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6J1 preamp
6J1 preamp
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Old 11th February 2018, 09:30 PM   #11
Ketje is offline Ketje  Belgium
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Quote:
Originally Posted by adason View Post
Great, thanks Ketje, will test all.

I thought that R16 was only drawn incorrectly in the schematics, but in reality was ok. Will check that out.
If it's only in the schematic, no problem then.
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Well, i am already using two separate trafos, so i got that already on my own.
The two times 12V is not two trafos, simply a 24V with center tap.
Mona
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Old 12th February 2018, 12:40 PM   #12
adason is offline adason  United States
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Ketje, I understand perfectly what your picture shows...

I was describing what I did, not that any one cares. I use two separate adapters to power it. One 12 DC adapter just to power the heaters. One separate AC adapter to power the voltage multiplier. This way I can swap the AC adapter with increasing voltage, I use 18 volts AC now, giving me +/- 48volts volts for tubes. Sounds better this way, then measly +/- 28 volts.

I will be beefing up some filtration here and there, but otherwise I am almost done with it. No need to waste time on cheap project.
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Old 13th February 2018, 06:08 PM   #13
kodabmx is offline kodabmx  Canada
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Or you could use one of these and have dial-a-volt
DC-DC 8-32V to +-45V-390V Step-up ZVS High Voltage Capacitor Module Charge Board | eBay
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Old 14th February 2018, 02:17 AM   #14
adason is offline adason  United States
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Thanks for the suggestion kodabmx. Minor issue is that i have already replaced original caps rated 35 volts to new ones for 50 volts. Therefore i do not want to exceed 100 volts total right now.

Thanks anyway.
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Old 14th February 2018, 10:55 AM   #15
Ketje is offline Ketje  Belgium
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You can also get more voltage without an extra transfo.
Mona
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Old 12th May 2018, 08:18 AM   #16
tnvijay is offline tnvijay  India
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Quote:
Originally Posted by Ketje View Post
You'r not the first with problems with this circuit.
R16 to ground not -Vb !
Some sugestions to improve.
Mona
Hi Ketje,

I modofied this preamp to buffer. And its indeed very clean sounding and transpareny with almost unity gain..May you please explain whether this is functioning similar to 'The Harmonic Restorer' described in tubecad.com?
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Old 2nd June 2018, 06:32 AM   #17
gmcdonld is offline gmcdonld
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adason here is the fix for this preamp 6J1 China preamp thoughts
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