cygnus_859

Responses from cygnus_859

Audio Research VT100 MKII retubing blew resistors
The -50V on V7(8) is critical. If it is not correct, I may blow the power tube bias resistors or fuse. 
6DJ8 measurement error on Hickok 600A
I found it is hard to get repeatable readings for 6dj8 tube. When I use 15000 scale, the reading is too sensitive to English position. Every step represent about 500 on the reading. I don't know if I have a bad English.I am still confusing about 6... 
6DJ8 measurement error on Hickok 600A
Thank your for your reply Jea48. I did set the tester as you mentioned. I still get about 7000 reading on new tubes (should be around 9250). 
upgrade from Audio Research SP6C
I may have missed the good side of CAT SL1. I use a Classe CAV150 when I demo it, which it not good enough for the preamp. It didn't give me a vow at that time. 
Audio Research VT100 upgrade to VT100 MKII
Thank you for all your replies. I don't know how big the difference between VT100 and VT100 MKIII, or VT100 vs. VS115? There are not a lot of positive feedback on VT100, but I heard good things for VT100 MKII/MKIII. I feel comfortable on biasing V...