Im cobbling up a universal tube preamp with the maida regulator. Calling it universal for the fact that the gain stage will be modular and differenr circuits can be tried on a single board. But as such the psu will have to be fixed in its voltage range. So id like to ask you what b+ voltage should i aim for that will make the pre as 'unuversal' as possible? 😁
Why do you want to fix the B+? I would think you'd want to set the B+ as best for each different circuit.
A T-reg would be ideally for that, settable from 0 to 500V with a single pot.
Jan
A T-reg would be ideally for that, settable from 0 to 500V with a single pot.
Jan
Thanka jan that looka nice
I kinda wanna stick to maida tho because of its simplicity since this is my firat hv project and maida has adhust range of only +-15% from what ive read
I kinda wanna stick to maida tho because of its simplicity since this is my firat hv project and maida has adhust range of only +-15% from what ive read
Тhat maida thingie can easily become the bottleneck in your investigations. Shunts rule if you like regulated sound, but do you?
As for voltage, there is no such thing as a universal B+ to aim for. 100v - 400v depending on preferred tubes and topologies. Perhaps even lower.
As for voltage, there is no such thing as a universal B+ to aim for. 100v - 400v depending on preferred tubes and topologies. Perhaps even lower.
That would be ideal but my goal at the moment is effective and safe. And for that Lm317's built in safety features are undeniable
But isn't part of the whole exercise to find out which circuit is best/sounds best? And isn't the B+ an important parameter for that?
Seems to me that if you test various circuits but do not adapt the B+ for it, the results of your test are questionable, because you never know how good each circuit would be with optimal B+.
Even if you use a Maida, setting the output voltage is straight-forward - it even tells you how on the schematic.
Lower R4 and increase RV1 and you can set any output range you like. This DIYAUDIO!
Jan
Seems to me that if you test various circuits but do not adapt the B+ for it, the results of your test are questionable, because you never know how good each circuit would be with optimal B+.
Even if you use a Maida, setting the output voltage is straight-forward - it even tells you how on the schematic.
Lower R4 and increase RV1 and you can set any output range you like. This DIYAUDIO!
Jan
Well another big reason is that I might end up running a group buy here in korea for these preamps. I cant expect the average user to safely tweak the high voltage of these machines so i have to assume that the B+ is fixed then work backwards from that. Plus without the tweaking you gain a big functionality benefit because now the modules can be swapped on the fly.
Ill have to look more into the maida circuit tho, thank you.
Ill have to look more into the maida circuit tho, thank you.