Want to build a C3G linestage

phrarod · 12th May 2010, 04:13 PM

I saw in the archives some have built phono stages and a headphone amp. I would like to build a simple linestage and wondering what experience people have had with the C3G and if they would be willing to share any circuits?

Stixx · 12th May 2010, 06:26 PM

You could basically a linestage as in the schematic linked...

http://www.jogis-roehrenbude.de/Lese...ns-C3g/c3g.gif

just put in a smaller coupling cap (1-4.7uF).

I built the schematic as a headphone amplifier

Kopfhoerer-Amp_C3g, von Oliver Stick

with a few mods and a different psu, and it sounds very good. The C3g has very good resolution, dynamics and very sweet highs!

phrarod · 12th May 2010, 06:33 PM

Stixx. I was hoping you would post. First link doesn't work though.

I'm quite excited about this tube from what I read. Do you think its a candidate for transformer output? Anything you learned when you built yours? Much appreciated.

Stixx · 12th May 2010, 06:48 PM

Pharod, it should be well suited for transformer output, like a 5K:600.
In fact I recently built another C3G headphone amp with vintage Saba output transformers and regulated supplies, but it doesn't (yet) have the magic of the cap coupled one.
It just lacks part of the bottom and also still has some hiss, just didn't have the time and money to go for better opt's...

When I built the first one (the one in the second link) it sounded okay but not overwhelming... I then converted the entire psu to MKP capacitors and used Sanyo Os-con in the cathode (2 x 220uF 16V). This transformed the sonics in quite an amazing way... it is still one of my favourites.
Output caps are Siemens MKV and highly recommended, you can still find them on Epay from time to time (german bay

)

phrarod · 12th May 2010, 07:48 PM

Thanks Stixx. Have you ever tried LED or diode tube bias on the cathode?

Stixx · 13th May 2010, 07:56 AM

Quote:

Have you ever tried LED or diode tube bias on the cathode?

No, not with the C3G. I've tried it in another headphone amp (ECC88 based Morgan Jones) and it worked very well. It always depends what you (personally) like best in terms of sound... and it's very easy to try.

12th May 2010, 04:13 PM	#1
phrarod diyAudio Member Join Date: Aug 2005	Want to build a C3G linestage I saw in the archives some have built phono stages and a headphone amp. I would like to build a simple linestage and wondering what experience people have had with the C3G and if they would be willing to share any circuits?

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12th May 2010, 06:26 PM	#2
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	You could basically a linestage as in the schematic linked... http://www.jogis-roehrenbude.de/Lese...ns-C3g/c3g.gif just put in a smaller coupling cap (1-4.7uF). I built the schematic as a headphone amplifier Kopfhoerer-Amp_C3g, von Oliver Stick with a few mods and a different psu, and it sounds very good. The C3g has very good resolution, dynamics and very sweet highs!

12th May 2010, 06:33 PM	#3
phrarod diyAudio Member Join Date: Aug 2005	Stixx. I was hoping you would post. First link doesn't work though. I'm quite excited about this tube from what I read. Do you think its a candidate for transformer output? Anything you learned when you built yours? Much appreciated.

12th May 2010, 06:48 PM	#4
Stixx diyAudio Member Join Date: Sep 2003 Location: Southern Germany	Pharod, it should be well suited for transformer output, like a 5K:600. In fact I recently built another C3G headphone amp with vintage Saba output transformers and regulated supplies, but it doesn't (yet) have the magic of the cap coupled one. It just lacks part of the bottom and also still has some hiss, just didn't have the time and money to go for better opt's... When I built the first one (the one in the second link) it sounded okay but not overwhelming... I then converted the entire psu to MKP capacitors and used Sanyo Os-con in the cathode (2 x 220uF 16V). This transformed the sonics in quite an amazing way... it is still one of my favourites. Output caps are Siemens MKV and highly recommended, you can still find them on Epay from time to time (german bay )

12th May 2010, 07:48 PM	#5
phrarod diyAudio Member Join Date: Aug 2005	Thanks Stixx. Have you ever tried LED or diode tube bias on the cathode?

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