You can use ECC86/6GM8/6N27P.
http://www.b-kainka.de/bastel17.htm
http://www.tubecad.com/2006/04/blog0059.htm
http://www.geocities.com/dmitrynizh/Ultrapath.htm
http://www.b-kainka.de/bastel17.htm
http://www.tubecad.com/2006/04/blog0059.htm
http://www.geocities.com/dmitrynizh/Ultrapath.htm
Bem-bem said:for shoog, can you give me "audiodigit" tubalizer & tubepre complete schematic ? thanks
A simple search of the forum would have found it.
I made my own schematic of the Tubalizer ( Unfortunately, I bought one for 80 Euros!!!). I had problems when using it on the recommended 12V but it works very well on 24V. It is supplied with a 6SL7 but I prefer to use it with 6SN7. I recommend designing the 6volt heater regs on a seperate supply if possible because the regulator gets REALLY hot when fed with 24V, especially with the 6SN7.
You should also read this thread. AlaistairE has designed a very nice low voltage pre that would be great for 24v. I have tried it and it's very good. http://www.diyaudio.com/forums/showthread.php?s=&threadid=89195&highlight=
Kind regards,
Martin.
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jleaman said:Sonusthree,
what kind of charictoristics changed when you up'd the voltage from 12v > 24 ?
Wouldent it be easyer if yuo just used a nice 6V battery insted of a regulator ?
Jase
Hi Jase,
I found that it distorted badly at 12v but your experience may be different. It is commercially available design (80 Euros) and was made to run from a 12V wall wart. No problems at 24V for me. Actually, It would probably work OK at 16 - 18Volts but I haven't tested this myself.
A 6volt battery might work but I wouldnt like to replace the battery and, at this low voltage, I would imagine that the correct heater voltage would become more important. I'd rather stick with a 9 or 12volt supply to a 6V regulator for now.
I have commented further in this thread (that you have also posted in): http://www.diyaudio.com/forums/showthread.php?s=&postid=1199466#post1199466
Cheers,
Martin S3
Bem-bem said:anyone can help me ! I need schematic 24v tube buffer & line stage schematic. Thanks.
This one works from a 12V battery:
http://www.audiofaidate.it/forum/uploaded/plovati/PREcario_darlitotem_lowres.JPG
gain 13.7
BW (-1dB) 12Hz .. 250kHz
clipping Vout max 3Vrms on 27Kohm load
THD at 2Vrms 1%, 2nd harmonic only
THD at 1Vrms 0,78%, 2nd harmonic only ( -50dB)
output resistance less than 600ohm
Simpleton said:Simple grounded cathode line amplifier stage using ECC86:
R(grid bias): 100k
Rk: 160Ohm (or closer)
Cathode bypass cap: 50uF
Ra:2.5k
B+: 25V
Vin: 1Vpp
Vout: 10.25Vrms
Ia: 3.1mA
Ia max: 3.5mA
Calculated distortion (2nd hamonic): 1%
Ra*Ia = 7.75V
Shouldn't possible to get 10.25V rms out (that means 14.45V peak) beacuse on the anodic resistor there is no enough volatge headroom.
The distortion of 1% seems too optimistic, in practice I think will be 1% at few volts rms.
This one works from a 12V battery:
http://www.audiofaidate.it/forum/uploaded/plovati/PREcario_darlitotem_lowres.JPG
gain 13.7
BW (-1dB) 12Hz .. 250kHz
clipping Vout max 3Vrms on 27Kohm load
THD at 2Vrms 1%, 2nd harmonic only
THD at 1Vrms 0,78%, 2nd harmonic only ( -50dB)
output resistance less than 600ohm
We re-organized all the AUDIOFAIDATE forum, noe we're on www.audiofaidate.org Il sito indipendente degli audiocostruttori.
Please take note of the new link to PREcario low voltage tube preamplifier
New link:
http://www.audiofaidate.org/uploaded/plovati/PREcario_darlitotem_lowres.JPG
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