I am building a 2A3 direct coupled SET, something along the lines of an Asano or Morrison Micro 3.5
I though I would PSUD the Micro 3.5 supply to use it as a benchmark to compare my hardware to.
The micro consists of a 10u 10HY 54u CLC, which yields around 400 VDC with a 5V4-G and 750V center tapped transformer. I think the choke used would be around 150ohms.
This configuration shows around 180mV of ripple. It has a fairly quick rise time of 0.106 seconds, comparatively speaking to some of my models before.
Now comes my model which has 50u 30HY 50u 440ohm chokes (monoblocs), using a 5V4-G and a 750V center tapped transformer. This gets me around 6mV of ripple. It is however slower then the micro mentioned above, stabilizing around .333 seconds.
Now I have 2 separate choke units which have the option of 1x30HY @ 440ohms or 2x7.5HY @ 220 ohms each.
The third option with 2x7.5HY chokes per power supply stabilizes around 0.700 seconds but is has 0mV ripple, flat lining at 419V.
I can also just use one 7.5HY per PT, but that is slow and ripply compared to the above options.
Is the 180 mV ripple with the fastest rise time "better sounding" then my comparatively slower but smoother or "perfect" B+ options.?
By better sounding I mean noticeably better recovery from transients.
I though I would PSUD the Micro 3.5 supply to use it as a benchmark to compare my hardware to.
The micro consists of a 10u 10HY 54u CLC, which yields around 400 VDC with a 5V4-G and 750V center tapped transformer. I think the choke used would be around 150ohms.
This configuration shows around 180mV of ripple. It has a fairly quick rise time of 0.106 seconds, comparatively speaking to some of my models before.
Now comes my model which has 50u 30HY 50u 440ohm chokes (monoblocs), using a 5V4-G and a 750V center tapped transformer. This gets me around 6mV of ripple. It is however slower then the micro mentioned above, stabilizing around .333 seconds.
Now I have 2 separate choke units which have the option of 1x30HY @ 440ohms or 2x7.5HY @ 220 ohms each.
The third option with 2x7.5HY chokes per power supply stabilizes around 0.700 seconds but is has 0mV ripple, flat lining at 419V.
I can also just use one 7.5HY per PT, but that is slow and ripply compared to the above options.
Is the 180 mV ripple with the fastest rise time "better sounding" then my comparatively slower but smoother or "perfect" B+ options.?
By better sounding I mean noticeably better recovery from transients.
Last edited:
Low output impedance of the PSU at all audio frequencies is probably of importance to how it sounds.
That is mostly controlled by the last C of the PSU, combined with any on board decoupling capacitance.
That is mostly controlled by the last C of the PSU, combined with any on board decoupling capacitance.
OK, thanks Andrew.
I forgot to mention that my speakers are 92db efficient so I will go the low impedance route for now.
I will eventually get some more efficient speakers, if I find hum is a problem I can hopefully deal with it then.
Cheers.
I forgot to mention that my speakers are 92db efficient so I will go the low impedance route for now.
I will eventually get some more efficient speakers, if I find hum is a problem I can hopefully deal with it then.
Cheers.
- Status
- Not open for further replies.