Hi
I am new here, so hello to everybody, its really great forum.
I have cayin a55t (fantastic amp) and after about 50 hours i checked bias with voltmeter. it is 480mV on all 4 output tubes. I then used another voltmeter to recheck and i still was 480.
In manual it says between 350-400!? So i biased to 400mV. Is that ok? when amp gets hot after playing music loud bias is slightly (10mV) higher. then it goes down.
I have stock tubes. When checking I have connected speakers and cd player, no signal playing and volume pot at lowest position. is that correct procedure?
Also i want to buy even better tubes: I am considering gold lion reissue kt88 and Tung-Sol 12ax7 reissue. (any other suggestions?)
For 12au7 I will choose between:
rca 5814a (50$) triple mica similar to JG-5814 tubes from GE
La Radiotechnique 12AU7 (40$) - like mullard
JAN-Philips 5814-A (18$)
I dont want to lose gain, or base extension, but i would like triode mids with UL slam! can someone who tried similar tubes recommend what to do?
Also, don want to much "hot" (warm) sound but neutral, maybe slightly warmer then with stock tubes.
Thanks