6j4+6p6 hifi preamplifier kit, improve sound quality significantly, easy to build, best choice for beginners!
The link
Price: Only $128 plus shipping
The link
An externally hosted image should be here but it was not working when we last tested it.
Price: Only $128 plus shipping
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Hi,
Can you give me more information on the 6j4+6p6p+6z5p HiFi Tube Preamplifier Kit? Do you have a BOM and information about distortion, noise, gain, volume control tracking, and power consumption?
Thanks.
Can you give me more information on the 6j4+6p6p+6z5p HiFi Tube Preamplifier Kit? Do you have a BOM and information about distortion, noise, gain, volume control tracking, and power consumption?
Thanks.
Hi CC43fan:
here's the schematic for your reference:
The performance is largely depend on how well it is built.
here's the schematic for your reference:
An externally hosted image should be here but it was not working when we last tested it.
The performance is largely depend on how well it is built.
Tested with our preamp:
The distortion is less than 0.6% from 100 to 10KHz
Power consumption is about 60W. The transformer is 100W.
SNR: 88dB
Gain: about 10dB. could be adjustable by change value of feedback resistor
The distortion is less than 0.6% from 100 to 10KHz
Power consumption is about 60W. The transformer is 100W.
SNR: 88dB
Gain: about 10dB. could be adjustable by change value of feedback resistor
No. they are different in shape and difference in electrical characters.
http://www.mif.pg.gda.pl/homepages/frank/sheets/095/6/6J4P.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/095/6/6J4.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/095/6/6J4P.pdf
http://www.mif.pg.gda.pl/homepages/frank/sheets/095/6/6J4.pdf
This is what I was referring to.... They sure look like the ones in the Kit...
6j4p, Tube 6j4p; Röhre 6j4p ID18935, Vacuum Pentode
6j4p, Tube 6j4p; Röhre 6j4p ID18935, Vacuum Pentode
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Hi Sled
It seems the one in your link is similar to the tube in the kit.
Do you have trouble in tracking your package? what did you order? If it's tube amplifier kit don't anticipate to receive them in less than 1 month for surface shipping. Surface shipping has very poor tracking system.
I got a dispute on paypal because the shipping is too slow. But there's no $50 way to throw 10kg to 5000km away in one week.
It seems the one in your link is similar to the tube in the kit.
Do you have trouble in tracking your package? what did you order? If it's tube amplifier kit don't anticipate to receive them in less than 1 month for surface shipping. Surface shipping has very poor tracking system.
I got a dispute on paypal because the shipping is too slow. But there's no $50 way to throw 10kg to 5000km away in one week.
siliconray,
I bought this amp and it is very good indeed!
The gain is a bit too high, which feedback resistors should I change and what are the values/ratings?
A value vs gain figures would be nice.
Thanks!
I bought this amp and it is very good indeed!
The gain is a bit too high, which feedback resistors should I change and what are the values/ratings?
A value vs gain figures would be nice.
Thanks!
Hi Jazzy, good to know that. Just change the 24k resistor to a lower value the gain will be reduced.
Hi Jazz, It would be nice if you can post some pics of your work, both inside and outside. Some beginners are struggling with the hum problem of the preamplifier. Your experience will be very helpful. Thanks!
Ok, I will do that soon. I am currently experimenting with the resistor's values to get the right gain. In the original configuration (24K resistors) if assuming 0 volume is at 7 o'clock position, just under 9 o'clock position it is already too loud for me!
FYI, I am using ROTEL RB-980BX as the power amplifier.
Sonically it is fantastic, the gain which in my opinion is too much at 10dB is making me losing 'proper' volume control.
How much lower resistance can I use? Right now I am at 10K, slightly better but I want to cut down further, possible to use 2k or 3K?
Thanks .
FYI, I am using ROTEL RB-980BX as the power amplifier.
Sonically it is fantastic, the gain which in my opinion is too much at 10dB is making me losing 'proper' volume control.
How much lower resistance can I use? Right now I am at 10K, slightly better but I want to cut down further, possible to use 2k or 3K?
Thanks .
what is your sound source? you may not need a preamp if using CD as source. Usually CD has 1.5Vp-p, high enough for most power amplifier. If you are using low level digital players (such as ipod) the preamplifier is usful.
You may reduce the feedback to 5.1k or even lower, until you get the comfortable gain. lower value is no harm to the performance.
You may reduce the feedback to 5.1k or even lower, until you get the comfortable gain. lower value is no harm to the performance.
Yes, that may be the reason as I an using a CDP.
I somehow found the sweet spot at 1.5K, since the CDP is my main source I shall stick to this for the time being.. have not tried other sources like tape deck, minidisc deck and a turntable(with separate phono preamp).
Thanks for the responses. Will upload few pics of the built.
Right now need to enjoy the music 😉
I somehow found the sweet spot at 1.5K, since the CDP is my main source I shall stick to this for the time being.. have not tried other sources like tape deck, minidisc deck and a turntable(with separate phono preamp).
Thanks for the responses. Will upload few pics of the built.
Right now need to enjoy the music 😉
Here's Mine...The PreAmp Sounds Great, right from the first Turn On. But, the Kit has some Real Issues...
An externally hosted image should be here but it was not working when we last tested it.
Hey Sled - nice build looks perfessioinal, what "real issues" do you see need to be addressed?
Cheers,
Bob
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