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 Post subject: C3G HIFI-PREAMP
PostPosted: 15 Apr 2010, 22:41 
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Joined: 16 Mar 2010, 01:34
Posts: 9
i just found some of c3g,and buy all of them,its a great valve...but dont find a schematic to build a hifi preamp with this valves...somebody can help-me ? a hifi or line preamp c3g schematic?!?!?!?
lots of thanks.


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 16 Apr 2010, 01:48 
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Joined: 24 Feb 2009, 03:24
Posts: 562
Location: USA
http://www.jogis-roehrenbude.de/Leserbr ... A/RIAA.gif
You can use only first stage with plate interstage cap C2.
Attachment:
RIAA.gif


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_________________
Hi End is back proportional to the number of composite parts!
Projects: OTL 6AS7 Gen, Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, PP 6005 Gen. Ellectric , headphone ampl. OTL Loftin White 6AS7 RCA....SE E84L& E80CC Siemens&Tel-n.
http://azazello-sound.blogspot.com/


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 16 Apr 2010, 06:52 
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Joined: 16 Mar 2010, 01:34
Posts: 9
Many many thanks mister Azzello !!!
Greetz from Brazil!.


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 19 Apr 2010, 01:11 
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Joined: 16 Mar 2010, 01:34
Posts: 9
azazello wrote:
http://www.jogis-roehrenbude.de/Leserbriefe/Hans-Peter-Voelpel-C3G_RIAA/RIAA.gif
You can use only first stage with plate interstage cap C2.
Attachment:
RIAA.gif

thanks mr. azazello...but c5 and r3 are necessary ???or i can eliminate them? if i do this must conect the 4 pin to 3 pin ?

thanks.


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 19 Apr 2010, 01:21 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Hi,

cobalto777 wrote:
thanks mr. azazello...but c5 and r3 are necessary ???or i can eliminate them? if i do this must conect the 4 pin to 3 pin ?

First, if you triode the first tube, you destroy the equalization curve by changing the impedance and capacitance.

Secondly, you also cause Cmiller to come into play with the input, loading down the cartridge and messing with that... likely way too much capacitance, hence the cartridge will peak in the audible range and drop off far too soon.

Thirdly, you'll lose too much gain.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 19 Apr 2010, 01:31 
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Joined: 16 Mar 2010, 01:34
Posts: 9
cobalto777 wrote:
thanks mr. azazello...but c5 and r3 are necessary ???or i can eliminate them? if i do this must conect the 4 pin to 3 pin ?

Geek wrote:
First, if you triode the first tube, you destroy the equalization curve by changing the impedance and capacitance.

Secondly, you also cause Cmiller to come into play with the input, loading down the cartridge and messing with that... likely way too much capacitance, hence the cartridge will peak in the audible range and drop off far too soon.

Thirdly, you'll lose too much gain.

so..it's better if i dont change anything!!!even using just the first stage,interstage with c2???


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 19 Apr 2010, 02:05 
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Joined: 08 Aug 2009, 03:11
Posts: 2229
Location: Chilliwack, BC
Change nothing unless you're willing to change the frequency components... probably all of them as they interplay with each other.

It's a LOT of work to do that.

Cheers!

_________________
-= Gregg =-
* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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 Post subject: Re: C3G HIFI-PREAMP
PostPosted: 28 Apr 2010, 01:36 
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Joined: 16 Mar 2010, 01:34
Posts: 9
Geek wrote:
Change nothing unless you're willing to change the frequency components... probably all of them as they interplay with each other.

It's a LOT of work to do that.
ok people!!! this schematic works !!! sounds great!!!
many many thanks.
greetz from Brazil.


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