Rod Parsons
Friend of Leo's
I have a reissue '63 brown Vibroverb that uses 6L6GC pwr tubes. I also have a pair of NOS Sylvania 5881s. When I bought the tubes from Angela's almost 20 years ago, he told me that they were the equivalent to a 6L6GB. Looking on-line at tubes, I often read that a 5881/6L6GB will substitute for all the 6L6s except the GC version. Will some one please explain why that is??.. Is there a simple mod to enable the usage of these 5881s? Maybe the amp could simply get biased to accomplish that..... Thanks!