Hello ,
I build a RIAA-preamp with 6021 in the RIAA-stage and 6111 as line-amp . I have build many versions of it for friends , and one for me as "The smallest preamplifier in the World" ?? , the power supply is in an extra case and regulated with transistors . I used mini-tuchel connectors for in-and output connection , but there was only place on the back for MM-input and Line-in and Out . For the other amps I have made a printed circuit board with power supply and the tubes are soldered directly to the board . Pictures on my homepage .
Regards , Alex .
www.alextubefotos.gmxhome.de
I build a RIAA-preamp with 6021 in the RIAA-stage and 6111 as line-amp . I have build many versions of it for friends , and one for me as "The smallest preamplifier in the World" ?? , the power supply is in an extra case and regulated with transistors . I used mini-tuchel connectors for in-and output connection , but there was only place on the back for MM-input and Line-in and Out . For the other amps I have made a printed circuit board with power supply and the tubes are soldered directly to the board . Pictures on my homepage .
Regards , Alex .
www.alextubefotos.gmxhome.de
Hello ,
the answer is very easy , the amp is small but the sound is great . Too difficult for me , to describe all this in english , but believe me , it is worth , to spend time with this little tubes .
In the next weeks , I finished the whole desription with printed circuit board and schematic on my homepage and then it is easy , to build this amp for you , if you want .
I will try another tube in the first RIAA-stage , the 7963 , more amplification than 6021 with the same pinout .
One of my next projekts is a SE or push-pull micro-amp with 5639 , I got many of them as a gift from a friend .
Regards , Alex.
the answer is very easy , the amp is small but the sound is great . Too difficult for me , to describe all this in english , but believe me , it is worth , to spend time with this little tubes .
In the next weeks , I finished the whole desription with printed circuit board and schematic on my homepage and then it is easy , to build this amp for you , if you want .
I will try another tube in the first RIAA-stage , the 7963 , more amplification than 6021 with the same pinout .
One of my next projekts is a SE or push-pull micro-amp with 5639 , I got many of them as a gift from a friend .
Regards , Alex.
i bought some 6021's after seeing the imp amp...now i realize there is more to this amp than it seemed at first...
but are there any good schematics somewhere to utilize these cute little tubes?
i havnt been able to find much other than for guitar.
i would love to be able to use these for a small bedroom type amp
or maybe to enhance my computer speaker system
(harmon kardon)
but are there any good schematics somewhere to utilize these cute little tubes?
i havnt been able to find much other than for guitar.
i would love to be able to use these for a small bedroom type amp
or maybe to enhance my computer speaker system
(harmon kardon)
I got interested in these tubes a year or so ago - main starting page for info for me was http://amps.zugster.net/projects/subminiature and http://www.roehrentechnik.de/html/kolibri.html (I really liked this one).
Cheers!
Cheers!
Hello ,
my whole preamp - project is now here :
http://www.ak-tubes.de/Vorverstaerker/Pencil tube/pencil_tube_preamp.htm
Regards , Alexander .
my whole preamp - project is now here :
http://www.ak-tubes.de/Vorverstaerker/Pencil tube/pencil_tube_preamp.htm
Regards , Alexander .
RE 604, can you tell me about the gain of your 6111 line stage?
I ask because a friend gave me an Audionote Zero which uses a 6111 and has the most enormous gain. In a normal type of system with cd input the volume control barely goes past 9 o'clock and is almost unuseable.
I also believe the Quad preamp (QC?) uses a 6111 and may have been designed by the same person - Andy Groves (?) who I recall did some of the World Audio Design kit amps.
thanks, sp
I ask because a friend gave me an Audionote Zero which uses a 6111 and has the most enormous gain. In a normal type of system with cd input the volume control barely goes past 9 o'clock and is almost unuseable.
I also believe the Quad preamp (QC?) uses a 6111 and may have been designed by the same person - Andy Groves (?) who I recall did some of the World Audio Design kit amps.
thanks, sp
correct
yes, I am a bit of a student of andy grove, he did the
audionote zero preamp, and phonostage,
and the quad preamp, but tim de para did the quad phonostage.
he did afaik, 3 valve preamps for world audio
the first one used ecc88s with a gain of around 4 but it used feedback around a single tridoe stage for the line amp.
(There was also a non phono version (line only) which simply used an ecc88 cathode follower, no voltage gain.)
the second used a ecc88 again I think, transformer loaded to give a lowish gain.
and the final one used 2 cascaded ecc82s with a transformer again giving a lowish gain.
I would be VERy interested in obtaining schematics for the audionote zeros, and the quad pre's.
or if you have it, VERY good close in photos would be gratefully appreciated, so I can identify the anode and cathode resistor values
I would really like it if you could do that for me
just info for you, best wihses
yes, I am a bit of a student of andy grove, he did the
audionote zero preamp, and phonostage,
and the quad preamp, but tim de para did the quad phonostage.
he did afaik, 3 valve preamps for world audio
the first one used ecc88s with a gain of around 4 but it used feedback around a single tridoe stage for the line amp.
(There was also a non phono version (line only) which simply used an ecc88 cathode follower, no voltage gain.)
the second used a ecc88 again I think, transformer loaded to give a lowish gain.
and the final one used 2 cascaded ecc82s with a transformer again giving a lowish gain.
I would be VERy interested in obtaining schematics for the audionote zeros, and the quad pre's.
or if you have it, VERY good close in photos would be gratefully appreciated, so I can identify the anode and cathode resistor values
I would really like it if you could do that for me
just info for you, best wihses
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