put two of them , no harm 
yup - on wire , right to socket pin ( not practical to open da tube and put them inside )
yup - on wire , right to socket pin ( not practical to open da tube and put them inside )
you can blame only your self for that ........ matter of physical layout ;
if you proceed in that direction , you must place some local decoupling near tubes ; say that anything more than 10cm of wires between shunt reg and tubes is critical , in my book ;
how you'll do with high S toob ? you would have fireworks
My first thought was to use an umbilical from SSHVs to tubes as I have seen many people do here on 26 amps for example but I changed that idea in the middle of my test build when I saw Andrew T post something about that. So I putted the SSHVs just under the toobz instead. Those connects with 11-12 cm ethernet twisted pairs now.
All this info needs a burger to melt together with. Hotdogstand, here I come.
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As far as I understand the SSHVs are just passing the ground thru, thats why I made it like this. Theres one PSU and two SSHVs with separately connecting audio grounds
FWIW. I had trouble with tube rectifier and noise, but i don't know **** about tubes or anything else, for that matter. MY SS bridge was dead quiet.
. MY SS bridge was dead quiet.
Salas will know what to answer , even if I'm not doubting his layout
thought - more pics of your harness will not harm
thought - more pics of your harness will not harm
Heres some. Beware its a dummydoll, no comments of that please😀
First is PSU doll, second shows how I place the audio circuit on that, third trafo/filter side, 4th PSU star ground, 5th SSHVs, and 6th the audio circuit again.
I will do things in steps, starting I think with filament css to audio gnd point. Tho I know now that I made a mistake on that. Two LM317 is sharing same PSU. That means there could be the loop.
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Nobody does that. The regulator is placed as close as possible to the load. The umbilical cable is to bring power to the regulator.
Loud hum must be a ground loop.
I don't see the cathode chokes in the last picture. Those chokes if they're anywhere near the psu they'll pick a ton of 50Hz hum.
If I'm to build a dualmono LM317 filament CSS to be able to truly separate their grounds, how cruical is the input voltage from trafo? Salas has dual 10 VAC secondarys and I cant find any. Single 9 volters and single and dual 12 volters is what I find now.
9V will do
provide fine tuning for current , to get 6V3 ; each toob needing readjust ; final check of voltage after 5min or so and it will stay like that for years
provide fine tuning for current , to get 6V3 ; each toob needing readjust ; final check of voltage after 5min or so and it will stay like that for years
what ground separation ?
there is no gnd separation needed for heating indirected heated toobz
there is no gnd separation needed for heating indirected heated toobz
If I am to try and connect the filament ground reference to the 2 audio ground stars instead of the single PSU ground star I need 2 separate grounds. Last time I connected the filament-CSS it had one common ground that was connected to single PSU ground. The dual LM317 had one common PSU/ground.
Or maybe I could just connect CSS PSU ground to big PSU ground and connect filament zero to each audio ground
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choose one "side" of HV PSU , after or prior to reg , make explained voltage divider on it
it's irrelevant which one
potential is potential , no need to do same thing twice
it's irrelevant which one
potential is potential , no need to do same thing twice
Ok. Im on chokes now. Didnt find any suitable shilding so im trying with twisting kathodechoke wires instead.
I've never messed with ferrite beads. I guess there must be isolation between them and the wire?
I had B+ voltage divider when I tried ac to filaments, even an adjustable one between 5-95 volts over gnd. Didnt make much of a difference, but it might do to css fed dc.
I've never messed with ferrite beads. I guess there must be isolation between them and the wire?
I had B+ voltage divider when I tried ac to filaments, even an adjustable one between 5-95 volts over gnd. Didnt make much of a difference, but it might do to css fed dc.
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Cathodestoppers on chokewires in the form of dual ferrite beads mounted on both channels. Now to some professor balthasar walking around thinking of CSS circuit and potential divider.
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Correct. They just pass the ground doing no further tricks. You can even star ground them. When picturing them in a system think of the force 0 line carrying the PSU ground path to the load. Don't loop that twice at the load.