Topic: JojoD's Tube and Solid State Projects

[Cjtjader]

ang sarap sa pandesal yan sardines brader yun medyo spicy... whew!

+100 kung spanish sardines yan!!! extra pickles on the side, please!!!!

[timber715]

Yup yun nasa bote brader, ayaw ko nun nasa lata masyado na malabsa, eh lalu ako nanglalambot hehehe... 

Try mo din lagyan ng calamansi... 

actually brader, with spaghetti noodles, it becomes a special italian dish

[JojoD818]

actually brader, with spaghetti noodles, it becomes a special italian dish

hindi ko pa natry ito ah... 

[JojoD818]

been looking at Yaqin's CD2 and is it my eyes or it is really a cathode follower with one triode per tube?

[ATJr.]

been looking at Yaqin's CD2 and is it my eyes or it is really a cathode follower with one triode per tube?

what did you expect? you know these chinese......they have fertile imagination.....

[JojoD818]

what did you expect? you know these chinese......they have fertile imagination.....

well I was tasked to study one for a possible "mod" so I end up plotting the circuit with the help of pics from the net and to my dismay, another cathode follower. so this is just very similar to the Sakura av200t tube section with a highish plate supply and a different case.

talk about imagination, I was hoping for something a little bit more complex 

[ATJr.]

tubes are never complex, no matter how they appear to be.....

if that is the one with the 6J1 pentode wired as a triode, then you can make a straight pentode cathode follower, just 2 resistors and 2 caps and presto.....another flavor....

pentode cathode followers have lower output resistance......can drive cables better....

[ATJr.]

the sakura av200 have a plate volts of only 12volts dc......a 6GM8 tube would have been better in that spot...

from the pics, there is one design principle that the chinese have caught on to...that is the use of highish filter caps.......the usual design rule of thumb is 1000ufd per ampere, in that preamp, the chinese have simply outdid themselves........bravo!!!!!.......

[JojoD818]

tubes are never complex, no matter how they appear to be.....

if that is the one with the 6J1 pentode wired as a triode, then you can make a straight pentode cathode follower, just 2 resistors and 2 caps and presto.....another flavor....

pentode cathode followers have lower output resistance......can drive cables better....

I'm just be scratching my head on this... 

[JojoD818]

the sakura av200 have a plate volts of only 12volts dc......a 6GM8 tube would have been better in that spot...

from the pics, there is one design principle that the chinese have caught on to...that is the use of highish filter caps.......the usual design rule of thumb is 1000ufd per ampere, in that preamp, the chinese have simply outdid themselves........bravo!!!!!.......

oh yeah, the 6gm8 is noted for it's ruggedness as an automotive tube. I did a 24V 6gm8 Aikido before and it was a novelty now at Bicol.

indeed it has a hefty rectifier and filter section, those are 100uf 400V with a W02M diode, more than enough. better overkill than not.

I guess they thought that tubes are like solid state when tubes are more like voltage devices as solid state are more like current devices.

[ATJr.]

think of triodes as thevenin devices and pentodes as norton's.....

[JojoD818]

that would had probably been a good simile but should be better addressed to the manufacturers...

[ATJr.]

think of triodes as thevenin devices and pentodes as norton's.....

looking at the plate characteristic curves, triodes are simmilar to jfets.......whereas pentodes have bent curves much like bjt's, pentodes have very high plate resistance, so that is is often be ignored.....

going back to that yaquin preamp, i really wonder why the Chinese did not make it a pentode cathode follower instead, it would have cost them just 2 resistors and 2 capacitors......

[JojoD818]

looking at the plate characteristic curves, triodes are simmilar to jfets.......whereas pentodes have bent curves much like bjt's, pentodes have very high plate resistance, so that is is often be ignored.....

going back to that yaquin preamp, i really wonder why the Chinese did not make it a pentode cathode follower instead, it would have cost them just 2 resistors and 2 capacitors......

I was informed that it is being marketed abroad as a tube sound processor, maybe the idea of the manufacturers is not just to buffer, however, if it is not just a buffer I don't see the reality in actuality.   

I may have to call off the "mod", I'm not quite sure where it will lead if it pushes thru...

[ATJr.]

^this is a designer's call, you get 5 people to do the same thing and you will get 5 solutions........

[JojoD818]

one of which could be the best solution, but it almost always relies with the marketing....

[JojoD818]

Eureka!

It peaks! And it holds! 

http://www.youtube.com/watch?v=6iViAmiGM4s

[timber715]

Eureka!

It peaks! And it holds! 

http://www.youtube.com/watch?v=6iViAmiGM4s

very nice brader, seems everything's gonna be alright 

[JojoD818]

very nice brader, seems everything's gonna be alright 

thanks brader, yup it sure is 

[JojoD818]

Happy Mother's Day!!!

[timber715]

wala bang bagong update dito brader? namimiss ko na tong thread na to eh? 

[JojoD818]

wala bang bagong update dito brader? namimiss ko na tong thread na to eh? 

bago? madaming bago at magbabago brader... abangan na lang natin... 

[timber715]

bago? madaming bago at magbabago brader... abangan na lang natin... 

talaga brader  sige sige abangan ko yan 

[JojoD818]

talaga brader  sige sige abangan ko yan 

magbabago na ako ng size ng damit, sarap kasi kumain eh... lalu na sardinas na may sliced onions! 

magbabago na din ako ng cellphone, bwisit na N70 ito may text pala ako hindi man lang tumutunog! 

[ano ba maganda model ng Nokia na 10K and below lang? for text and call lang, bonus na kung may wi-fi  ]


abangan na lang natin brader yun ibang pagbabago na relevant sa JD Labs... 

[timber715]

magbabago na ako ng size ng damit, sarap kasi kumain eh... lalu na sardinas na may sliced onions! 

magbabago na din ako ng cellphone, bwisit na N70 ito may text pala ako hindi man lang tumutunog! 

[ano ba maganda model ng Nokia na 10K and below lang? for text and call lang, bonus na kung may wi-fi  ]


abangan na lang natin brader yun ibang pagbabago na relevant sa JD Labs... 

dati updated ako sa phone models ngayon models na lang  , ganun nga phone ko ngayon, 6600 fold, nalagyan yata ng varnish kaya ayun, di nagvibrate at di rin nagring kahit text tone wala 
sarap sardines no brader lalo na kung zaragosa 
may hint ba yang relevant changes sa JD labs? 

[JojoD818]

dati updated ako sa phone models ngayon models na lang  , ganun nga phone ko ngayon, 6600 fold, nalagyan yata ng varnish kaya ayun, di nagvibrate at di rin nagring kahit text tone wala 
sarap sardines no brader lalo na kung zaragosa 
may hint ba yang relevant changes sa JD labs? 

hahaha! pareho tayo, the last time I bought a cellphone was a 3660, then binigyan ako ng father-in-law ko ng N70 and yun na ever since ang gamit ko. kaso palagi nag hang, may text walang tunog, ilan beses ko na gusto ibato kaso naiisip ko biyenan ko eh. 

sarap brader, yan lunch namin ngayon eh 

naku wag na muna hint brader... baka maudlot pa 

[timber715]

sige abangabang muna...

[JojoD818]

sige abangabang muna...

tiyak naman makabubuti yun Brader... 


akalain mo may tumawag dito na dadating na yun mga gamit ko ng LS...

[timber715]

tiyak naman makabubuti yun Brader... 


akalain mo may tumawag dito na dadating na yun mga gamit ko ng LS...

LS ba kamo brader? woohooo...  teka, pahiram for test ha pag meron sample ha... pleeeeease 

[JojoD818]

LS ba kamo brader? woohooo...  teka, pahiram for test ha pag meron sample ha... pleeeeease 

sample? ayawko na brader! kalokohan yan sample sample na yan, ilan beses na ako gumagawa ng sample eh tapos hindi naman binabalik sa akin...