The (theoretically) maximum output swing is V(B+) peek to peek, so output capacitor voltage range must exceed this value (about 1.5 multiplier).
So if you have 220V as B+, 400V capacitor is enough.
If you have 400V, 630V cap required.
Thankyou.
Just for example, if I have 400V B+, can I use 400V main cap, and by pass it with a 1600V small cap ??
Just for example, if I have 400V B+, can I use 400V main cap, and by pass it with a 1600V small cap ??
Slightly off topic guys, without having to take Az1 route, whats a
nice sounding rectifier that you would recommend ?
Thks
nice sounding rectifier that you would recommend ?
Thks
I tried the 80, but went back to the meshplate AZ1. In my set up it was a distinct improvement.
Isn't the 80 over rated for this application ?
May I ask how does the AZ 1 sound like
& must it be only mesh plate
Thks guys
May I ask how does the AZ 1 sound like
& must it be only mesh plate
Thks guys
AZ 1 mesh sounds more open and natural. Yes, it has to be mesh for best sound.
I'll guess those electrons just loves that vacuum that's sipping trough the mesh everywhere 😛
I'll guess those electrons just loves that vacuum that's sipping trough the mesh everywhere 😛
Now that's an ouch for me . It's getting very expensive
the AZ1 especially the mesh plates. Isn't there any other
varieties that sound just as open ?
Thks
the AZ1 especially the mesh plates. Isn't there any other
varieties that sound just as open ?
Thks
I added an octal socket to my PSU, so I could quickly compare the AZ1 meshplate with Mullard AZ31s, supposedly the same as an ST AZ1 but with an octal base. The AZ1 meshplate sounded distinctly smoother and more refined, just the way it had against an ST AZ1. I use the AZ31 or ST AZ1 for testing now, rather than risk the meshplate!
This is the PSU chassis before I changed the second socket from UX4 to octal.
This is the PSU chassis before I changed the second socket from UX4 to octal.
It's more to sound and musicality than rectifiers. I'm using the 5y3g in my 26 preamp and it sounds just fine. Just build the amp with some flexibility (such as a removable board for the rectifier and some space for a couple of big wirewound resistors), and then you know you can add some expensive mesh'es later on. Anyway, the AZ1 is hardly the last word in mesh rectifiers. There are even better and more expensive ones out there.
By the way - Happy Easter fellow 26 and 01A preamp constructors!
I'm playing with the AZ31 now, and it's lively, but "splashy", if that makes any sense! Some people might prefer it, as some prefer pop over classical (for example, not a judgmental opinion), but not so much to my taste. Still, I'll leave it in for a bit and see if I appreciate it more when I'm sober! 😀
I love valves, the way I can mess around with the sound. I just wish I was a bit cleverer and understood them more. 🙁
Well looks like I've no choice & I hate splashiness. lol
Think I read somewhere that the 6x series rectifiers
sounds good but can't recall
Thanks again guys
Think I read somewhere that the 6x series rectifiers
sounds good but can't recall
Thanks again guys
I'm in the prosess of finishing up my 2 chassis 26 preamp. Is it ok to use only one connector for the HT and filament wiring? Do I need some kind of separate screening of the wiring inside the umbilical?
Assuming that the Filament Regulator is near to the valve-socket, and all of the Raw DC caps are in the power-chassis,
AND
The B+ supply capacitors and chokes are in the Power chassis (a small cap in the signal chassis is OK).....
If you build it like this, the 'umbilical cable' should have only static dc voltages, and steady dc current.
Like this, running the B+ and filament raw dc in the cable is OK.
But if there is any pulsing-current in the cable, caused by capacitors in the signal-chassis - there will be some noise-coupling.
AND
The B+ supply capacitors and chokes are in the Power chassis (a small cap in the signal chassis is OK).....
If you build it like this, the 'umbilical cable' should have only static dc voltages, and steady dc current.
Like this, running the B+ and filament raw dc in the cable is OK.
But if there is any pulsing-current in the cable, caused by capacitors in the signal-chassis - there will be some noise-coupling.
I do indeed have B+ capacitors and chokes in the signal chassis. Sigh! Ok then, two connectors with separate screening it is. Thank you Rod for responding so quickly.
I use this circuit, with a choke followed by a cap in the signal chassis, with a single screened umbilical, and haven't noticed noise coupling.
Having said that, I do have a hum problem with the 01A, using the same layout, but a gyrator instead of a transformer.
Having said that, I do have a hum problem with the 01A, using the same layout, but a gyrator instead of a transformer.