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Author Topic: Vacuum tube amplifiers  (Read 55747 times)

Offline ???

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Re: Vacuum tube amplifiers
« Reply #1220 on: May 10, 2012, 09:27:31 PM »
UHMM me beta build na si ryu.
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Re: Vacuum tube amplifiers
« Reply #1220 on: May 10, 2012, 09:27:31 PM »

Offline 01110011

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Re: Vacuum tube amplifiers
« Reply #1221 on: May 10, 2012, 09:32:22 PM »
congrats on your first tube build :) ++
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Re: Vacuum tube amplifiers
« Reply #1221 on: May 10, 2012, 09:32:22 PM »

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Re: Vacuum tube amplifiers
« Reply #1222 on: May 10, 2012, 09:33:49 PM »
Quote from: ??? on May 10, 2012, 09:27:31 PM
UHMM me beta build na si ryu.
yep , sa casing pa lang, kinahoy lang na BOOSTER :D

Quote from: 1SaGing5 on May 10, 2012, 09:32:22 PM
congrats on your first tube build :) ++
thanks, o ano pa hinihintay mo? sakay na! ;D ;D ;D
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Re: Vacuum tube amplifiers
« Reply #1222 on: May 10, 2012, 09:33:49 PM »

Offline efren

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Re: Vacuum tube amplifiers
« Reply #1223 on: May 10, 2012, 09:38:15 PM »
ayan, mas simple pa ang ccs ng tubo, old school pa rin ;D pero lagyan mo ng gate stopper ang mosfet, yun dating value na 220 Ohms.
how is your listening impression, pero maganda sana dalawa gumagana... :)

+1
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Re: Vacuum tube amplifiers
« Reply #1223 on: May 10, 2012, 09:38:15 PM »

Offline 01110011

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Re: Vacuum tube amplifiers
« Reply #1224 on: May 10, 2012, 09:39:25 PM »
Quote from: Ryu on May 10, 2012, 09:33:49 PM
yep , sa casing pa lang, kinahoy lang na BOOSTER :D
thanks, o ano pa hinihintay mo? sakay na! ;D ;D ;D
^hihi tatapusin/gagawin ko muna yung leach bago ako mag move-on sa tubes ;D

video!video!video :D
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Re: Vacuum tube amplifiers
« Reply #1224 on: May 10, 2012, 09:39:25 PM »

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Re: Vacuum tube amplifiers
« Reply #1225 on: May 10, 2012, 10:06:58 PM »
Um pede ba magrequest ng paggawa mo sis ng masundan namin.


Mahina comprehension ko eh.   :D
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Re: Vacuum tube amplifiers
« Reply #1226 on: May 10, 2012, 10:10:13 PM »
Quote from: efren on May 10, 2012, 09:38:15 PM
ayan, mas simple pa ang ccs ng tubo, old school pa rin ;D pero lagyan mo ng gate stopper ang mosfet, yun dating value na 220 Ohms.
how is your listening impression, pero maganda sana dalawa gumagana... :)

+1
will do that tomorrow, eto pati parents ko nakikinig na rin ;D ;D ;D


Quote from: 1SaGing5 on May 10, 2012, 09:39:25 PM
^hihi tatapusin/gagawin ko muna yung leach bago ako mag move-on sa tubes ;D


video!video!video :D
vid? ;D matagal pa..

Quote from: ??? on May 10, 2012, 10:06:58 PM
Um pede ba magrequest ng paggawa mo sis ng masundan namin.


Mahina comprehension ko eh.   :D
bukas post pics ako sa "beta build ko" :D

I find this tube to be natural on bass area. sa high, may hahanapin pa ba ako? :D pure na pure eh ;D ;D ;D

about sa filament/heater issues, ung LM317 tpos mga 2 ohms na resistor ung ginamit ko, malaki pala role ng heater na yan ;D ;D ;D
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Offline efren

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Re: Vacuum tube amplifiers
« Reply #1227 on: May 10, 2012, 10:12:27 PM »
here's my suggestion to improve performance further:

1. since it is class A(from tube to mosfet) use cap multiplier in your PSU

2. i noticed there is no coupling cap in the schematic, use one, a 1000uF/25v will do, parallel a 0.1mylar or      ceramic

3. use high quality caps for C1/C3

NOTE: the tube used in the given schematic has a 12V heater, you are using 6V heater, use at least 8 Ohms 5W to avoid busting out your heater. :)
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Re: Vacuum tube amplifiers
« Reply #1228 on: May 10, 2012, 10:15:20 PM »
Quote from: efren on May 10, 2012, 10:12:27 PM
here's my suggestion to improve performance further:

1. since it is class A(from tube to mosfet) use cap multiplier in your PSU

2. i noticed there is no coupling cap in the schematic, use one, a 1000uF/25v will do, parallel a 0.1mylar or      ceramic

3. use high quality caps for C1/C3

NOTE: the tube used in the given schematic has a 12V heater, you are using 6V heater, use at least 8 Ohms 5W to avoid busting out your heater. :)


ung c1 pde na ba dyan ung JAKEC? ung minsang ginagamit sa tweeters?
ung c3 naman rubycon ginamit ko.
battery po ng jeepneys ung gamit ko pansamantala (marami kami dito jeepneys ;D ;D ;D )
coupling cap? ung cap na nasa rail?
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Offline efren

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Re: Vacuum tube amplifiers
« Reply #1229 on: May 10, 2012, 10:21:31 PM »
Quote from: Ryu on May 10, 2012, 10:10:13 PM

I find this tube to be natural on bass area. sa high, may hahanapin pa ba ako? :D pure na pure eh ;D ;D ;D

about sa filament/heater issues, ung LM317 tpos mga 2 ohms na resistor ung ginamit ko, malaki pala role ng heater na yan ;D ;D ;D
yang heater na yan ang nagbibigay buhay sa tubo, hence the tube operates by means of thermionic emmision. yan ang tinatawag ng iba na "captivating glow", magical glow, etc, etc ;D
Quote from: Ryu on May 10, 2012, 10:15:20 PM

coupling cap? ung cap na nasa rail?
yup
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Offline 01110011

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Re: Vacuum tube amplifiers
« Reply #1230 on: May 10, 2012, 10:26:21 PM »
sis ryu, kay sir tony ba galing yung tubes mo? magkano score mo jan? ;D
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Re: Vacuum tube amplifiers
« Reply #1231 on: May 10, 2012, 10:29:38 PM »
Quote from: 1SaGing5 on May 10, 2012, 10:26:21 PM
sis ryu, kay sir tony ba galing yung tubes mo? magkano score mo jan? ;D
pm mo siya ;D ;D ;D


Quote from: efren on May 10, 2012, 10:21:31 PM
yang heater na yan ang nagbibigay buhay sa tubo, hence the tube operates by means of thermionic emmision. yan ang tinatawag ng iba na "captivating glow", magical glow, etc, etc ;D
hehe akala ko dati ung plate ang ang gglow un pala heater..
thanks again sir and MORE BUILDS TO COME ;D ;D ;D
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Offline efren

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Re: Vacuum tube amplifiers
« Reply #1232 on: May 10, 2012, 10:35:54 PM »
pwede din yan as pre-amp, gamitin mo sa mga hi-power amp mo, mag-series ka lang 2.2k sa output. pero da best yan sa class A amps...

Quote from: Ryu on May 10, 2012, 10:29:38 PM
hehe akala ko dati ung plate ang ang gglow un pala heater..
thanks again sir and MORE BUILDS TO COME ;D ;D ;D
nag go-glow din yan sa mga power tubes pag di tama biasing mo, kasunod na nyan flash-over na sisira sa grid or tube melt-down ;D

umpisa palang yan, pag tumalab na ng husto ang rabis ng tubo sayo, d mo na yan mapipigilan ;D ;D
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Re: Vacuum tube amplifiers
« Reply #1233 on: May 10, 2012, 10:40:00 PM »
Quote from: efren on May 10, 2012, 10:35:54 PM
pwede din yan as pre-amp, gamitin mo sa mga hi-power amp mo, mag-series ka lang 2.2k sa output. pero da best yan sa class A amps...
 nag go-glow din yan sa mga power tubes pag di tama biasing mo, kasunod na nyan flash-over na sisira sa grid or tube melt-down ;D

yup ginamit ko as preamp lang muna sa sakura/konzert clone ko.

Quote
umpisa palang yan, pag tumalab na ng husto ang rabis ng tubo sayo, d mo na yan mapipigilan ;D ;D
;D ;D ;D
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Offline wipeout

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Re: Vacuum tube amplifiers
« Reply #1234 on: May 11, 2012, 06:40:19 AM »
Quote from: efren on May 10, 2012, 02:13:52 PM
sa akin floating, so sometimes kung gusto ko mono, bini-bridge ko sya...

Thanks for the tips!
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Re: Vacuum tube amplifiers
« Reply #1235 on: May 11, 2012, 09:24:44 AM »
kung i increase ko B+ neto, this will lessen the distortion and more power din ba?
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Re: Vacuum tube amplifiers
« Reply #1236 on: May 11, 2012, 02:31:13 PM »
kaya pala di ko mapatino nang husto, kailangan pala ng R1, kung wala yan , mangangamote ;D ;D ;D
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Offline efren

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Re: Vacuum tube amplifiers
« Reply #1237 on: May 11, 2012, 04:49:18 PM »
Quote from: Ryu on May 11, 2012, 02:31:13 PM
kaya pala di ko mapatino nang husto, kailangan pala ng R1, kung wala yan , mangangamote ;D ;D ;D
di mo nilagay? yan ang mag set ng grid bias.

Quote from: Ryu on May 11, 2012, 09:24:44 AM
kung i increase ko B+ neto, this will lessen the distortion and more power din ba?
will make the tube operate more linear, hence lower distortion & larger voltage swing, let the output device takes care of power.
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Offline tony

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Re: Vacuum tube amplifiers
« Reply #1238 on: May 11, 2012, 04:52:31 PM »
hindi pa kasi masisisra yung tubes pag ganyan, walang bias yung tube mo, so walang current draw...yan ang kagandahan ng tubes, forgiving sya sa mistakes....
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Offline tony

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Re: Vacuum tube amplifiers
« Reply #1239 on: May 11, 2012, 05:01:23 PM »
tube lessons for Ryu,

1. kailangan nakailaw ang filament.
2. Kailangan respetuhin ang filament voltage and current ratings
3. kailangan ng cathode resistor para magset ng negative grid voltage.
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Re: Vacuum tube amplifiers
« Reply #1239 on: May 11, 2012, 05:01:23 PM »
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