Hi
I have a BuffaloDAC. I build the Lampizator Voltage output stage (6H8c tube) for the DAC. Unfortunately it does NOT work as it is shown on the Lampizator website.
I have attached 2 pictures. The 1st pic shows what i build (link to Lampizator Buffalo mod). Problem is that the 2 coupling caps does not see the same impedance. C1+ sees Rg (330k in my case) and C1- sees Rin + Rk which is 1k+ 820 = 1820ohm. The HP filter of C1- and 1820ohm has a 3db point at around 200Hz. This means that the total output of the circuit has a 5-6 dB attenuation at 20 Hz that slopes up to about 200Hz.
So i'm looking for something else 😎
The second pic is a schematic I have been thinking of building. This is a SRPP Ballanced I-V conversion. Can anyone tell me if this will work? And is R?? (39 ohm) needed as seen in the Right channel of the schematic?
I have a BuffaloDAC. I build the Lampizator Voltage output stage (6H8c tube) for the DAC. Unfortunately it does NOT work as it is shown on the Lampizator website.
I have attached 2 pictures. The 1st pic shows what i build (link to Lampizator Buffalo mod). Problem is that the 2 coupling caps does not see the same impedance. C1+ sees Rg (330k in my case) and C1- sees Rin + Rk which is 1k+ 820 = 1820ohm. The HP filter of C1- and 1820ohm has a 3db point at around 200Hz. This means that the total output of the circuit has a 5-6 dB attenuation at 20 Hz that slopes up to about 200Hz.
So i'm looking for something else 😎
The second pic is a schematic I have been thinking of building. This is a SRPP Ballanced I-V conversion. Can anyone tell me if this will work? And is R?? (39 ohm) needed as seen in the Right channel of the schematic?
Attachments
A Buffalo dac is not going to be made to sound better with a tube I/V. It can be made to sound different though. If you want to try SRPP, you could try two of them, one for each of the differential outputs, then see if you want to differentially sum the SRPP outputs to get SE. Or you could just try using one of the outputs, and forget about differential. Just using SRPP is going to be more distorted than if using opamp I/V since the dac will essentially be operating at least somewhat in voltage mode, so what you get will not exactly be I/V.
The main problem with Buffalo though is its an old design from the early days of ESS dacs. People have learned a lot about how to get better sound out of ESS chips since then.
The main problem with Buffalo though is its an old design from the early days of ESS dacs. People have learned a lot about how to get better sound out of ESS chips since then.