PinoyDVD: The Pinoy Digital Video & Devices Community
Home Theater => Audio => Tubes => Topic started by: rochie on Aug 03, 2016 at 02:27 PM
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Ill be starting my tube preamp and tube amp build.
got the kits from a friend from China.
test equipments also came from him :D :D :D
(http://i1282.photobucket.com/albums/a533/r0ch13/microMsg.1469536776849_zps1ctuasef.jpg) (http://s1282.photobucket.com/user/r0ch13/media/microMsg.1469536776849_zps1ctuasef.jpg.html)
(http://i1282.photobucket.com/albums/a533/r0ch13/IMG-1465129708229-V_zps2q9sp9hm.jpg) (http://s1282.photobucket.com/user/r0ch13/media/IMG-1465129708229-V_zps2q9sp9hm.jpg.html)
(http://i1282.photobucket.com/albums/a533/r0ch13/P_20160605_171000_zpsnbgxkrt3.jpg) (http://s1282.photobucket.com/user/r0ch13/media/P_20160605_171000_zpsnbgxkrt3.jpg.html)
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rochie, that diy line amp has two big holes and two small ones aside from the rectifier...
so a phono stage and 6sn7 line stage ala vacuum tube valley can be made....http://www.tiffe.de/roehren/VTV/VTV11.pdf
phono stage can be passive type from the rca manual...
https://www.google.com.ph/search?q=phono+stage+can+be+passive+type+from+the+rca+manual.&oq=phono+stage+can+be+passive+type+from++the+rca+manual.&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8
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rochie, that diy line amp has two big holes and two small ones aside from the rectifier...
so a phono stage and 6sn7 line stage ala vacuum tube valley can be made....http://www.tiffe.de/roehren/VTV/VTV11.pdf
phono stage can be passive type from the rca manual...
https://www.google.com.ph/search?q=phono+stage+can+be+passive+type+from+the+rca+manual.&oq=phono+stage+can+be+passive+type+from++the+rca+manual.&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8
cool, thanks Sir Tony for the info.will build the first kit as is and then will build another one with phono stage as recommended. sabay kami ni Ralph mag build hehehehe meron din sya tube preamp kit.
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cool, thanks Sir Tony for the info.will build the first kit as is and then will build another one with phono stage as recommended. sabay kami ni Ralph mag build hehehehe meron din sya tube preamp kit.
the preamp was a variation of the marantz 7 topology using the 6V6 and 6au6 pentodes..
first implemented with the 12ax7's...
and uses lots of global negative feedback, why so many audiophools like them is an enigma....
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Sir Special Request.. baka pede pashow how to test this amp....(of course when finished already....)
Cheers.
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Sir Special Request.. baka pede pashow how to test this amp....(of course when finished already....)
Cheers.
i do it in stages, first you wire up the filaments, then power up and see that all tubes are lit....
then the psu, then on to the output tube and finaly the input tube, this is the sequence that i follow...
do not do everything at once, do it incrementaly, per tube and double check....
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i do it in stages, first you wire up the filaments, then power up and see that all tubes are lit....
then the psu, then on to the output tube and finaly the input tube, this is the sequence that i follow...
do not do everything at once, do it incrementaly, per tube and double check....
actually yan ang plano ko Sir Tony,
filament muna para makita kung mag glow mga tubes.
pero unahin ko muna yung preamp kit para mas madali.
nakabit ko na nung weekend yung mga mechanical. will try to wire the filament/heater on my rest day
(https://scontent.fmnl4-5.fna.fbcdn.net/v/t1.0-0/p526x296/13920684_10154419266541563_2889300002708228705_n.jpg?oh=3e685f2533770b6c0365804622af5b1e&oe=58188DF6)
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i do it in stages, first you wire up the filaments, then power up and see that all tubes are lit....
then the psu, then on to the output tube and finaly the input tube, this is the sequence that i follow...
do not do everything at once, do it incrementaly, per tube and double check....
Noted. This is seems logical for easy trouble shooting and safety.
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Noted. This is seems logical for easy trouble shooting and safety.
indeed, getting then done in stages is the best way....
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indeed, getting then done in stages is the best way....
mas madali din mag troubleshoot.
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indeed, getting then done in stages is the best way....
With paying special attention on capacitor discharging.... with or without the bleeder....
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bleeders are imperative for safety, i use at least a 3 watt 1.5M resistor...
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Build Pics :)
Painted the stainless chassis with hammerfinish
(http://img.photobucket.com/albums/v227/rough512/Tube%20Preamp%202/E53ADF8B-513B-4C15-A150-31BE7BD45381_zps1zzkqwbg.jpg)
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Point to point wiring of components. I used a bus wire for ground, running from the power supplu up to the volume control.
(http://img.photobucket.com/albums/v227/rough512/Tube%20Preamp%202/B7CEB52C-7E83-42F9-85CF-D8D5A6816DD6_zpsbn9s2d1w.jpg)
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(http://img.photobucket.com/albums/v227/rough512/Tube%20Preamp%202/B7CEB52C-7E83-42F9-85CF-D8D5A6816DD6_zpsbn9s2d1w.jpg)
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Final zipties
(http://img.photobucket.com/albums/v227/rough512/Tube%20Preamp%202/343600C8-54D6-4258-A7DD-DC347BB69169_zpsb00kwgif.jpg)
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Done....
Almost. ;D ;D
(http://img.photobucket.com/albums/v227/rough512/Tube%20Preamp%202/BF11A74C-7317-4DF4-B9B7-6AC39F2CF498_zpsir0lyjex.jpg)
I need a muting circuit for this preamp. During power-on, it activates my amp's DC protect.
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cool.
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First time ko makagamit ng heater wires na may center tap. Yung sa picture sa taas, di ko sya naikonek sa PS ground, kaya yung initial power-on, nakilala ko si Major Hum. Ang kulit na at malakas ang dating nya. Pero napalayas ko rin sya after ko makonek yung center-tab sa PS Ground.
Okay yung tunog nya maliban lang dun sa power-on DC surge.
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look at the heater to cathode voltage specs on the datasheets
of tubes you are using, this is very important,
if there is a chance that this will be exceeded,
then dc voltage lifting filaments is a
good way to eliminate hum and or buzzz....https://www.google.com.ph/search?q=then+dc+voltage+lifting+filaments&rlz=1C1CHBF_enPH711PH711&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj75-TZhPHRAhXBEpQKHZt_CkkQ_AUICCgB&biw=1366&bih=648
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First time ko makagamit ng heater wires na may center tap. Yung sa picture sa taas, di ko sya naikonek sa PS ground, kaya yung initial power-on, nakilala ko si Major Hum. Ang kulit na at malakas ang dating nya. Pero napalayas ko rin sya after ko makonek yung center-tab sa PS Ground.
Okay yung tunog nya maliban lang dun sa power-on DC surge.
baka kailangan ng delay sa power on ng amp kung iisa lang ang power switch? alam ko meron ako ganon na nakatago,kailangn lang palitan value ng capacitor kung gaano katagl yung delay na gusto mo.
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Okay yung tunog nya maliban lang dun sa power-on DC surge.
you can insert higher impedances on the psu....
tubes are such low current consumers that even high resistance
in the psu will not harm operation....
also, the output cap of that line amp must have a resistor from
output to ground, 100 to 220k is a good one to use...
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@fantom_mayonaise nandito lng pala kayo... quite a while since I saw you at elab... great work :)
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John, nasa abroad sya sa pagkakaalam ko.....
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Sir JohnR :
Kumusta po. Sir Tony andito lang po ako sa Makati. Dumalaw lang sa sister ko last year.
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fanthom, post ka rin dito: http://www.elab.ph/forum/index.php?topic=34991.msg909848#new