Originally Posted by
petrat
Alan is correct!!! DO NOT DO IT, YOU MAY WELL DAMAGE THE AMPLIFIER.
Each 6SN7 has two triodes in it, the 6J5 has only one ... so they are different internally and use different pins to connect their various bits to the valve base. Putting the 6J5 straight into your amplifier as it is will result in the wrong pins being connected. The amplifier will need to be re--wired before you can use the 6J5s.
Also in the interests of accuracy, the 6J5 is not 'half-strength', it actually has more gain than one triode of the 6SN7, the latter only having more gain in this application because AN use both of the triodes in its tube, doubling up.
Ok, I am officially giving up on the idea of trying out the 6J5 Thank you Peter and Alan for your good advice!
I will get the technician to put different resistors in the amplifiers to lower the gain. Apparently he has been talking directly with AN, so he will get the correct resistors to install and that will lower the gain somewhat. I will say as I did above that it still sounds terrific and I am merely trying to get that last bit out of it. Interestingly AN puts grounding posts on all of their gear and I really like that idea to help reduce any grounding issues. I was short one grounding cable, so I couldn't run one from my DAC to my preamp. One just arrived in the post this afternoon, so I will have to hook that up and see if it lowers any background noise.
Vertere SG-1 Turntable / Audio Note IO Gold MC
Audio Note AN-S8L MC Transformer
Audio Note Pallas I/C (SUT-Preamp)
Audio Note M6 Phono Preamp
Audio Note CDT 3/Audio Note 4.1X Balanced Signature DAC
Audio Note Kassai Monoblocks
Audio Note Sogon Interconnects
Audio Note Pallas Interconnects
Audio Note AN-Vx Interconnects
Audio Note Sogon Speaker Cables
Audio Note AN-E SPE HE speakers
Audio Note ISIS Power Cables
Loricraft PRC-4 Record Cleaning Machine