Hi Valery,idle is already 31mA/piece=62mA/pair.😉
I have something interesting too.
Another test using a real speaker as load.
Last edited:
AX-Deluxe FFT Test.
Using a real 3way speaker as load.
Using a real 3way speaker as load.
Attachments
Last edited:
Are there TubSuMo IPS PCB's readily available, either in through-hole or in SMD version?
Best regards!
Best regards!
I still have three of the original TubSuMo input boards left, plus a bunch of the output boards. I have some of the SMT version for the NS series output boards, but would like to test one to verify operation before making them available.
Emmm... in the complementary pair, transistors (as well as emitter resistors) are connected in series. Meaning that the voltage drop across those resistors sums up, but the current stays the same.
So, you need to have 14mV across each 0.22R resistor, or 28mV across 2 resistors in series 😉
AX-Deluxe+NS
17mV/0.22R
On a real speaker.
17mV/0.22R
On a real speaker.
Attachments
Last edited:
Harmonics 2 and 3 with dominant 3, but rather low absolute values and rather clean high-order areas. I like the way it looks. The amp is also rather tolerant of bias variations - previous measurements with less than 50% bias setting are still good enough 😎
Did you audition the thing?
It will be interesting what TubSuMo front-end is going to show under the same conditions.
Did you audition the thing?
It will be interesting what TubSuMo front-end is going to show under the same conditions.
Distortion numbers look better with a speaker attached. I though it would be the other way around.
My build is coming along nicely. That is the NS OPS with Vertical CFA IPS
Here's the regulator PCB
Here's the Vertical CFA
I'm pretty happy so far. I'm also working on another project at the same time but it is a headphone amp.
Ciao!
Do
Here's the regulator PCB
Here's the Vertical CFA
I'm pretty happy so far. I'm also working on another project at the same time but it is a headphone amp.
Ciao!
Do
Just for a little but not on main speakers(i haven't protection board yet).
I think that is a nice sounding IPS.
When i will have the TubSumo on hand we will know the difference.
That's why we run the test!
Real world is different than simulations.😉
AX-Deluxe using MAT02
Today tried the MAT02 as input pair but without success.
I see a big distortion level at low volume due to oscillation?
hfe=860,probably the input stage current is realy big and must be lowered?
Today tried the MAT02 as input pair but without success.
I see a big distortion level at low volume due to oscillation?
hfe=860,probably the input stage current is realy big and must be lowered?
or increase the input emitter degeneration,
or do both, i.e. increase degen and reduce Ic.
Hi Thimios,
Are you sure the pinout is correct (I mean, the CBE leads are connected as expected)?
Input stage current is around 1.3mA per collector and it does not depend on hFE of the pair.
By the way, hFE of 2N5089 you used initially is normally around 1000.
So, my guess is the wrong pinout 🙂
Cheers,
Valery
Are you sure the pinout is correct (I mean, the CBE leads are connected as expected)?
Input stage current is around 1.3mA per collector and it does not depend on hFE of the pair.
By the way, hFE of 2N5089 you used initially is normally around 1000.
So, my guess is the wrong pinout 🙂
Cheers,
Valery
Because i haven't any 2N5089 i used 2N5088 in my board.
Yes i'm sure for pinout,pins c,e reverced in one side.
Last edited: