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6J1 China preamp thoughts
6J1 China preamp thoughts
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Old 17th January 2019, 02:42 AM   #111
aspringv is offline aspringv  Australia
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6J1 China preamp thoughts
I actually bought another two, with a view to trying a few extra mods like boosting the ac voltage, dropping in a 12V regulator on the heater, and popping a current source in instead of the resistor loading the tube.

No real reason to mind, just thought I'd give it a try and see if it sounds different, or measures differently.
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Old 17th January 2019, 03:10 AM   #112
e_fortier is offline e_fortier  Canada
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6J1 China preamp thoughts
Any noticed improvement with the 2 extra preamp ?

Little bit off context but where can I purchase these nice copper rings around the tubes ?

I donít even know how itís called so I can do a proper search on e-pay...

Thanks in advance
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As always - the last built gizmo is the very best
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Old 17th January 2019, 03:27 AM   #113
aspringv is offline aspringv  Australia
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6J1 China preamp thoughts
I've not gotten round to doing it to be honest!

I bought myself a cheapie laser engraver for christmas and I've been goofing around with that. I hope to be able to use it to etch pcbs and do more professional marking on frontpanels...
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Old 20th January 2019, 02:34 PM   #114
hifix is offline hifix  Australia
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Does anyone know how to reduce the gain from a fx audio tube 01 preamp ?
Its sounding quite nice, but i think (some say) its got 15db worth of gain. Anywhere from 6db to 0db would be nice.

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Old Yesterday, 09:07 PM   #115
bhpistorqintorpm is offline bhpistorqintorpm  India
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Default Another 6j1

I recently got this pre amp.
But on connecting in the chain there is a constant noise even at nil volume level from speakers.. noise sounds like radio turned on at high volume but without anything being played.

Unit comes with a dc wall socket- could this be power supply issue or the tubes issue!?

Pic of the board:
6J1 China preamp thoughts-img_20190120_112600-jpg

If it's to do with tubes then planning to get GE substitute and for powerfully issue, i have R core with regulated dc power supply which might need tweaking for that 12 volt input (at present output is at 15volts)

BHP=Torque X RPM : yeah i know, stuck to my automotive forum handle

Last edited by bhpistorqintorpm; Yesterday at 09:13 PM.
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