Vacuum tube amplifiers

[tony]

pwede yun..

[Disabled]

pwede yun..

ok sir , nag try ako sa 53vdc, distorted.. takot pa ako sa 100, 53 lang muna

[efren]

try the old school way also.

1.replace 2,200 uF w/ 4.7uF non polar, those used on tweeters will do fine

2. replace 2uF w/ a .047/400V mylar you can find these on discarded psu or TV boards. (if not available .02, .05 .1 will also do fine.

3. since you will be using these on solid state amp, series a 220K at the output after 1meg. the purpose is to virtually isolate the high Z output of tube to the low Z input of SS amp. you can increase the rail to 100V this time, Rp=100K.

4. place 1meg from grid to ground

Please post results  

[Disabled]

try the old school way also.

1.replace 2,200 uF w/ 4.7uF non polar, those used on tweeters will do fine

2. replace 2uF w/ a .047/400V mylar you can find these on discarded psu or TV boards. (if not available .02, .05 .1 will also do fine.

3. since you will be using these on solid state amp, series a 220K at the output after 1meg. the purpose is to virtually isolate the high Z output of tube to the low Z input of SS amp. you can increase the rail to 100V this time, Rp=100K.

4. place 1meg from grid to ground

Please post results  

di pde 100k o 220k? wala ako ngayon in hand.

[efren]

pwede, make it 220k.

with that set up you will achieve more or less the sound of the past, when tubes was at the height their glory 

the pot was too low, if you have 100k replace it.

[efren]

ok sir , nag try ako sa 53vdc, distorted.. takot pa ako sa 100, 53 lang muna

because the output was not isolated, i understand you are using solid state amp, actually you can play with values starting from 220K up to 470K, whichever matches your preference, much better for experimentation purpose, use a 500K trimpot 

In my opinion that tube (& me ) will be much happy with a 100V rail, just exercise caution...

[Disabled]

because the output was not isolated, i understand you are using solid state amp, actually you can play with values starting from 220K up to 470K, whichever matches your preference, much better for experimentation purpose, use a 500K trimpot 

In my opinion that tube (& me ) will be much happy with a 100V rail, just exercise caution...

hehe meron ako dito 100k trimpot, cge update ako maya maya, 1 channel lang muna tirahin ko.

[efren]

hehe meron ako dito 100k trimpot, cge update ako maya maya, 1 channel lang muna tirahin ko.

trimpot or pot?, mahirapan ka i -volume yan

[Disabled]

trimpot or pot?, mahirapan ka i -volume yan

pot pala..
the tube now runs @ 100VDC, output ung SS. kaso di maitodo. dito na ba papasok ung gagamit na ng mosfet as power??

[efren]

anong di maitodo? distorted pa rin ba?

[Disabled]

anong di maitodo? distorted pa rin ba?

parang impedance mismatch , nag separate supply ako pansamantala, ung B+ 100 tpos sa class a, ( mosfet) 12vdc battery , eto ang lakas swabeng swabe

[efren]

gawin mo na 330 or 470K resistor sa output...iLan nga pala value ng blocking cap mo?

[Disabled]

gawin mo na 330 or 470K resistor sa output...iLan nga pala value ng blocking cap mo?

blocking cap = 1uf 250V = ung makikita sa mga PSU

[efren]

ang laki pala, hanap ka .047, .05, 0.1 kahit alin dyan pupwede or any value in between ng mga yan.

[efren]

wala bang humming, cracking of sound, wala bang umuusok

nandyan na pala si sir tony, kain muna ako

[Disabled]

wala bang humming, cracking of sound, wala bang umuusok

nandyan na pala si sir tony, kain muna ako

wala naman sir, everything seems to be fine . i hope
iniisip ko kasi kanina to

kaso ung LM317,mukhang no no no na sa 100VDC. kaya nag separate supply ako..
btw kakailanganin pa ba ng cap sa gate ng mosfet?

[efren]

so ok na pala, implement using both channels, later you can also implement that cathode follower design, that should match your SS amp, for the meantime enjoy the fruit of your labor, that elusive tube sound

[Disabled]

^ ok na po sir, implement ko na bukas..

[efren]

how is the sound quality this time, how does it perform in the mid to high frequencies, what about the bass?

[Disabled]

how is the sound quality this time, how does it perform in the mid to high frequencies, what about the bass?

di ko pa ma feel, kasi maliit lang na speakers ung gamit ko baka bukas ko na ma appreciate.