napalmdeath
Well-known member
As I previously stated when I got the amp, the bias was at 8.3mA, and when I tried KT77's, I had no reading until I cranked the bias, and maxed out at 12mA. I put the 6L6's back in, and biased it up to suggested, (in the manual) to 32mA, all is well..
I picked up my Bias One at my brother's today, and a new pair of E34L's I had over there to try, and check the plate voltage.
The plate voltage on this sucker is 511! And, I could only get the E34L's to 18mA, maxed out. WTF? They're rated 35, which I wouldn't consider cold, would you? Do I need to get my buddy Eddie at Eurotubes to send me a majorly hot, maybe upper 40's, or am I missing something here?
On another note, my math puts recommended 32mA seriously cold! And they recommend EL34's at 38mA which would be seriously hot! A 30 watt 6L6 with plate voltage at 511 should be 41, at 70%, (which I never really go that high), so I settled at 38mA. A 25 watt EL34 or KT77 should be closer to the 32mA.
So, WTF is going on? I'm an EL34 fanboy, and couldn't get E34L's or KT77's remotely close to where they should be. Just over half, maxed out. What gives?
I also have another stupid question. There's only one bias adjustment, yet two test points? What's the reasoning behind that?
Everything aside, I still love it. The 6L6's bias up just fine, but I want to try EL34's, KT77's, or 6CA7's!
I picked up my Bias One at my brother's today, and a new pair of E34L's I had over there to try, and check the plate voltage.
The plate voltage on this sucker is 511! And, I could only get the E34L's to 18mA, maxed out. WTF? They're rated 35, which I wouldn't consider cold, would you? Do I need to get my buddy Eddie at Eurotubes to send me a majorly hot, maybe upper 40's, or am I missing something here?
On another note, my math puts recommended 32mA seriously cold! And they recommend EL34's at 38mA which would be seriously hot! A 30 watt 6L6 with plate voltage at 511 should be 41, at 70%, (which I never really go that high), so I settled at 38mA. A 25 watt EL34 or KT77 should be closer to the 32mA.
So, WTF is going on? I'm an EL34 fanboy, and couldn't get E34L's or KT77's remotely close to where they should be. Just over half, maxed out. What gives?
I also have another stupid question. There's only one bias adjustment, yet two test points? What's the reasoning behind that?
Everything aside, I still love it. The 6L6's bias up just fine, but I want to try EL34's, KT77's, or 6CA7's!