Yes of course. But I would put same values (20k) on both rails to see if its the tubes that differ.
One takes 4,6 and the other 6,4 now, and thats a big percentual difference with almost the same B+
If you have 20 k on both filterlanes, the measurements will be more accurate over that then over the 100R, when changing tubes
Now concentrate on the fresh tube. Let the other one sit but measure on the fresh. What your up to now is to decide how to drop the 90 volts. A resistor gives the feeding an unnessesary high impedance. You should consider a shunt. It drops without adding impedance. VR tubes were suggested. SSHV2 also drops that easy at those currents (in fact im not sure how well it behaves under 10 mA, ask Salas or other guys that has used it here. Glow tubes are nice. 85+85 gives 190 Volts and 40 for SSHV2.
Tho, if using SSHV2, check first with your livee circuit. Use a dummy load for 25 mA/channel. Easy to forget that SSHV eats current that lowers original voltage, and you might end up to low.
Tho, if using SSHV2, check first with your livee circuit. Use a dummy load for 25 mA/channel. Easy to forget that SSHV eats current that lowers original voltage, and you might end up to low.
Same tube now measures 0,490V across 100R, I adjusted the tube at the socket it seems don't do good contact
your home
Salas advice is set the SSHV2 to 30mA, 20mA consums the reg itself at the other 10mA for the 26.
You just measured it. It's the voltage across the 100R resistor, divided by 100.
In my opinion it would be easier for you to use a VR150 tube with a DN2540 CCS, than the Salas shunt reg. Normally I would recommend the shunt reg, but look what troubles you already had with this circuit.
In my opinion it would be easier for you to use a VR150 tube with a DN2540 CCS, than the Salas shunt reg. Normally I would recommend the shunt reg, but look what troubles you already had with this circuit.
Thanks Iko
left channel 6,6mA
right channel 4,9mA
So if I will use SSHV2 I have to adjust for 31,5mA🙂, is a pleasure to learn.
left channel 6,6mA
right channel 4,9mA
So if I will use SSHV2 I have to adjust for 31,5mA🙂, is a pleasure to learn.
I'd say first measure the ripple wtth the scope before the 15/20k resistors, because that is what the shunt/CSS/gyrator whatever has to deal with. You know the current🙂 Then ask the big guys, not me. I'm not your man on that😉
I have two SSHV2 working without any problem: one in Valve Itch and another a ECC81 mu follower lineamp
For 26 due to the fact I bought a small chassis by my mistake I want try other kind of reg like your CCS+gyrator, I ask again: can I use it togheter the OPT or you believe better to avoid and go for SSHV2 or VR150 tube with DN2450?
TIA
N.B. Don't worry Iko, troubles is my way to learn.
SSHV2 goes well with OPT, 99% certain but you can never know. If you have problems theres always master Salas. I dont know about the gyrator. CSS+shunt or shunt+CSS, thats what SSHV is.
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Or VR150 + DN2450 as Iko suggested and if I don't want to change the chassis I only have two alternatives:
VR150 + DN2450
CCS + Gyrator
VR150 + DN2450
CCS + Gyrator
Either use Salas' shunt, or use a VR150 tube. Forget the gyrator, that's TO REPLACE the output transformer, which you want to keep.
VR150 + DN2450 would be my cup of tea, depending on my level of noice kill. with higher ripple SSHV2. There you have an out of the box well singing solution. Shunt + CSS is for learning, expect some trouble😉
So only one winner VR150, where can buy cheap? any prefered manufacturer and ebay trust seller?