Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source?*1 I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving voltage across a grid resistor. I endorse only this application with THIS tube and I am not qualified to talk about sound of this tube in other configurations as I did not like this tube in any other configuration I have tried.
About the oscillating. Yes, a grid resistor, a ferrite bid in the grid do help. Some of them oscillate more than another however. The 3,8v for bias is about right. The cathode bias with batteries – I do not know about that.
About the vintage - it is universal rule for tubes and for Russian tubes in particularly – the older tube are better than newer. The presence of OTK logo I find is irrelevant but the fact that the tube 7 years older is good.
|
|