Attachments
This is my first hybrid amplifier and the first power amplifier with tubes. (currently not in the output stage, but someday will)
For voltage amplifier I put 6S4P with cascoded DN2540 pair, the output stage is 2SK1058/SJ162 with simple circuitry for adjusting quiescent current and offset, the amplifier was made without negative feedback.Amplifier still waiting for accommodation in the right box.
For voltage amplifier I put 6S4P with cascoded DN2540 pair, the output stage is 2SK1058/SJ162 with simple circuitry for adjusting quiescent current and offset, the amplifier was made without negative feedback.Amplifier still waiting for accommodation in the right box.
Hey Airhead
great gear in suomi --- imagine to have a listing session
best regards from Hamburg
Shanghai Wally
great gear in suomi --- imagine to have a listing session
best regards from Hamburg
Shanghai Wally
Why you humiliate to Us?
Why you humiliate to Us?
Don't show more please.
What we gonna do in the future?
Best Regards and congratulations. 😀
Why you humiliate to Us?
Don't show more please.
What we gonna do in the future?
Best Regards and congratulations. 😀
My almost completed (not completely finished, but fully functioning) low voltage line level tube preamp, designed and built by myself. All of the woodwork, metalwork, and electronics were done by myself.
Using two RCA 12AU7A dual triode tubes, heaters and B+ is 12.3VDC.
Any comments are welcome!
Using two RCA 12AU7A dual triode tubes, heaters and B+ is 12.3VDC.
Any comments are welcome!
Attachments
Actually, no, not yet.
I'm still making a few changes to this preamp, and I've never made a schematic before so it might take a bit for me to get familiar with Eagle and make one up.
Thank you for your interest though, I'll be sure to let you know when I have a schematic made up.
OHHMMM!
No it's not a typing error, it is indeed running on 12.3VDC, no step up converters or anything else.
These tubes just work fine on this much power.
My preamp actually does increase the volume quite a noticeable bit when put before a normal amp or receiver, however it lacks the wattage to make even normal headphones loud enough for normal listening. All it really does is increase the signal (voltage) but requires an amplifier afterwards because of its lack of wattage.
I did a bit of research before designing and building this preamp and I did see a lot of information that told me the 12AU7's (and its almost identical brother the 12AU7A which I use) are better on low voltage than the venerable 12AX7. There are many schematics for low voltage headphone amps with a single 12AU7 but they all use solid state after the tube to reverse the phase of the signal and also to give it more wattage to drive headphones, but I wanted to go with a completely unique circuit that was nowhere else online, that only used tubes and no solid state.
I also opted for a low voltage setup for a few reasons. Firstly, it is more unique than your average preamp. Secondly, since this is the first time designing my own preamp, I wanted to be able to fiddle around with it and try things out without worrying about having a tangle of alligator clips at 120v+ all over my desk.
Not that I'm not safe, or afraid of HV but I thought it'd be easier to play with these tubes at low voltage. I've worked on a radio with some pretty HV before though.
These tubes just work fine on this much power.
My preamp actually does increase the volume quite a noticeable bit when put before a normal amp or receiver, however it lacks the wattage to make even normal headphones loud enough for normal listening. All it really does is increase the signal (voltage) but requires an amplifier afterwards because of its lack of wattage.
I did a bit of research before designing and building this preamp and I did see a lot of information that told me the 12AU7's (and its almost identical brother the 12AU7A which I use) are better on low voltage than the venerable 12AX7. There are many schematics for low voltage headphone amps with a single 12AU7 but they all use solid state after the tube to reverse the phase of the signal and also to give it more wattage to drive headphones, but I wanted to go with a completely unique circuit that was nowhere else online, that only used tubes and no solid state.
I also opted for a low voltage setup for a few reasons. Firstly, it is more unique than your average preamp. Secondly, since this is the first time designing my own preamp, I wanted to be able to fiddle around with it and try things out without worrying about having a tangle of alligator clips at 120v+ all over my desk.
Not that I'm not safe, or afraid of HV but I thought it'd be easier to play with these tubes at low voltage. I've worked on a radio with some pretty HV before though.
Last edited:
Sorry Mister TheTubeAmper 🙂
Excuse to me for deprecate your findings. I couldn't advert that is 12.3 volts and I guess only 12volts.
Anyway, this topic is about the gallery. About the building of Our best things. I think that more deep knowledge is in another topic and I will not survive in a discussion with you. I suggest a book that teach me so much and recently the 4th and last edition. Valve amplifiers from Morgan Jones. I got some time ago the 3th edition and this is one of my best investments. Few Math, comprehensible at all.But is deep also.🙂 Imagine, I can understood.
Best Regards😉
Excuse to me for deprecate your findings. I couldn't advert that is 12.3 volts and I guess only 12volts.
Anyway, this topic is about the gallery. About the building of Our best things. I think that more deep knowledge is in another topic and I will not survive in a discussion with you. I suggest a book that teach me so much and recently the 4th and last edition. Valve amplifiers from Morgan Jones. I got some time ago the 3th edition and this is one of my best investments. Few Math, comprehensible at all.But is deep also.🙂 Imagine, I can understood.
Best Regards😉
Interesting build. Like the others, I'd also be interested in the schematic. Thanks for posting.
Hi everyone, this is my futerman otl monoblocks
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
Last edited: