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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

6J1 Tube Preamplifier u$s35.
6J1 Tube Preamplifier u$s35.
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Old 16th April 2019, 12:43 AM   #1
santitrucco is offline santitrucco  Argentina
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Default 6J1 Tube Preamplifier u$s35.

Tube Preamplifier 6J1.

Hi , someone know how is the performance of this cheap preamplifier ?

Some time i listened that changing the tubes chinese 6J1 for 6AK5 or 5654 good quality tubes , the sound is good enough..

Is a good option for limited budget ?

Santiago
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Old 16th April 2019, 01:34 AM   #2
ICG is offline ICG  Germany
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Location: I had a Déjà Moo - I've seen that BS before!
I have a similar one, it's okay. It would profit from a higher anode voltage but you'd have to change a lot of the parts to do that though. The case is ugly but that's probably just my opinion but I'd take out the blue LEDs which illuminate the tubes. To do that you have to desolder the sockets, at least on mine it was.

The price is quite high though, the cheaper ones got the same parts tolerance and quality. You can get it with a really nice metal case for ~28$ or without case for 12$ (shipped from China).
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Old 16th April 2019, 01:57 AM   #3
avtech23 is offline avtech23  Australia
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6J1 Tube Preamplifier u$s35.
I've got one of these and it's good for what it is.

There is a mod here: 6J1 China preamp thoughts if you get hum.

I changed my tubes out for 5654GW and it is definitely an improvement.

Not the best preamp in the world but for the price, it is good to play with and experiment.
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Old 16th April 2019, 10:08 PM   #4
Andersonix is offline Andersonix  Sweden
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6J1 Tube Preamplifier u$s35.
Is this it? Tube buffer with 5532 output?
I kept a screen capture of the circuit as a reminder NOT to fall prey to its siren sounds.
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File Type: jpg Junk Tube buffer w 5532 output schematic.jpg (183.0 KB, 79 views)
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Old Today, 03:02 AM   #5
ICG is offline ICG  Germany
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Location: I had a Déjà Moo - I've seen that BS before!
Quote:
Originally Posted by Andersonix View Post
Is this it? Tube buffer with 5532 output?
I kept a screen capture of the circuit as a reminder NOT to fall prey to its siren sounds.
No, it's this preamp, it got no OPs or even transistors in the signal path, just the pentode tube wired as a triode.

tubepre.png
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