#1 Thorsten TDA1541A ECC88 output stage
Posted: Tue Feb 14, 2012 12:33 pm
Dear All,
I have been using Thorsten's choke loaded ECC88 stage couple to my TDA1541A DAC chip. The only difference with the attached circuit diagram is that I used single 75 ohm Holco metal film resistors for the I/V.
Thinking that there might be good reason for using Thorstens more complex stage I finally got round to rebuilding the stage as per the attached schematic.
The result was positive with regard to detail and also helping to get the individual instruments and voices to sit better in their own space. However, it is far less relaxing with more than a hint of sibilance.
The 47nf (polystyrene) capacitor is as I understand it to roll-off the response in the ultra-sonic region. The 330nf (metallised polyester) and the inductor I think are to boost the HF response, however I am not sure that I have that right. Resistors used were 0.5W carbon films.
Could someone please help me to better understand the circuit and help me to work out what to try altering first to get the response right in my system.
Many thanks,
Ian
I have been using Thorsten's choke loaded ECC88 stage couple to my TDA1541A DAC chip. The only difference with the attached circuit diagram is that I used single 75 ohm Holco metal film resistors for the I/V.
Thinking that there might be good reason for using Thorstens more complex stage I finally got round to rebuilding the stage as per the attached schematic.
The result was positive with regard to detail and also helping to get the individual instruments and voices to sit better in their own space. However, it is far less relaxing with more than a hint of sibilance.
The 47nf (polystyrene) capacitor is as I understand it to roll-off the response in the ultra-sonic region. The 330nf (metallised polyester) and the inductor I think are to boost the HF response, however I am not sure that I have that right. Resistors used were 0.5W carbon films.
Could someone please help me to better understand the circuit and help me to work out what to try altering first to get the response right in my system.
Many thanks,
Ian