 12AT7 and Mullard 12AX7 re-issue. It was a bit mellow for me though.

Keep enjoying your Jolida.

Thanks guys. I've doing the adjustments after waiting about 10 minutes for the amp to warm up. (The manual says wait 5 minutes) but I think Bombaywalla's suggestion of waiting 30-45 minutes makes sense as the amp continues to warm up quite a bit over that time frame. But right now it's sounding wonderful so I think I'll just listen and smile...

FYI-upgraded tubes will yield significant improvements. I went to KT88's with great results.

Thanks for the info Tbromgard. Which brand KT88's did you prefer and what improvements did you notice?

I went with a KT88 Gold Lion tube package specific for the 502 by Upscale Audio in CA. Cant rec it highly enuff Check out the website - they ship. Improvements across every aspect of performance.