Author Topic: Transformer Volume Control Preamp (Passive)  (Read 13552 times)

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Offline innocent

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Transformer Volume Control Preamp (Passive)
« on: Sep 05, 2015 at 06:37 PM »
Is there anybody who knows the effects of this transformer volume control preamp to low wattage single ended triode amp such as 6bm8?  What I understand is that, it increases the db of the input and output.  So it may increase attack to my 100db speakers.  It's what I need for now to improve performance of my 6bm8 SET. Is my speculation correct?  Kindly enlightened me.

If there anybody who can locally manufacture this TVC?  How much?  Thank you. :)
« Last Edit: Sep 05, 2015 at 06:38 PM by innocent »
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Offline AAudio

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Re: Transformer Volume Control Preamp (Passive)
« Reply #1 on: Jan 03, 2016 at 12:07 AM »

you may want to ask around for mang Rod Teope, He makes TVC preamp and tube amp as well.
i have his number in my old fone before...

Offline JojoD818

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Re: Transformer Volume Control Preamp (Passive)
« Reply #2 on: Jan 03, 2016 at 01:23 AM »
Is there anybody who knows the effects of this transformer volume control preamp to low wattage single ended triode amp such as 6bm8? 

I'm not sure what you are expecting but a TVC attenuates the input signal by stepping it down, the amount of attenuation is selected by selecting different taps in the secondary of the transformer. The truth of the matter is that with TVCs, the output impedance changes as you change taps as opposed to the manner employed by all resistive potentiometers that creates a voltage divider between the input and the output and presents a constant impedance across the entire adjustment range.

Quote
What I understand is that, it increases the db of the input and output. 

It does not.

In fact, it does quite the opposite. Being a step-down transformer, the attenuation is accomplished by varying the ratio of the primary versus the secondary windings, however, this is not practical so to be able to choose different attenuation levels, one must use a "stepped" rotary switch and choose the appropriate tap that corresponds to the desired signal attenuation level.

Quote
So it may increase attack to my 100db speakers.  It's what I need for now to improve performance of my 6bm8 SET.


I doubt it. No type of volume control nor preamp can do that to an amp, especially to a tube amp. Most tube amps are "lazy" risers, for they tend to compress the signal and prevent distortion. This is, for what it's worth, is sometimes what is sought after from them. But for your predicament, perhaps a further study of the input section of your amp and stiffening your psu can improve the "attack" you are referring to but at the expense of compression and distortion.

You change one thing for the sake of another thing applies here.

Quote
Is my speculation correct?  Kindly enlightened me.

I hope I didn't lost you up there, it can be quite technical and I was trying to be as objective as I can in my response rather than be subjective.

Quote
If there anybody who can locally manufacture this TVC?  How much?  Thank you. :)

I am not aware of such but, IMHO, you may want to reconsider, the reason these TVCs, and moving coil SUTs are priced like that is because of the materials required and the strict tolerance that they must go through during manufacturing. You get what you pay for in this department.

Anyway, you may want to take that last paragraph with a grain of salt.


Offline JoeyGS

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Re: Transformer Volume Control Preamp (Passive)
« Reply #3 on: Jan 04, 2016 at 11:10 AM »
I agree with JojoD.

But before jumping into another system component,  see if there is a mismatch between your preamp output and your power amp input.  Try borrowing a tubed buffer (aka, MF X-10D) and connect between your preamp and poweramp.  See or rather hear what happens......

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #4 on: Jan 04, 2016 at 11:20 AM »
Quote
If there anybody who can locally manufacture this TVC?  How much?  Thank you. :)

Mang Rod s the guy.....;)

if I many ad to what jojod has said, TVC is a passive device, attenuates the signal much like a volume pot...
it has insertion loss and impedance is not uniform with frequency.....Z= 2pifL....
where Z is the impedance, f is frequency and L is inductance of the coils...
it can be made as an isolation type or autotransformer type....

best to use this TVS between a power amp and a preamp if used....
« Last Edit: Jan 04, 2016 at 11:27 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline JojoD818

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Re: Transformer Volume Control Preamp (Passive)
« Reply #5 on: Jan 04, 2016 at 06:18 PM »
Spot on. And like I said, the impedance varies wildly which, may, or may not, be a match to the preceding stage.

It is common for tube amps to have 470K-ish and above whist a modern Class D amp has a typical input impedance of 10K. So be guided accordingly to prevent a mismatch.

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #6 on: Jan 05, 2016 at 07:35 AM »
i tried to convince the owner of Golden Mars to make the TVC's offering to give them my design, but no deal...;)
i figured years ago that i am not making this TVC, it will be very costly and difficult to make....
but those who are interested to make one, you can ask Rey Lus to make one for you....09332235765
i can give him my coil winding data.....Rey Luis is the official traffo winder for Rene Rivo....
or you can also ask Boy Pangilinan of Deeco...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #7 on: Mar 09, 2016 at 07:15 AM »
any one? i talked to Rey Luis a couple of months ago, about 3k for a pair is my estimate...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline ndotcom

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Re: Transformer Volume Control Preamp (Passive)
« Reply #8 on: Mar 09, 2016 at 02:29 PM »
any one? i talked to Rey Luis a couple of months ago, about 3k for a pair is my estimate...

Sir Tony pano config or wiring neto? Ilang taps para malaman kung ilan switch/selector kailangan? Si mang Rey gawa pala kaya pulido rin yan.

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #9 on: Mar 09, 2016 at 02:52 PM »
Sir Tony pano config or wiring neto? Ilang taps para malaman kung ilan switch/selector kailangan? Si mang Rey gawa pala kaya pulido rin yan.

this is just a continuous winding with several taps, the number of taps
depends on the rotary switch you want to use, anywhere between six to 24 position will do...
in all honesty, i made several attempts to make this, pero palagi akong napuputulan ng wire,
tinigilan ko....pasmado kasi kamay ko...
btw, i was on the phone with mang rey this morning, he says he is good to go
with this, i can guide him with this build, no problem....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #10 on: Mar 15, 2016 at 11:15 AM »
mang rey luis is making his first attemp of this TVC......soon he will be accepting orders if it will be successful :)
« Last Edit: Mar 15, 2016 at 11:16 AM by remington »
tube + audio nirvana = beyond...

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #11 on: Jun 11, 2016 at 11:11 AM »
Mang rey just finished his first tvc. Maganda pala talaga ito nag improve dramatically ang system ko burning period palang ayos na ano pa kayang surprises ilalabas nito >:D...feeling hexited ^-^
« Last Edit: Jun 11, 2016 at 11:12 AM by remington »
tube + audio nirvana = beyond...

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #12 on: Jun 11, 2016 at 01:39 PM »
my design has been validated..... we were in constant communication with mang Rey Luis
......no burning period with this one, just use this tvc and enjoy.......
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline innocent

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Re: Transformer Volume Control Preamp (Passive)
« Reply #13 on: Jun 14, 2016 at 03:30 PM »
Mang rey just finished his first tvc. Maganda pala talaga ito nag improve dramatically ang system ko burning period palang ayos na ano pa kayang surprises ilalabas nito >:D...feeling hexited ^-^
Congrats to you bro!  Im glad you have a TVC preamp similar to this TVC SQ.

http://www.tnt-audio.com/ampli/django_e.html

So expensive!  At least kay Mang Rey mura at same SQ lang din naman.  I also found out that tvc quality depends on tranny design.
« Last Edit: Jun 14, 2016 at 03:38 PM by innocent »
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Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #14 on: Jun 14, 2016 at 06:15 PM »
mang rod teope also makes tvc's....he was first to make these several years ago, rey luis is the second person to make one....
« Last Edit: Jun 15, 2016 at 11:18 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #15 on: Jun 15, 2016 at 07:46 AM »
Congrats to you bro!  Im glad you have a TVC preamp similar to this TVC SQ.

http://www.tnt-audio.com/ampli/django_e.html

So expensive!  At least kay Mang Rey mura at same SQ lang din naman.  I also found out that tvc quality depends on tranny design.

thanks bro! dead silent din ito. very happy camper here!
tube + audio nirvana = beyond...

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #16 on: Jun 15, 2016 at 11:19 AM »
thanks bro! dead silent din ito. very happy camper here!

that is a passive devise, silence is to be expected, it is but natural...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #17 on: Jun 15, 2016 at 03:48 PM »
panganay ni mang rey ;D >:D >:D >:D





« Last Edit: Jun 15, 2016 at 03:49 PM by remington »
tube + audio nirvana = beyond...

Offline dana

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Re: Transformer Volume Control Preamp (Passive)
« Reply #18 on: Jun 15, 2016 at 03:59 PM »
jun,may hot thread pektyur ka ba jan..
patingin ng nude shots ;D...

Offline CoolTOYZPH

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Re: Transformer Volume Control Preamp (Passive)
« Reply #19 on: Jun 15, 2016 at 04:03 PM »
Mag Rey really has the "ears" to make Audio equipment.
Congratulations!

Mang rey just finished his first tvc. Maganda pala talaga ito nag improve dramatically ang system ko burning period palang ayos na ano pa kayang surprises ilalabas nito >:D...feeling hexited ^-^
Where is the Love? BEP

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #20 on: Jun 15, 2016 at 04:17 PM »
jun,may hot thread pektyur ka ba jan..
patingin ng nude shots ;D...
]wala pa ko nude shots sir kuhaan ko pag binuksan ko ulit.

Mag Rey really has the "ears" to make Audio equipment.
Congratulations!

thanks sir!
tube + audio nirvana = beyond...

Offline innocent

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Re: Transformer Volume Control Preamp (Passive)
« Reply #21 on: Jun 15, 2016 at 04:22 PM »
jun,may hot thread pektyur ka ba jan..
patingin ng nude shots ;D...
Nude? Baka ma censor tayo niyan?  ;D
Customized audio gears  satisfies.

Offline ndotcom

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Re: Transformer Volume Control Preamp (Passive)
« Reply #22 on: Jun 15, 2016 at 04:24 PM »




Sir bat parang andami RCA sa likod? Ilan ins at out sya? Ilan steps attenuation din?

More details sana if possible. Thanks

Offline remington

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Re: Transformer Volume Control Preamp (Passive)
« Reply #23 on: Jun 15, 2016 at 04:44 PM »
2 input 2 output 22 steps attenuaton sir
tube + audio nirvana = beyond...

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #24 on: Jun 15, 2016 at 07:19 PM »
Sir bat parang andami RCA sa likod? Ilan ins at out sya? Ilan steps attenuation din?

More details sana if possible. Thanks

Norman, eto ang pinagmulan nyan.....http://www.diyaudio.com/forums/tubes-valves/51391-poor-mans-transformer-volume-control.html

pwede naman lagyan ng input selector so you can choose two or more line amps or sources,
pwede rin lagyan ng buffer bago TVC.....maraming pwedeng gawin....
meron akong niluluto, isolation type, pwede gawing balanced outputs...
mag-uusap pa kami ni Rey Luis...


how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #25 on: Jun 15, 2016 at 07:21 PM »
jun,may hot thread pektyur ka ba jan..
patingin ng nude shots ;D...

wala namang masyadong makikita sa loob...pagawa ka na, wala ka pan nyan, better kung yung coil former ni Edrel at yung Z11 na bakal nya ang gagamitin....;) we do not have nickel laminates here so GOSS is good enough.....

for those wanting to build this TVC is the schematic:
« Last Edit: Jun 16, 2016 at 04:52 PM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #26 on: Jun 16, 2016 at 04:56 PM »
was at DEECO this noon, and guess who i bumped into? no other than the builder of this TVC....
Ronald DeJesus, he was the diy'er who put this thing together, he built a yellow ST70 that was
able to drive electrostatic speakers....

i met Ronald in 2010 in december in dampalit , malabon, we were co-judges in a music exhibition...

so now it can be told, Ronald DeJesus, tvc builder,
Rey Luis, winder of the tvc traffo....
and Tony Tecson designed this tvc.....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline dana

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Re: Transformer Volume Control Preamp (Passive)
« Reply #27 on: Jun 16, 2016 at 05:51 PM »
wala namang masyadong makikita sa loob...pagawa ka na, wala ka pan nyan, better kung yung coil former ni Edrel at yung Z11 na bakal nya ang gagamitin....;) we do not have nickel laminates here so GOSS is good enough.....

for those wanting to build this TVC is the schematic:


any one? i talked to Rey Luis a couple of months ago, about 3k for a pair is my estimate...

how muchos gracias..price kaya?

Offline tony

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Re: Transformer Volume Control Preamp (Passive)
« Reply #28 on: Jun 17, 2016 at 06:34 AM »
how muchos gracias..price kaya?


ikaw pa? yakang yaka, if you can convince Edrel to wind a pair for you,
Edrel have z11 cores that will ensure about 3 times more inductance
for a better low frequency handling....pay him a visit...
switches are available here.....http://www.mableaudio.com/en/productview-817.html

how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline dana

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Re: Transformer Volume Control Preamp (Passive)
« Reply #29 on: Jun 17, 2016 at 09:30 AM »
papaT , tineks ko na si Edrelski...
sabi ko mag wind sya ng madami mdami,  for pdvd Diyers ;D