Author Topic: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)  (Read 11474 times)

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Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #30 on: May 20, 2018 at 06:53 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?

a 13 volt 1 amp traffo will be better imho, but you are probably hitting it already...
try different types of 6ak5's for tube rolling, look for Gerry Sta Maria, he can help you with tubes...09217430558
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 #31 on: May 20, 2018 at 09:09 PM »
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?

kulang sa lambing?  too clinical?  sa chip based amps yan din observation ko. ang linis, great sounding pero parang walang character, "lesser involvement" as you said.  same question, why?  why cant the china products now replicate even a fraction of japan made amps' character? if character is the word.

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #32 on: May 21, 2018 at 05:34 AM »
kulang sa lambing?  too clinical?  sa chip based amps yan din observation ko. ang linis, great sounding pero parang walang character, "lesser involvement" as you said.  same question, why?  why cant the china products now replicate even a fraction of japan made amps' character? if character is the word.


why? because to goal of the design is to sell cheap...

with those kinds of voltages? what to expect? tubes are run with voltages much higher than what was designed into that...

the 6j1/6ak5 unlike the 6dj8 are not that high transconductance...
i takes 4 to 5 plates to approach 6dj8 levels....
plate resistance is likewise high so output swing is low...

but, but, but, at 1800 pesos who is to complain? not me... :D
« Last Edit: May 29, 2018 at 05:43 AM by tony »
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Offline estaana

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #33 on: May 24, 2018 at 01:09 AM »
i got one of these the other day.  hooked it up along the signal chain, the immediate effect i heard generally is mild increase in middle frequencies - a nice change if i may say... no humming, the casing and physical build quality is ok, and it worked as advertised... for such an inexpensive tube gear!  ;D

others in the international audio forums advise to try replacing the stock tubes with GE5654W for maximum/optimized tube effect daw... but at the moment i-enjoy lang muna yung stock unit ;D

(P.S. my unit is connected to a linear regulated power supply).

Offline dotnet

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #34 on: May 27, 2018 at 01:18 PM »
a 13 volt 1 amp traffo will be better imho, but you are probably hitting it already...
try different types of 6ak5's for tube rolling, look for Gerry Sta Maria, he can help you with tubes...09217430558

Thanks, sir, but no reply from mr.gerry yet. And yes you're right, I tested it with a multitester and it says 13.36v AC.

Offline rascal101

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #35 on: May 28, 2018 at 11:05 AM »
Depende kung magkano amp na binebenta. Mga galing Tsina karamihan may pagka mura dahil mahirap kasi magbenta ng mahal lalo kung hindi kilala ang tatak. Pero meron din maganda talaga tumunog na may character din.

kulang sa lambing?  too clinical?  sa chip based amps yan din observation ko. ang linis, great sounding pero parang walang character, "lesser involvement" as you said.  same question, why?  why cant the china products now replicate even a fraction of japan made amps' character? if character is the word.

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #36 on: May 28, 2018 at 11:06 AM »
Thanks, sir, but no reply from mr.gerry yet. And yes you're right, I tested it with a multitester and it says 13.36v AC.

Gerry is also on facebook, you can catch him there also....https://www.facebook.com/gerry.stamaria.9
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 #37 on: May 28, 2018 at 04:28 PM »
Thanks! :) Do you think there is any slim chance changing the tubes could make it kinda sweet sounding again, sir? I already miss Eydie Gorme singing Sabor a mi ^-^

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #38 on: May 29, 2018 at 05:45 AM »
Thanks! :) Do you think there is any slim chance changing the tubes could make it kinda sweet sounding again, sir? I already miss Eydie Gorme singing Sabor a mi ^-^

don't pin your hopes too high....remember this is an el cheapo amp...
btw, i can lend you a pairs ot the 6ak5's...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline estaana

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #39 on: Jun 25, 2018 at 08:51 PM »
share ko lang po ... I upgraded the tubes to NOS GE JAN 5654W  (General Electric Joint ArmyNavy military spec/grade) I ordered from Riverstone Audio in USA... 

so I removed the stock 6J1 chinese made tubes...pagsalpak ko sa FX audio preamp,,, ayun o!  me improvement nga...mas lumutang ang instruments, voices,mas madetalye... parang mas improve ng konti ang bass .... halos same soundstage... overall mas "tube sounding" ito vs. using the stock tubes...

an inexpensive way to get "tube sound magic"   :)   
(used with a class D amp and famous diatone alnico fullrangers )

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #40 on: Jun 26, 2018 at 06:14 AM »
i have ordered mine and expecting delivery soon....
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline jerix

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #41 on: Jul 10, 2018 at 02:26 PM »
share ko lang po ... I upgraded the tubes to NOS GE JAN 5654W  (General Electric Joint ArmyNavy military spec/grade) I ordered from Riverstone Audio in USA... 

so I removed the stock 6J1 chinese made tubes...pagsalpak ko sa FX audio preamp,,, ayun o!  me improvement nga...mas lumutang ang instruments, voices,mas madetalye... parang mas improve ng konti ang bass .... halos same soundstage... overall mas "tube sounding" ito vs. using the stock tubes...

an inexpensive way to get "tube sound magic"   :)   
(used with a class D amp and famous diatone alnico fullrangers )

Bro how much is that replacement tube? is this 7pins also?
Samsung65MU6303/TCL4kPS49TV/OnkSR608/OnkTXNR676/Marantz/Akai/Sansui/PrjEssential-II

Offline estaana

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #42 on: Jul 10, 2018 at 08:23 PM »
Bro how much is that replacement tube? is this 7pins also?
Bro Php2,319 binayaran ko... thru Galleon Philippines,,,  cash on delivery....   pag sa lazada mas mahal yata ng 1k pesos ... yes its 7 pins... all they say in the international audio forums are true,,, that these GE tubes greatly improve the performance of this el cheapo tube preamp... I'm one happy user :-)

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #43 on: Jul 11, 2018 at 05:58 AM »
^meron ako nyan 1k for a pair....

6j1 preamp, i got mine for 765 pesos from lazada, and for power supply, i have 12 volt/1amp walwart, a JRC power brick from my old old old cellphone in the 90's....

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Offline JojoD818

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #44 on: Jul 11, 2018 at 11:37 AM »
12VAC?


Offline armymanhaha

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #46 on: Jul 25, 2018 at 08:20 AM »
^
I did. Walang detent para flat yung equalization. Very sensitive yung control nung bass and treble controls so onting galaw lang may difference agad.

Yung GE na 5654W tubes ba may difference yung may green print na version dun sa white print lang?
"Audiophools layuan nyo ako"

Offline jerix

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #47 on: Jul 29, 2018 at 12:09 AM »
^meron ako nyan 1k for a pair....

6j1 preamp, i got mine for 765 pesos from lazada, and for power supply, i have 12 volt/1amp walwart, a JRC power brick from my old old old cellphone in the 90's....



Kuya just sell it to me the replacement tube? Thanks
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Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #48 on: Jul 29, 2018 at 08:01 AM »
Kuya just sell it to me the replacement tube? Thanks

pm me your shipping details and i will send you a pair...any preference? american or japanese? these are 6ak5's...you can pay thru lbc...antonio tecson jr.
« Last Edit: Jul 29, 2018 at 08:03 AM 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: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #49 on: Aug 01, 2018 at 09:30 AM »
tubes shipped yesterday morning, you should be able to pick it up today...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline jerix

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #50 on: Aug 01, 2018 at 11:01 AM »
yup ill check it out after office hours. Salamat po!
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Offline qguy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #51 on: Sep 25, 2018 at 10:45 PM »
Finally ordered the one with the bass and treble controls. Will use this for my 2 channel HT system.

Offline DPT

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #52 on: Sep 25, 2018 at 10:54 PM »
I got something like that in the mail.

I should be powered by ac 12v 2 amp atleast for what it said.

It is only 450 pesos or around 8 usd.




Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #53 on: Sep 26, 2018 at 06:09 AM »
^it must be selling like hotcakes then Joffkevsky...
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline estaana

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #54 on: Sep 28, 2018 at 03:07 PM »
^
I did. Walang detent para flat yung equalization. Very sensitive yung control nung bass and treble controls so onting galaw lang may difference agad.

Yung GE na 5654W tubes ba may difference yung may green print na version dun sa white print lang?
i got the green print version from Riverstone Audio.
i don't know about the white printed ones...
but the green ones i think are the ones made for military grade...
the value add offered by Riverstone Audio is that they pre-selected matched pairs good for audio applications...

Offline qguy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #55 on: Oct 05, 2018 at 04:43 AM »
Been listening to this inexpensive pre-amp for the past couple of days and it is very good for the price. My initial plan was to use this for my 2 channel HT system.  The pre-amp got "promoted" and it is now on 2 channel audio duties.  It is now mated to a 205 WPC Parasound power amp driving Acarian Alon IV loudspeakers.

The only negative thing for me was that the potentiometer was too sensitive, I needed to reduce my power amp gain by 40 percent otherwise my max volume would be at the 9'oClock setting, with the reduced gain my b volume control can reach up to 12.
« Last Edit: Oct 05, 2018 at 04:45 AM by qguy »

Offline tony

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #56 on: Oct 05, 2018 at 05:40 AM »
this amp can be hacked for lower gains....if desired...just two resistors in parallel with the plate load resistors.....R15/R20, just solder in 4.7k metal film resistors to the existing ones, or replace them with 2.7k resistors lowers the gain of this line amp..



« Last Edit: Oct 05, 2018 at 06:04 AM by tony »
how do we defend our freedom? by the truth when it is assaulted by Marcos lies....

Offline qguy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #57 on: Oct 05, 2018 at 02:21 PM »
Thanks for the TIP, when I get enough courage, will operate on this amp :)


this amp can be hacked for lower gains....if desired...just two resistors in parallel with the plate load resistors.....R15/R20, just solder in 4.7k metal film resistors to the existing ones, or replace them with 2.7k resistors lowers the gain of this line amp..





Offline estaana

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #58 on: Oct 05, 2018 at 11:18 PM »
Had a positive user experience with the audio mini 6J1 tube preamp  - mine is FX Audio Tube 01 I replaced with GE JAN 5654W tubes from Riverstone Audio. 

Today i saw in Lazada they offer FX Audio Tube P1... single ended tube amplifier with 2watt+2watt power output.... hmmmm...  ;D

https://www.lazada.com.ph/products/fx-audio-tube-p1-6j1-6p1-hifi-mcu-single-ended-classic-a-desktop-power-tube-amplifier-headphone-amplifier-rcaphono-input-i261737726-s361530932.html?spm=a2o4l.searchlist.list.45.fcae5639q8e9dF&search=1

meron na ba sa inyo mga Sir naka-try nito? I'd like to know your feedbacks/reviews sana... if ever, i'm planning to pair this with high sensitive fullrange speaker (for listening to mostly jazz music)...

Offline qguy

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Re: Audio Mini 6J1 Valve & Vacuum Tube Pre-Amplifier(@lazada)
« Reply #59 on: Oct 06, 2018 at 01:45 AM »
What is the sensitivity of your speakers ?

Had a positive user experience with the audio mini 6J1 tube preamp  - mine is FX Audio Tube 01 I replaced with GE JAN 5654W tubes from Riverstone Audio. 

Today i saw in Lazada they offer FX Audio Tube P1... single ended tube amplifier with 2watt+2watt power output.... hmmmm...  ;D

https://www.lazada.com.ph/products/fx-audio-tube-p1-6j1-6p1-hifi-mcu-single-ended-classic-a-desktop-power-tube-amplifier-headphone-amplifier-rcaphono-input-i261737726-s361530932.html?spm=a2o4l.searchlist.list.45.fcae5639q8e9dF&search=1

meron na ba sa inyo mga Sir naka-try nito? I'd like to know your feedbacks/reviews sana... if ever, i'm planning to pair this with high sensitive fullrange speaker (for listening to mostly jazz music)...