Author Topic: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)  (Read 11475 times)

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Offline silent_loud21

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baka may naka subok na tempting... :) pasok na pasok sa budget

https://www.lazada.com.ph/products/audio-mini-6j1-valve-vacuum-tube-pre-amplifier-stereo-hifi-buffer-preamp-dc12v-intl-i161712137-s197805690.html?spm=a2o4l.searchlist.list.9.61032ec6xwXmjJ&search=1

user review from lazada..
."Tube amps have been a popular audiophile gismo and became my life’s wish list the first time I heard it play on an audio shop I visited many years back.
But the jaw-dropping price kept it stuck on my dreams. This cheap brand exceeded my expectation when I paired it with my Onkyo stereo amp driving my current hungry Platinum Solo speaker.
I love listening to the warmth and subtle detail of this tube pre-amp even on a low volume. I finally found the missing link to my audiophile quest, in less the price."
« Last Edit: May 06, 2018 at 03:19 PM by silent_loud21 »

Offline CoolTOYZPH

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #1 on: May 06, 2018 at 03:55 PM »
12V pwede car audio 😁
Where is the Love? BEP

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #2 on: May 07, 2018 at 05:11 AM »
yes why not? that is basically a buffer with volume control,
not sure though about gain structure, have to see under the hood..
but again, at that price, a winner na.....:D
the caveat though is if the tube that came with it is microphonic,
but at 1800 pesos, who cares?

tube rolling hints.....https://www.aliexpress.com/item/New-American-GE-5654-tube-super-sound-substitution-6J1-6-m-1-6AK5-EF95-exact-matching/32798750888.html
« Last Edit: May 07, 2018 at 05:38 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline hennry sy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #3 on: May 07, 2018 at 09:36 AM »
^ panalo to at its pricepoint.  may voucher pa.  what is a microphonic tube sir tony?

Offline hennry sy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #4 on: May 07, 2018 at 09:40 AM »
can this be used as an electric guitar preamp kung babaguhin input and output jacks from rca to 6.3mm mono connector? tia

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #5 on: May 07, 2018 at 04:45 PM »
^ panalo to at its pricepoint.  may voucher pa.  what is a microphonic tube sir tony?

hissing, and making noise when the glass is tapped even lightly...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #7 on: May 08, 2018 at 08:09 AM »
can this be used as an electric guitar preamp kung babaguhin input and output jacks from rca to 6.3mm mono connector? tia

not sure that it has enough gain kung guitar pickup ang input, you will need at least 60db, the most we can expect here is 20db or less...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline JojoD818

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #8 on: May 08, 2018 at 08:34 AM »
this is reason the local diy scene is dying....https://www.ebay.com/itm/6J1-Valve-Pre-amp-Dual-Channel-Tube-Preamp-Preamplifier-Board-PCB-new-hot-/281902308485?var=&hash=item41a2afdc85:m:mKl8CtIIvJJDjo4lXhztSbQ

I beg to disagree. Kung ang goal lang is magkaroon then why not. Pero sa tunog, I won't expect much.

Offline JojoD818

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #9 on: May 08, 2018 at 08:37 AM »
yes why not? that is basically a buffer with volume control,
not sure though about gain structure, have to see under the hood..
but again, at that price, a winner na.....:D
the caveat though is if the tube that came with it is microphonic,
but at 1800 pesos, who cares?

tube rolling hints.....https://www.aliexpress.com/item/New-American-GE-5654-tube-super-sound-substitution-6J1-6-m-1-6AK5-EF95-exact-matching/32798750888.html


If that is indeed a buffer, usually configured as a parallel cathode follower then gain is automatically less than 1. Gain structure doesn't exist in a buffer and if that is the case then palamuti lang yan whose sole benefit in using is driving very long cables.

Offline hennry sy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #10 on: May 08, 2018 at 10:49 AM »
not sure that it has enough gain kung guitar pickup ang input, you will need at least 60db, the most we can expect here is 20db or less...

thanks, sir

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #11 on: May 08, 2018 at 11:39 AM »
thanks, sir

yes and as jojod said, just about 0db of gain...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #12 on: May 08, 2018 at 04:32 PM »
i spoke to soon....

found the schematics at diyaudio.com...

this preamp has gain after all, Av = 4700/(rk + 200) ohms, if rk = 200 ohms, then voltage gain is 11.75 or about 21.4db, i predicted 20db which is typical for most line preamps... 8)

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

Offline JojoD818

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #13 on: May 08, 2018 at 08:35 PM »
X10d psu.

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #14 on: May 09, 2018 at 04:50 AM »
my 6bc4 used the same topology, B+ of about 140 volts....this amp can use a better psu....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline dencio105

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #15 on: May 09, 2018 at 08:44 AM »
Speaking of tube amps available from Lazada how about this?:


https://www.lazada.com.ph/products/220v-350w-bluetooth-40-hi-fi-21-tube-amplifier-stereo-power-amp-usb-mic-remote-intl-i171831671-s214702233.html?spm=a2o4l.searchlist.list.48.3c485639vxdPsu&search=1

Is this better than say a Dared MP5? Or are there better alternatives in a similar price point?

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #16 on: May 09, 2018 at 03:15 PM »
same hybrids, tubes for line amps ang ss to drive speakers....
i can not make the same for that look and for that price....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline armymanhaha

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #17 on: May 14, 2018 at 04:58 PM »
nasubukan ko to. buti nalang may lazada return.

may channel imbalance yun sample na nakuha ko. tapos ang pangit tignan sa personal nung silver. go for black, and hopefully sana walang channel imbalance yung makuha nyo. it was nice sounding. Nabawasan ng details compared to volume control of my NAD M51 DAC pero mas naging palpable yung mga boses ng onti.
"Audiophools layuan nyo ako"

Offline dotnet

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #18 on: May 14, 2018 at 10:29 PM »
Any tips or mods so far with the 6j1? I bought the board with tubes without the casing at Lazada. Enjoying it!

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #19 on: May 15, 2018 at 06:19 AM »
live with it for while, if your are enjoying it, why change it?
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....


Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #21 on: May 16, 2018 at 06:40 AM »
DHT, direct heated tube? nah, this is a 6ak5 pentode wired as triode and is not a dht....

the 3A5 is a DHT, the tube with the highest mu of its class...

the CX01m CX26 are examples of DHT's...

can you tell me why you ask?
« Last Edit: May 16, 2018 at 06:52 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline dotnet

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #22 on: May 16, 2018 at 04:42 PM »
No, nothing in particular, just curious ::)  When the volume control of this preamp is cranked to the end, it distorts , so one has to keep it at a lower volume maybe only up a quarter. I'm am just using a wall wart I found in the garage at the moment since it did not come with one.

Offline dotnet

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #23 on: May 16, 2018 at 05:21 PM »
"this amp can use a better psu...." how do we propose to do this, sir?

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #24 on: May 16, 2018 at 06:06 PM »
No, nothing in particular, just curious ::)  When the volume control of this preamp is cranked to the end, it distorts , so one has to keep it at a lower volume maybe only up a quarter. I'm am just using a wall wart I found in the garage at the moment since it did not come with one.

that is called clipping distortion.....laws of physics at work...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #25 on: May 16, 2018 at 06:07 PM »
"this amp can use a better psu...." how do we propose to do this, sir?

did i wet your appetite?
a better psu will lead to a better design.....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....


Offline fredreadrick

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #27 on: May 18, 2018 at 05:47 PM »
i have owned this.... mine came with stock PSU.
upgraded the tubes to this, Voskhod 6J1P https://www.amazon.com/Voskhod-6J1P-EV-6ZH1P-EV-Matched-Pair/dp/B071H78DHZ
resulted in a noticeable improvements on SQ.
Ultimately, musicality—not dissecting the sound
—is what high-end audio is all about. - R. Harley

Offline tony

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

Offline dotnet

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #29 on: May 20, 2018 at 04:14 PM »
Changed the wall wart to a 12volt AC 1A transformer (Deeco=P180) already. No more distortion as well as lots more volume. For the sound quality I think, lesser foot tapping, lesser involvement, lesser teary-eyedness, I don't know why?