There is only one. I was wondering if I need separate winding for rectifier? I use all filaments from this only one.
Your preamp has a rolloff frequency of about 210KHz, with a small grid stopper you wouldn't lower it too much, so if the valve don't oscillates, no need for a grid stopper.
I think your RF problem is due to another cause, try two small ceramic capacitors, say 10nF from input ground RCA sockets to chassis.
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Mostly because i'm gonna change to to 6X5-GT soon. I did some sim a month ago (but didn't fully understand it then) and i couln't see a big diffrence between them. What I've heard the 6X5GT is a octal version of 6X4
Turn off your cell phone and measure with a scope.
Edit: Why don't try to solve the problems you have with this design first?
Here we say that we should not change horses in mid-river. 🙄
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Hi,
That's correct. But why change to the 6X5 then?
I'm aware there are sonic differences between rectifiers but these two should sound the same.
That said, in a properly designed PS the sonic impact should by all means be minimal at least.
Ciao, 😉
That's correct. But why change to the 6X5 then?
I'm aware there are sonic differences between rectifiers but these two should sound the same.
That said, in a properly designed PS the sonic impact should by all means be minimal at least.
Ciao, 😉
-I don't have a scope...
- As i see it now, PT is a small problem. It sounds very good. Hum/noise is good (but can be better) Yes, cellphone sometimes but i can live with it i think.. Can only listen about 2-3h per day anyway) And I want to try above PSU before i settle. Transformer have to go on the outside in a metal cover, cuz with all caps there is no more space left inside the case anymore.
Then i tear it down and built it up again a bit more "professional".
-I just want all Resistors where they should be, right values and so on and wanna feel this is it. Then i can tear it down. Maybe I did'nt make myself clear. I just don't want to start to rebuild everything once it's up running again.
Hope you understood me.
/J
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Mostly cos i got a russian 6u5c first and had an nice goldplated octalsocket in my stash =) The Swedish seller sent me this russian 6X4-R for free for direct replacement with the chinese 6z4 when i ordered 6u5c. (I know him well)
Understand now? 😀 I'm terribly at explaining things
EDIT: ONE OTHER THING, BIG (BIGGER) RECTIFIERS ARE SEXY =) hahaha
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I know how it feels, thanks to my cousin now have an old oscilloscope.
If your preamp sound as good as you did say, I don't think you have any problem with oscillations.
Your previous C-L-C-R-C-R-C PSU, not my way, but did look very good.
Be in mind that overdesign isn't always good, and more often distortion lowers with an increase of +B.
OK, understood. 🙂
Maybe stupid questions
but if i have b+ voltage of say 300V and in the psu there is one cap rated 250VDC and one 160VDC, are they sharing the load so each seeing 150V or? If they're are paralelled without any res between them? Atleast this is what i've been believing for 20yrs but suddenly i got little unsure...
Also if a transformer have a current rating of say 1,5A, that is max what i can give out? Not what is giving all the time? So if my tubes pull out 350x2mA i have more juice left?
Thx if you can clear this up.
I'm about to test res bypassed cathode res suggested by our Belgian friend and mr Carl from u.s (earlier in the thread)
Let see what i think=)
but if i have b+ voltage of say 300V and in the psu there is one cap rated 250VDC and one 160VDC, are they sharing the load so each seeing 150V or? If they're are paralelled without any res between them? Atleast this is what i've been believing for 20yrs but suddenly i got little unsure...
Also if a transformer have a current rating of say 1,5A, that is max what i can give out? Not what is giving all the time? So if my tubes pull out 350x2mA i have more juice left?
Thx if you can clear this up.
I'm about to test res bypassed cathode res suggested by our Belgian friend and mr Carl from u.s (earlier in the thread)
Let see what i think=)
Maybe i like this "tweak" or I actually do.
Piano seems to come out better, better see-through... bigger soundstage, much wider. Quieter between pauses. No so much "in your face", more laidback.
Only on well recorded songs i hear this..
If it only gets better why not go MKP all the way..
What do the experts here think about this tweak themselves? Am I on the right track?
Piano seems to come out better, better see-through... bigger soundstage, much wider. Quieter between pauses. No so much "in your face", more laidback.
Only on well recorded songs i hear this..
If it only gets better why not go MKP all the way..
What do the experts here think about this tweak themselves? Am I on the right track?
Capacitors in series share voltage, provided equalisation resistors are used (or leakage current performs the same role - electrolytics only). Capacitors in parallel (which I think is what you describe) each get the full voltage.
Transformer secondary current ratings are continuous RMS AC current. The maximum DC current you can draw from a rectified PSU depends on whether cap input or choke input, and what the duty cycle is.
At one extreme you have a cap-input DC heater supply, or for a preamp or Class A power amp: 100% duty and cap input means you get perhaps 40-50% of the AC rating?
At the other extreme you have a choke input supply for a Class B power amp: say 30% duty cycle and choke input means you could go to 200% on rare peaks.
Transformer secondary current ratings are continuous RMS AC current. The maximum DC current you can draw from a rectified PSU depends on whether cap input or choke input, and what the duty cycle is.
At one extreme you have a cap-input DC heater supply, or for a preamp or Class A power amp: 100% duty and cap input means you get perhaps 40-50% of the AC rating?
At the other extreme you have a choke input supply for a Class B power amp: say 30% duty cycle and choke input means you could go to 200% on rare peaks.
The first time you blow an electrolytic cap due to too much voltage will also be the last time you let that happen.
WHAT A MESS...........
LOL
LOL
An externally hosted image should be here but it was not working when we last tested it.
Holy crapper
I was just thinking all the MKPs i have in my PSU now is rated 250VDC.... and B+ is 265V. the Elcos is 400V
I had one bulging elko (jamicon LS) that i picked with a knife in the top and it was shaking a shampagnebottle =) =) =)
I really thought it was like with resistors for an example that two 5W paralell can take total 10W.
What the heck should i do?????
I was just thinking all the MKPs i have in my PSU now is rated 250VDC.... and B+ is 265V. the Elcos is 400V
I had one bulging elko (jamicon LS) that i picked with a knife in the top and it was shaking a shampagnebottle =) =) =)
I really thought it was like with resistors for an example that two 5W paralell can take total 10W.
What the heck should i do?????
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Read a good book on electronics?
Don't use your DIY equipment again until you have carefully checked that it is safe?
Don't use your DIY equipment again until you have carefully checked that it is safe?
That jamicon was from an old amp, not recently.
Yes, i would if i had more time... And also a bit hard for me to read and concentrate that's why it's no use of me doing that much cuz when i'm through first page i can just start all over again. Thank God you guys over here don't have that problem. We also call it a form of ADHD here in Scandinavia.
All your replies i have to read atleast 3-4 times before I "know" or feel that i got it. So it's sometimes very tough. A book with many pics is much easier. Like a Hifi magazine.
It's working just fine (right now) 😉 I mean been listening many hours without a hickup.
Yes, i would if i had more time... And also a bit hard for me to read and concentrate that's why it's no use of me doing that much cuz when i'm through first page i can just start all over again. Thank God you guys over here don't have that problem. We also call it a form of ADHD here in Scandinavia.
All your replies i have to read atleast 3-4 times before I "know" or feel that i got it. So it's sometimes very tough. A book with many pics is much easier. Like a Hifi magazine.
It's working just fine (right now) 😉 I mean been listening many hours without a hickup.
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But i think i solder back the gridstopper..something got nervous without it....it's like it's "to bright" or sharp. Or i just like Kiwames to much... 🙂
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Only 3-4 times? I often have to read things more than that to grasp them. Pics don't help when the actual need is sums.Max Martin said:
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