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Old 12th May 2010, 05:13 PM   #1
phrarod is offline phrarod  United States
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Default 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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Old 12th May 2010, 07:26 PM   #2
Stixx is offline Stixx  Germany
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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!
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Old 12th May 2010, 07:33 PM   #3
phrarod is offline phrarod  United States
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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.
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Old 12th May 2010, 07:48 PM   #4
Stixx is offline Stixx  Germany
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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 )
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Old 12th May 2010, 08:48 PM   #5
phrarod is offline phrarod  United States
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Thanks Stixx. Have you ever tried LED or diode tube bias on the cathode?
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Old 13th May 2010, 08:56 AM   #6
Stixx is offline Stixx  Germany
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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.
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