Re: Another DIY SS Amplifier with NVA Boards
Posted: Wed May 11, 2022 11:34 am
The stepped attenuator has certainly improved the amp’s performance, but anything would have been an improvement on the crappy carbon pot I had in there. Just shows the importance of the quality of the volume pot and selector switch, in the scheme of things.
There is no artifice in the sound coming from the speakers; layer of hash removed and all that clichéd stuff. You only notice hash when it is suddenly absent.
I also flipped up the amp boards and put the feedback resistors back in their allotted places. The inside had become an utter rat’s nest and totally offended my aesthetic sensibilities, hence the moving of the phono board and the resistor relocation. It turned out that I was out of 18K resistors, but I did have a few 15K values.
Managing to find a pair that matched, these were installed: one in each board, so strictly speaking, the boards are no longer Richard’s intended design and I’m sure I would have got a right bollocking if he was still here and I had been stupid enough to let him find out. But unlike when I put 10K in the feedback position, 15K has not produced boring sonics, so I’m happy with the results.
Three weeks I lasted before the DIY bug hit again.
There is no artifice in the sound coming from the speakers; layer of hash removed and all that clichéd stuff. You only notice hash when it is suddenly absent.
I also flipped up the amp boards and put the feedback resistors back in their allotted places. The inside had become an utter rat’s nest and totally offended my aesthetic sensibilities, hence the moving of the phono board and the resistor relocation. It turned out that I was out of 18K resistors, but I did have a few 15K values.
Managing to find a pair that matched, these were installed: one in each board, so strictly speaking, the boards are no longer Richard’s intended design and I’m sure I would have got a right bollocking if he was still here and I had been stupid enough to let him find out. But unlike when I put 10K in the feedback position, 15K has not produced boring sonics, so I’m happy with the results.
Three weeks I lasted before the DIY bug hit again.