Now I'm listening with Ale Moglia aka Bartola hybrid mu-follower/gyrator without SSHV2 and also the SQ is very very high.
When used the SSHV2 with the hybrid mu-follower/gyrator the sound isn't so good like without the SSHV2.
So something not good with active loads + SSHV2 + DHT
When used the SSHV2 with the hybrid mu-follower/gyrator the sound isn't so good like without the SSHV2.
So something not good with active loads + SSHV2 + DHT
Last edited:
REPORT:
Just finished testing my SSHV2 after weeks and weeks of hiatus. Used a large 5k load brought up the voltage slowly with variac. Rightaway I managed to make a small sacrifice to the 'magic smoke gods' by blowing a .1A primary fuse at 60VAC primary. Put in a 1A fuse and continued on.
I made a note how SSHV2 responded, went to .8v at the TP with the first trimmer, then bringing the voltage up with the second trimmer lowers the TP voltage. So I continued up with the variac playing this game to full 120V mains and ended up with 200V output 0.8-0.85V @TP and 260V input voltage to the reg. The input voltage settled quite a bit down with the regulator in the circuit. The CRCRC with the same 5k load gives 280V so it seems there is a 20V insertion loss due to load from the reg. Let the resistor warm up 15 min everything checks out and turned it off. The turn off worked fine, the voltage got lowered monotonically.
To do:
-power up with full voltage.
-I have to repeat the procedure with a lower res load. The 5k at 200V means 40mA, my tube circuit will be a 60mA load of 3.3k res load equivalent, which I don't have. I am guessing increasing the load will probably bring the input voltage to the reg down even more, probably another 10V or so bringing me in recommended drop range.
Just finished testing my SSHV2 after weeks and weeks of hiatus. Used a large 5k load brought up the voltage slowly with variac. Rightaway I managed to make a small sacrifice to the 'magic smoke gods' by blowing a .1A primary fuse at 60VAC primary. Put in a 1A fuse and continued on.
I made a note how SSHV2 responded, went to .8v at the TP with the first trimmer, then bringing the voltage up with the second trimmer lowers the TP voltage. So I continued up with the variac playing this game to full 120V mains and ended up with 200V output 0.8-0.85V @TP and 260V input voltage to the reg. The input voltage settled quite a bit down with the regulator in the circuit. The CRCRC with the same 5k load gives 280V so it seems there is a 20V insertion loss due to load from the reg. Let the resistor warm up 15 min everything checks out and turned it off. The turn off worked fine, the voltage got lowered monotonically.
To do:
-power up with full voltage.
-I have to repeat the procedure with a lower res load. The 5k at 200V means 40mA, my tube circuit will be a 60mA load of 3.3k res load equivalent, which I don't have. I am guessing increasing the load will probably bring the input voltage to the reg down even more, probably another 10V or so bringing me in recommended drop range.
Matter of Q1 VDS spec, C1, C2 rating and R9, R10 sizing typically. But it may arc due to pcb or be prone to burning out easier.
It is running stably with the 5k load for an hour or so. I did notice that the voltage starts out on the low side, like 193V and goes up to 200V in a few mins when things warm up.
Merlin,
what you bought a few different mosfets, which one did you install in the end?
Merlin,
what you bought a few different mosfets, which one did you install in the end?
If Q1 is IXTP 01N100D VDS 1000V is ok?
About capacitors is that support voltage rating like 630V not related to capacitances right?
About resistors i sizing power not resistance ok?
Q1 1000V ok
DC Voltage rating of the caps higher than before, yes
About resistors R9 R10 sizing should be higher in both ways. Power rating better be 3W each and value no less than 90k-100k each
Its not a fixed max. Pk to Pk ripple input should not be allowed to reach the Vin - Vout figure within a safe distance. For Vgs and AC mains fluctuation to have space. Say you got 320V in and 300V out. Don't allow more than 10V Pk Pk ripple input. If you had 340V in and 300V out you could allow 20V Pk Pk ripple. Pk Pk is AC RMS * 2.83 if its a sine ripple.
If difference Vin-Vout 20V max. allowed 10Vpp = 3,53Vrms
If difference Vin-Vout 40V max. allowed 20Vpp = 7,07Vrms
Right Salas?
If difference Vin-Vout 40V max. allowed 20Vpp = 7,07Vrms
Right Salas?