re: pictures
My EL-84 tubes are running with 385 volts and i'll try to get 300 and see how it's going to be. What about the 6p14p is that any difference from EL-84 , as i saw on datasheet they are the same right ?
I see that your tubes are very glow including the pre amp stage.
Tell me about your bias current. I have 14.5V on my cathode.
I didn't have time to check but 7189 has the same pin out ?
Seems to be more appropriated to 400V and also 24W of plate dissipation.
My EL-84 tubes are running with 385 volts and i'll try to get 300 and see how it's going to be. What about the 6p14p is that any difference from EL-84 , as i saw on datasheet they are the same right ?
I see that your tubes are very glow including the pre amp stage.
Tell me about your bias current. I have 14.5V on my cathode.
I didn't have time to check but 7189 has the same pin out ?
Seems to be more appropriated to 400V and also 24W of plate dissipation.
7189 is a good tube, but hard to find and expensive. The 6BQ5 is the American designation, EL84 is European, and 6p14p is Russian. All three tubes have similar, if not identical, specifications. I use the 6p14p because they're inexpensive and seem to work well for me.
I'm not certain of my cathode voltages, but I'm running my idle current around 32 mA. I'd guess my cathode voltages are in the 14 to 16 volt range.
Yes, they do have a nice glow. I took that picture in dim lighting with a long exposure, so the glow of the tubes appears greater than it actually is. There's no red glow on the plates, though. Red glowing plates indicates you are exceeding the dissipation limit of the tube.
I'm not certain of my cathode voltages, but I'm running my idle current around 32 mA. I'd guess my cathode voltages are in the 14 to 16 volt range.
Yes, they do have a nice glow. I took that picture in dim lighting with a long exposure, so the glow of the tubes appears greater than it actually is. There's no red glow on the plates, though. Red glowing plates indicates you are exceeding the dissipation limit of the tube.
Solid State Regulator for tub amp
HI Gang,
I built a push-pull 300b and push-pull gm-70 amplifier driver 6Bx7 with a Shunt Regulator 500v from
http://www.tubecad.com/articles_2001/the_300b_reg/page3.html
What I found with no 417A is the KT88 worked great and sound great.
Regards,
Ashby
HI Gang,
I built a push-pull 300b and push-pull gm-70 amplifier driver 6Bx7 with a Shunt Regulator 500v from
http://www.tubecad.com/articles_2001/the_300b_reg/page3.html
What I found with no 417A is the KT88 worked great and sound great.
Regards,
Ashby
Hi, just following the post, because I am planning my first tube preamp. Also, my first "tube" circuit !..Also, newby in the Diy !
I have an Aikido kit ready to be assembled. And I have already a pcb of a tube power supply regulated from China, the LSDY.
I am not sure about the tube regulation if its accurate through the time. One thing I wish to have is a tube rectifier, because a lot of people on the forums says that it sounds better than a diode rectifier, for a tube preamp (?). Just I dont know, waiting to try and test. But, like everybody I think, looking to buy at least components or circuits close to my requeriments.
I am looking also to see and try the power supply with tube rectifier and mosfet regulation, the TP-3 from diyclub.biz.....If somebody could give me a hando for the direction , it will be very appreciated🙂
I have an Aikido kit ready to be assembled. And I have already a pcb of a tube power supply regulated from China, the LSDY.
I am not sure about the tube regulation if its accurate through the time. One thing I wish to have is a tube rectifier, because a lot of people on the forums says that it sounds better than a diode rectifier, for a tube preamp (?). Just I dont know, waiting to try and test. But, like everybody I think, looking to buy at least components or circuits close to my requeriments.
I am looking also to see and try the power supply with tube rectifier and mosfet regulation, the TP-3 from diyclub.biz.....If somebody could give me a hando for the direction , it will be very appreciated🙂
Re: Voltage Regulator
And the result from your PSU was ... ?
I am curious because I'm also seeking a regulator for my preamp project. 😉
NBBN_amplifiers said:
And the result from your PSU was ... ?
I am curious because I'm also seeking a regulator for my preamp project. 😉
Thanks Gordy
The last two looks like something for me. It would have been good if the text was in english for the next-tube articles. I have also checked variants of this one: The Maida Regulator
I just printed out a transparent film which I will do my own PCB card from tomorrow. I'm also in some testing with just a FET and a zener string. I need about 230V and at least 110mA current for a stereo RIAA and a combined line/headphone amp.
But common for all threads is that no one seems to have an allround, 50-200mA and 200-300 V, working sollution with PCB film available? Everyone is struggling and no one is satisfied
I guess I have to try as well and do my own tests and see if I can come up with a silent PSU. I promise to share when I have done anything to show up.
This forum is the best by the way. 🙂
The last two looks like something for me. It would have been good if the text was in english for the next-tube articles. I have also checked variants of this one: The Maida Regulator
I just printed out a transparent film which I will do my own PCB card from tomorrow. I'm also in some testing with just a FET and a zener string. I need about 230V and at least 110mA current for a stereo RIAA and a combined line/headphone amp.
But common for all threads is that no one seems to have an allround, 50-200mA and 200-300 V, working sollution with PCB film available? Everyone is struggling and no one is satisfied
I guess I have to try as well and do my own tests and see if I can come up with a silent PSU. I promise to share when I have done anything to show up.
This forum is the best by the way. 🙂
Re: Re: Voltage Regulator
It worked out just fine. It's running my Aikido preamp without so much as a hiccup.
I will say, however, that the B+ does regulate a bit high until the tubes are properly heated. The 221k LM317 bias chain, plus the 80k heater reference chain does draw ~5mA, but the sensitivity of the regulator is such that even in this range I end up with ~40V extra B+ until the tubes themselves create a real load.
I'm probably not done playing with this, but all in all it seems to work fine. The PSU requirements for an Aikido line stage are pretty modest.
-k
Radioman62 said:
It worked out just fine. It's running my Aikido preamp without so much as a hiccup.
I will say, however, that the B+ does regulate a bit high until the tubes are properly heated. The 221k LM317 bias chain, plus the 80k heater reference chain does draw ~5mA, but the sensitivity of the regulator is such that even in this range I end up with ~40V extra B+ until the tubes themselves create a real load.
I'm probably not done playing with this, but all in all it seems to work fine. The PSU requirements for an Aikido line stage are pretty modest.
-k
This Aikido stuff is catching up at me .... as well.
I'm into build one also but I want to be able to use it as a headphone amp and then it have to draw some more current.
I would like to use 12B4 triodes at the endstage so I have to do my own PCB. Just to be a bit different and because I have some of them.
Some years ago I did a XPP (also an idea from J. Broskie) with a lot of 12B4 tubes and a diffamp in front. It worked nice at the bench with any load but there was a lot of tubes and capacitors and I read some more ... and some more ... and finally I had to make a decision to build something before I end up in the three coffer 😀. Remembered to be the one speaking about his tubeamps he never built 😀
I mean you can't build "the best" amp because it's different for different people
. On the other hand, the time is not plenty of, and at least you wan't to be able to judge in what direction you could put your effort, without discover afterwards that you did every turn wrong on the way.
I don't want to build 10 tube-amps. About two or three is fine for me
. OK to fine tune afterwards.
My RIIAA stage will be very influensed from John Broskie's articles from 2002, but I will have a bit of my own touch up on it. An Aikido approach will be taken there to. Anyway, if I ever get it to reality I will share it. This forum rules
koolatron:
Good to hear your PSU worked fairly well. I can see it's almost exactly as the "The Maida Regulator", floating around in different shapes and flavours.
I'm into build one also but I want to be able to use it as a headphone amp and then it have to draw some more current.
I would like to use 12B4 triodes at the endstage so I have to do my own PCB. Just to be a bit different and because I have some of them.
Some years ago I did a XPP (also an idea from J. Broskie) with a lot of 12B4 tubes and a diffamp in front. It worked nice at the bench with any load but there was a lot of tubes and capacitors and I read some more ... and some more ... and finally I had to make a decision to build something before I end up in the three coffer 😀. Remembered to be the one speaking about his tubeamps he never built 😀
I mean you can't build "the best" amp because it's different for different people
. On the other hand, the time is not plenty of, and at least you wan't to be able to judge in what direction you could put your effort, without discover afterwards that you did every turn wrong on the way.I don't want to build 10 tube-amps. About two or three is fine for me
. OK to fine tune afterwards.My RIIAA stage will be very influensed from John Broskie's articles from 2002, but I will have a bit of my own touch up on it. An Aikido approach will be taken there to. Anyway, if I ever get it to reality I will share it. This forum rules
koolatron:
Good to hear your PSU worked fairly well. I can see it's almost exactly as the "The Maida Regulator", floating around in different shapes and flavours.
Changed tubes
Hi to all,
After long time without coming to my blog what i did was to replace my power supply transformer for a EDCOR and change the tubes to JJ and since then everything works fine. I just adjust the bias and then I never had any problem with my amp. It just sounds fantastic!
I never had built the regulator so far.
Thanks to everybody that helped me.
🙂
I'm going to open a new blog where I'm going to build a KT-88 ultra-linear project based on Satoru Kobayashi 2002 design. I'm going to sell the circuit board also.
I'll let you know the link.
Warm regards,
Hi to all,
After long time without coming to my blog what i did was to replace my power supply transformer for a EDCOR and change the tubes to JJ and since then everything works fine. I just adjust the bias and then I never had any problem with my amp. It just sounds fantastic!
I never had built the regulator so far.
Thanks to everybody that helped me.
🙂
I'm going to open a new blog where I'm going to build a KT-88 ultra-linear project based on Satoru Kobayashi 2002 design. I'm going to sell the circuit board also.
I'll let you know the link.
Warm regards,
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