diyAudio

diyAudio (http://www.diyaudio.com/forums/)
-   Tubes / Valves (http://www.diyaudio.com/forums/tubes-valves/)
-   -   Stereo Buffer with a single twin triode (http://www.diyaudio.com/forums/tubes-valves/138089-stereo-buffer-single-twin-triode.html)

Brit01 7th February 2009 12:05 AM

Stereo Buffer with a single twin triode
 
2 Attachment(s)
I'm looking to build a stereo buffer amp but possibly with just 1 twin triode such as a 6N6P.

I heard that crosstalk is not really an issue so I would like to see if I can use 1 triode to handle the left and right signals.
Input source will be a standard CDP and the buffer will be used with a SS power amp.

CDP>Buffer>Power amp.

Simple self bias cathode follower is on my mind here. But how to design this with the left and right signals is puzzling me a little. Please take a look and let me know.

leadbelly 7th February 2009 01:38 AM

Wow, that circuit is mouth watering...TWO caps in the signal path...for a buffer preamp that's rarely needed nowadays...you had me at "Hello" :D

Maybe try this page http://www.lampizator.eu/UPGRADE/upg...to%206H6P.html and this circuit http://www.lampizator.eu/UPGRADE/new%20CF%206H6P.mdi

IMHO if you going to build this at least put a CCS in place of the cathode resistor.

SY 7th February 2009 02:09 AM

Quote:

But how to design this with the left and right signals is puzzling me a little.
Judging from the schematic, you don't seem puzzled.

Eli Duttman 7th February 2009 02:25 AM

You can eliminate the caps. on the I/P side, if you use a bipolar PSU.

Constant current sink (CCS) loading is an excellent idea. While a SS cascode or pentode is "best", even the comparatively simple 10M45S will be better than a resistive load.

I agree with SY, in that your schematic makes sense. What is it about stereo that's got you worried?

Brit01 7th February 2009 01:17 PM

Quote:

Wow, that circuit is mouth watering...TWO caps in the signal path...for a buffer preamp that's rarely needed nowadays...you had me at "Hello"
Had a feeling that leadbelly would chime in first. Lol
Yes I wasn't sure about the caps.

What software did you open this with?



Quote:

IMHO if you going to build this at least put a CCS in place of the cathode resistor
I need to look into this as I'm not too familiar with CCS. Any references to circuit ideas would be great.

Quote:

I agree with SY, in that your schematic makes sense. What is it about stereo that's got you worried?
Most of the designs seem to use 2 separate tubes, one for each channel. If there is no crosstalk involved I'd like to use the 2 triodes in one tube.
Do I need a twin triode with a screen to implement this design? The article that leadbelly included states there are 2 types of 6N6P.

SY 7th February 2009 01:36 PM

Quote:

I need to look into this as I'm not too familiar with CCS. Any references to circuit ideas would be great.
Here's one:

http://syclotron.com/?page_id=8

Brit01 7th February 2009 02:13 PM

Thks Sy.


But I'm trying to keep the circuit as simple as possible without sacrificing performance too much.
This is getting a little too complicated.

SY 7th February 2009 02:37 PM

My solution was a bit complicated, but the CCS use was what I wanted you to see. You could use an input cap in place of my transformer coupling if you want to keep a single supply.

poynton 7th February 2009 02:39 PM

2 Attachment(s)
Here is a similar circuit ( with obvious mistakes !! )

Uses a CCS in the cathode

(available from Ebay seller Audiotek *** - a wellknown scammer)


Andy

Brit01 7th February 2009 02:41 PM

Just released that was your web site and designs!:xeye:

Bit slow on the take up this morning.:rolleyes:

Nice work Sy.


All times are GMT. The time now is 06:21 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio


Content Relevant URLs by vBSEO 3.3.2