Topic: Newbie and Not-so Noob Thread: Questions (FAQ) on anything Tubes

[rascal101]

and also free to do as you please. 

rascal,

yun ek ek sa iyo na hindi mo nadidinig pwedeng nadidinig ng iba. your ears are not theirs, as theirs are not yours.

I don't agree na walang difference sa pandinig. I don't agree with putting tube buffers or modding anything inside (except maybe to replace the defective parts) inside the CDPs because I do not want to modify anything inside. External mods puwede sa akin.

[bumblebee]

External yata yung tube buffer na tinutukoy.

[s2kov]

ano nga ba?

[rascal101]

Dami kasing sa loob dumadale. Sayang naman iyun CDP kung ginalaw.

[ATJr.]

Dami kasing sa loob dumadale. Sayang naman iyun CDP kung ginalaw.

you are of course expressing your opinions right?
otherwise sa kinalang CDP yon.... and if it were me, it is not my bussiness to tell them what to do with with it. if they want to have it with tube buffers, by all means go for it. it's their money after all.

[JojoD818]

you are of course expressing your opinions right?
otherwise sa kinalang CDP yon.... and if it were me, it is not my bussiness to tell them what to do with with it. if they want to have it with tube buffers, by all means go for it. it's their money after all.

took the words right out of my mouth. 

[rascal101]

you are of course expressing your opinions right?
otherwise sa kinalang CDP yon.... and if it were me, it is not my bussiness to tell them what to do with with it. if they want to have it with tube buffers, by all means go for it. it's their money after all.

Yes. It is not my business what people want to do with their gears but it certainly voids any warranty if you do anything inside within the prescribed period. Correct? Also, you may no longer have the reference sound which you may want to compare over time. Unless mods comes with switches (rare).

The challenge to me is how to do produce the sound that you like without changing original designs of audio sources, pre-amps, amps and speakers and attacking the remaining weakest link(s) through science (not pseudo science) and engineering.

[JojoD818]

I bet that has been a challenge for other design engineers as well. And since people have different tastes, this shall still be a challenge for many years to come. 

What is pseudo science? That got me confused.

[rascal101]

Pseudo science - looks and sounds like science but is not; marketing hype

[JojoD818]

Pseudo science - looks and sounds like science but is not; marketing hype

Ah, just as I thought... that is probably the new branch of science called Magic. Now you see it, now you don't. 

[ATJr.]

i tend to be argumentative when i see there is a point that needs to be emphasized, otherwise if i feel my posting will not contribute anything of substance i'd rather keep quiet.....

[JojoD818]

excellent values indeed. 

[s2kov]

teke, teka......

nde na ko makasunod, ano na ba ang topic?

[JojoD818]

teke, teka......

nde na ko makasunod, ano na ba ang topic?

everything you always wanted to know about tubes but were afraid to ask...


tama ba senyor? 

[bumblebee]

Ask ko lang mga sirs.

resistor:

3K9=3.9K?
0R22=.22 Ohms?

[JojoD818]

Ask ko lang mga sirs.

resistor:

3K9=3.9K?
0R22=.22 Ohms?

correct po sir bumblebee.

[bumblebee]

Master JojoD, thanks

[markmlists]

Question to anyone who'd care to answer or would like to share an opinion....

Does the "like drive like" approach make sense or is wasteful? An example: if you have an EL34 why use a 12ax7/6922/6sn7 to drive it? Use another EL34 to drive an EL34, 2a3 to drive a 2a3, etc. May sense ba ito or sayang lang tubo?

Thanks.

[ATJr.]

Question to anyone who'd care to answer or would like to share an opinion....

Does the "like drive like" approach make sense or is wasteful? An example: if you have an EL34 why use a 12ax7/6922/6sn7 to drive it? Use another EL34 to drive an EL34, 2a3 to drive a 2a3, etc. May sense ba ito or sayang lang tubo?

Thanks.

there is only one way to find out....try it...

EL34 is not hard to drive compared to a 2A3 in terms of voltage swing at the grid...

[markmlists]

Thanks as usual sir. Im thinking of el84 narin. hehe

[maki_04]

 sir rene , how much wil u charge me if i ask u to assemble my marantz model 8 ? this kit has been with me since my father passed away. i used to hang out in ur place during the 80s wid tom c. & rey c.   Im now retired & thinking about audio again. BY the way do u still have my mags. cuz im about to send to you another vintage mags its Sams audio amplifiers.

[arnoldc]

Question to anyone who'd care to answer or would like to share an opinion....

Does the "like drive like" approach make sense or is wasteful? An example: if you have an EL34 why use a 12ax7/6922/6sn7 to drive it? Use another EL34 to drive an EL34, 2a3 to drive a 2a3, etc. May sense ba ito or sayang lang tubo?

Thanks.

because you need gain. an EL34 driving another EL34 will not give you the same gain as 6SN7 driving an EL34.

sad thing is we see 45 driving a 45 with an input transformer in front for gain. eh di nawala na din yung principle...

[markmlists]

Ah, I see. Thanks sir. Can it be done for purely power amp design lang? Gain provided by preamp? Thanks again!!

[arnoldc]

yes, we're talking of power amp. i'll make it simple-

6SN7 (Av=20) -> 2A3 (Av=4) - total Av (voltage gain, theoretical) = 80

2A3 (Av=4) -> 2A3 (Av=4) - total Av = 16

Ang layo di ba? You need a preamp that will provide Av = 64 to match that driven by 6SN7.

[markmlists]

Thanks and thanks.

[ATJr.]

2A3 (Av=4) -> 2A3 (Av=4) - total Av = 16

come to think of it, an input transformer with a turns ratio of 2 will make the total gain 32, not bad, specially since you will not be using negative feedback.

gains of 60 is handy if you intend to use negative feedback...the Dynaco ST70 has a gain of about 20 with feedback connected..

[arnoldc]

Tony, gawa mo ko transformer, gawa ako ng 2A3 drive 2A3, he he he

[s2kov]

OT:

kelan ang uwi nyo? nag start na si ferds sa amin since last week!

come to think of it, an input transformer with a turns ratio of 2 will make the total gain 32, not bad, specially since you will not be using negative feedback.

gains of 60 is handy if you intend to use negative feedback...the Dynaco ST70 has a gain of about 20 with feedback connected..

[ATJr.]

Tony, gawa mo ko transformer, gawa ako ng 2A3 drive 2A3, he he he

yeah, why not.....

[ATJr.]

OT:

kelan ang uwi nyo? nag start na si ferds sa amin since last week!

last week ng january...