Tony's 6H32 pre-amp

[tony]

Sir tony ok na ok yung mga collection mo ng vacuum tube amps at  pre amps mo. classic ang design pero durable naman warm ang sound at clear  lalo na pag bossa nova ang music masarap pakinggan yan . thumbs up for you!

thanks, if you have questions just ask here.....

[tony]

sir is it true n tube amps dont need tone controls? just the audio source, the tube amp andthe spkr only?

with tube amps i do not use tone controls....but there are reasons to use them, one is to compensate for room acoustics...but many do not find them necessary.....

the use of tone controls came about because at low listening levels, bass and treble outputs are also low, but as you increase volume, sound quality is not as good so that you will have to back off on the bass and treble controls....

[tony]

i'm trying to build tube tone control with baxandall filter using submini tube 6N16B to see if it will enhance more my tube amp. i'm happy listening to the amp with out tone concrol but i want to minimize the midrange area. minsan kasi me mga music na puro midrange na nakakarindi sa tainga....lalo a yung mga MP3 na di maganda pagka convert....kaya mostly gamit ko audio cd lang.

tone controls are built using high mu tubes because fo the gain requirements, using a lower mu tube might result in more distortions...but of course there is always a way to find that out....

[efren]

...build it

[fantom_mayonaise]

What phonostage you're using?

Nakatodo na ba?

For now, sa phono input muna ng integrated amp yung turntable. I'm still trying to decide between Rod Elliott's RIAA eq plus a tube preamp, or to a dedicated tube RIAA equalizer. I'm leaning towards Rod's eq to save on tube stages.

Matakaw sa space ang turntable

[Tukkar]

tone controls are built using high mu tubes because fo the gain requirements, using a lower mu tube might result in more distortions...but of course there is always a way to find that out....

ganun ba sir....me nakita kasi akong mga tone controls na ito ang gamit and then followed by line stage preamp to compensate for the attenuation loss and still produce about 2-5vrms of output signal...is this advisable?

[tony]

there is only one way to find out, build it.......it is not a question of voltage output....it is a question of gain, any device that runs out of gain tends to distort...

[Tukkar]

i'll try pero pag di maganda i shift ko na lang sa 6n9s...6sl7 analogous

[s2kov]

Try mo circuit ni Thorsten!

http://www.diyaudio.com/forums/analog-line-level/81575-analogue-addicts-phono-preamplifier-2006-edition.html

I have it together with my tube phonostage!

For now, sa phono input muna ng integrated amp yung turntable. I'm still trying to decide between Rod Elliott's RIAA eq plus a tube preamp, or to a dedicated tube RIAA equalizer. I'm leaning towards Rod's eq to save on tube stages.

Matakaw sa space ang turntable

[Tukkar]

there is only one way to find out, build it.......it is not a question of voltage output....it is a question of gain, any device that runs out of gain tends to distort...

6n16B has a gain of 25.. if I will make a Mu follower driving the tone control...what will be the effective gain at HT 0f 230V?

[tony]

the mu of a triode is an indication of voltage gain, remember that a triode has an internal resistance, therefore to maintain the amplification factor, the plate resistor needs to be infinite, so with the next stage grid resistor......

now in real life because the two other resistors ar finite, then the internal resistance of the triode decreases due to parallel connections and so amplification factor drops, the mu of 25 in practice can go as low as 10 in actual world...

even the 12ax7 with a mu of 100 can go as low as 50 with external components...

[Tukkar]

the mu of a triode is an indication of voltage gain, remember that a triode has an internal resistance, therefore to maintain the amplification factor, the plate resistor needs to be infinite, so with the next stage grid resistor......

now in real life because the two other resistors ar finite, then the internal resistance of the triode decreases due to parallel connections and so amplification factor drops, the mu of 25 in practice can go as low as 10 in actual world...

even the 12ax7 with a mu of 100 can go as low as 50 with external components...

that's very enlightening....sir thanks.....so if a mu follower preamp with this tube will not yield a gain of 25 but lesser and not as srpp that it will automatically halves the mu?

[tony]

a mu follower is a different story, http://audio.fam-gelder.nl/index.php/artikelen/31-alan-kimmels-mu-stage/55-why-use-the-kimmel-mu-stage.html

what i have explained is the common cathode tube amp....http://valvewizard1.webs.com/Common_Gain_Stage.pdf

[Tukkar]

i've already gone to those site sir...and already decided to use mu follower so that gain is higher which is more needed for a tone control...

i just want to try use this submini 2 triode tubes(6n16B) since they don't require sockets and easy to mount...