user 125886
Member
- Joined
- Jun 30, 2021
- Messages
- 12
Hi Everyone
A few months back I completed my EZ1290 build. However, I did not go completely by Martin A's build guide. I designed my own simple linear power supply using an LT317 voltage regulator. It worked great. I also decided to replace all the Vishay electrolytic caps with the fancy Nichicon UKA "audio grade" caps. Other than that, all the components are exactly like everyone else's EZ1290. Also, I went with the MPSA18 transistors.
The preamp has amazing dynamic range, it has tones of headroom, and no grounding problems. However, it sounds a little bit "tinny". I can't say it's all the way "tinny" cause there is midrange and bass, but it's edging towards "tinny-ness". I can only imagine the new fancy Nichicon UKA caps might be opening up the top end too much? Is this the reason it's a little tinny?
I did not bias the big transistor with a scope, I just did it the sloppy way. I turned the screw thingy until the case of transistor measured 22.66 Volts.
Could it be this (bias without the scope) that makes it sound a little tinny?
Any suggestions guys?
A few months back I completed my EZ1290 build. However, I did not go completely by Martin A's build guide. I designed my own simple linear power supply using an LT317 voltage regulator. It worked great. I also decided to replace all the Vishay electrolytic caps with the fancy Nichicon UKA "audio grade" caps. Other than that, all the components are exactly like everyone else's EZ1290. Also, I went with the MPSA18 transistors.
The preamp has amazing dynamic range, it has tones of headroom, and no grounding problems. However, it sounds a little bit "tinny". I can't say it's all the way "tinny" cause there is midrange and bass, but it's edging towards "tinny-ness". I can only imagine the new fancy Nichicon UKA caps might be opening up the top end too much? Is this the reason it's a little tinny?
I did not bias the big transistor with a scope, I just did it the sloppy way. I turned the screw thingy until the case of transistor measured 22.66 Volts.
Could it be this (bias without the scope) that makes it sound a little tinny?
Any suggestions guys?