No.
No.
No but surely if used 4P1L will be problems. I made a 4P1L but with OPT loaded as headphone amp and SQ is very very good and without problems, the same when loading the 801A with resistors in place of CCS or Gyrator/Hybrid mu-follower from Ale Moglia aka Bartola combined with SSHV2
Yes but the problem is the active load.
No.
No but surely if used 4P1L will be problems. I made a 4P1L but with OPT loaded as headphone amp and SQ is very very good and without problems, the same when loading the 801A with resistors in place of CCS or Gyrator/Hybrid mu-follower from Ale Moglia aka Bartola combined with SSHV2
Yes but the problem is the active load.
To be clear also problems when loading DHT anode with CCS or Gyrator/Hybrid mu-follower from Ale Moglia aka Bartola combined with SSHV2
It makes some intuitive sense, having two CCS in series makes them fight with each other about who is controlling the current flow.
Probable best to use a cap multiplier-type PS for CCS or gyrator loaded valve.
Probable best to use a cap multiplier-type PS for CCS or gyrator loaded valve.
Well all depends your needs, cascode CCS loaded valve only regulate current and gyrator loaded valve only regulate voltage, take your poison...
Does it though (only reg the voltage)? You cant really separeate I and V control. And you stated that the problem happens with CCS as well.
I am not trying to argue, just trying the understand. 😎 In fact, my use scenario was to power CCS-loaded tube stages. So it may not work well.
I am not trying to argue, just trying the understand. 😎 In fact, my use scenario was to power CCS-loaded tube stages. So it may not work well.
So the problem is only happening with DHT on a CCS or gyrator load?
I am trying to power a CCS loaded high gain triode.
I am trying to power a CCS loaded high gain triode.
I use old Black Gates at PSU so I tested the old BG and are OK but I will try with fresh Nichicon, it's the later thing to check.
The problem was the old BG, finally used 40uF 440VAC ASC 386S polypropilene in oil no inductive & 820uF 550V Kemet ALS60A821KF550, PSU LCRC.
Well changed at SSHV2 the two cascode CCS Q1 & Q2 for IXTP08N50D2 and Q3 SIHP8N50-D-G3 for TSM60NE145CIT COG, also made a couple of cascode CCS as load with IXTP08N50D2.
SSHV2 sett to 60mA because each cascode CCS set to 20mA, difference between Vin & Vout 20V.
All is working and measuring OK but the SQ is very bad compared vs a resistor as load, sounds very thin without bass & mids, so still something not good to use SSHV2 together cascode CCS with DHT with filament bias resistor.
SSHV2 sett to 60mA because each cascode CCS set to 20mA, difference between Vin & Vout 20V.
All is working and measuring OK but the SQ is very bad compared vs a resistor as load, sounds very thin without bass & mids, so still something not good to use SSHV2 together cascode CCS with DHT with filament bias resistor.
Nice that it electrically works with all those different semiconductor types. Especially Q3 being a fully plastic encapsulated type is good for safety.
But it seems like the subjective comparison is mainly between resistor load or active load in the audio circuit itself.
Active load makes a flat load line, also gain goes full to μ. Changes it all.
I didn't like active anode load in my 6V6 line pre design as well. Sounded thin. And it even was with a Maida PSU fitted when I tried that out. So I think its not mainly about a specific PSU design interaction.
Maybe try other current bias levels for the audio tube active anode load looking for a subjectively sweeter spot.
But it seems like the subjective comparison is mainly between resistor load or active load in the audio circuit itself.
Active load makes a flat load line, also gain goes full to μ. Changes it all.
I didn't like active anode load in my 6V6 line pre design as well. Sounded thin. And it even was with a Maida PSU fitted when I tried that out. So I think its not mainly about a specific PSU design interaction.
Maybe try other current bias levels for the audio tube active anode load looking for a subjectively sweeter spot.
Constant current can be demanding on some tubes, even making them bit noisy. Try half the mA of your now active bias to see where it goes subjectively?
Of course sounds better with less mA, tried with 10 & 15mA.
Mine problem is that I want the Bias +-234V & +-20mA but tubes can't reach because are asking 260V or more to set the 20mA.
Mine problem is that I want the Bias +-234V & +-20mA but tubes can't reach because are asking 260V or more to set the 20mA.