srpp 6c33c

adharvey · 23rd January 2006, 01:05 PM

Has anyone ever tried a 6c33 srpp otl output stage, I was thinking driven by a 6c45pi?

Any suggestions / considerations?

How would it sound?

Thanks

316a · 23rd January 2006, 10:37 PM

Hi ,
Already tried that . Used the lower 6C33 fixed bias with the top stage setting around 230mA . The chassis was big , ugly , hot and I had to build an outboard supply . B+ was 390V and both channels plus the driver pulled a total of 500mA . I used 7N7 input stage with 2c50 driver , both with active loads . Sounded good at low volumes only though !

cheers

316a

pat49hk · 29th January 2006, 12:17 AM

Dear adharvey and 316a,

May I study your circuit?

Thanks

fdegrove · 29th January 2006, 02:46 AM

Hi,

The gain of the SRPP using a pair of 6C33-Cs is nothing worth talking about and you don't need it anyway.

In order to properly drive a speaker you need to consider Zout and the capability of the stage to deliver current.

So why not use a White Cathode Follower topology to kill two birds with one stone?

Cheers,

23rd January 2006, 01:05 PM	#1
adharvey diyAudio Member Join Date: May 2003 Location: Thursday Island, Torres Strait (still Queensland), Australia	srpp 6c33c Has anyone ever tried a 6c33 srpp otl output stage, I was thinking driven by a 6c45pi? Any suggestions / considerations? How would it sound? Thanks

29th January 2006, 02:46 AM	#4
fdegrove diyAudio Senior Member Join Date: Aug 2002 Location: Belgium	Hi, The gain of the SRPP using a pair of 6C33-Cs is nothing worth talking about and you don't need it anyway. In order to properly drive a speaker you need to consider Zout and the capability of the stage to deliver current. So why not use a White Cathode Follower topology to kill two birds with one stone? Cheers, __________________ Frank

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23rd January 2006, 10:37 PM	#2
316a diyAudio Member Join Date: Dec 2002 Location: West London	Hi , Already tried that . Used the lower 6C33 fixed bias with the top stage setting around 230mA . The chassis was big , ugly , hot and I had to build an outboard supply . B+ was 390V and both channels plus the driver pulled a total of 500mA . I used 7N7 input stage with 2c50 driver , both with active loads . Sounded good at low volumes only though ! cheers 316a

29th January 2006, 12:17 AM	#3
pat49hk diyAudio Member Join Date: Sep 2005	Dear adharvey and 316a, May I study your circuit? Thanks

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