Only to be sure:
ksa1381 are at the gate?
LED the negatives side?
Could be good to stick the schematic with voltages differences in the 1st post.
ksa1381 are at the gate?
LED the negatives side?
Could be good to stick the schematic with voltages differences in the 1st post.
Voltages noted behind the KSA's are at their bases. Led noted voltage at its cathode.
After the inter-voltage differences are cross referenced with yours and agreeing I may link it from post one, or add it to the SSHV2 introduction linked post.
After the inter-voltage differences are cross referenced with yours and agreeing I may link it from post one, or add it to the SSHV2 introduction linked post.
Sorry for delay, attached measurement of voltages. Q1 is Ixys IXTU01N100D in place of DN2540.
Attachments
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How come and there is less voltage on the CCS MOSFETS than on the output? Despite some absolute differences it follows the rest of trends. I would also expect little more voltage difference between Q1 Q2 source pins but its the IXYS in this case. Maybe IXYS Q1 with IXYS Q2 can work better and sound better in this build?
I replaced Q1 because I burned several DN2540 in this position, IXYS is more robust.
If you have time please take a look here: https://www.diyaudio.com/forums/tubes-valves/363199-salas-sshv2-moglia-hybrid-mu-follower.html#post6416281
If you have time please take a look here: https://www.diyaudio.com/forums/tubes-valves/363199-salas-sshv2-moglia-hybrid-mu-follower.html#post6416281
Took a look and I am thinking something is electronically wrong so it naturally manifests in disappointing sound. This lower voltage level on Q1 Q2 source pins than the on the reg's output thing is very fishy.
This looks more logical for difference between Q1 Q2 but 181.5V output >181.1 source Q2 is still weird. There should be difference due to drop on R3//R4 + R5 keeping Q2 source higher than Vout. Can there be oscillation on output so its AC+DC average?
Salas 5687 has too much gain, I like DHT but is a lot of money in txs, 5687 sound is very good, some ideas: how about 6V6 as analog output stage for the noDac?