Will this circuit work?

G · 9th February 2007, 02:05 AM

Not sure but if it does it should have the benefits of Parafeed and Ultra path circuits. It certainly lowers the impedance that the AC signal sees.

http://smg.photobucket.com/albums/v2...eyparafeed.jpg

Geek · 9th February 2007, 08:44 AM

Hi,

Couple of oddities I see...

1) Souldn't C1 return to ground?
2) How can U1's plate have 150V and U2's grid have -24V when they're DC coupled?
3) R3 is shorted out.

Larry Lomax · 9th February 2007, 09:42 AM

I can't see why it should work.

jrevillug · 9th February 2007, 11:27 AM

Geek,

shout at me if I am wrong, but I would imagine that the Cathode of U2 is at 174 volts, so the grid is at a relative voltage of -24.

James

ray_moth · 9th February 2007, 11:28 AM

It looks as if it's been done in a hurry, without checking. It has errors and can't function as drawn.

G · 9th February 2007, 01:50 PM

Quote:

Originally posted by ray_moth
It looks as if it's been done in a hurry, without checking. It has errors and can't function as drawn.

Would you please clarify?

G · 9th February 2007, 02:12 PM

Quote:

Originally posted by Geek
Hi,

Couple of oddities I see...

Quote:

1) Souldn't C1 return to ground?

I don't think it has to though I may be wrong. That was my reason for posting it. I'm not sure.

Quote:

2) How can U1's plate have 150V and U2's grid have -24V when they're DC coupled?

The plate loading choke for U1 is dropping 10v and R2 is dropping 14v.

Quote:

3) R3 is shorted out.

Thanks. I missed that. I did indeed draw the diagram up in a hurry. I have corrected the diagram.

Dave Cigna · 9th February 2007, 09:01 PM

Should work like a charm and probably sound very good.

Just to make the drawing correct, I would get rid of the '-24V' by the grid and put '174V' by the cathode ...

-- Dave

kevinkr · 9th February 2007, 10:32 PM

I've a number of friends who have built a very similar design and I can't see any reason why this wouldn't work..

I would recommend trying an "ultrapath" cap between the bottom of the EXO-01 and the cathode resistor of the driver tube, other than that it looks fine.

ray_moth · 9th February 2007, 10:58 PM

Quote:

Would you please clarify?

R3 was shorted when I looked at the schematic before but it seems to have been corrected now.

There is no B+ for U1 - where is the 150v on its plate supposed to come from? And why is the same point in the circuit supposed to be at -24v on the grid of U2? Frankly, with errors like that, there could be other problems. I wouldn't trust the rest of the schematic.

9th February 2007, 02:05 AM	#1
G diyAudio Member Join Date: Apr 2002 Location: Belleville, IL.	Will this circuit work? Not sure but if it does it should have the benefits of Parafeed and Ultra path circuits. It certainly lowers the impedance that the AC signal sees. http://smg.photobucket.com/albums/v2...eyparafeed.jpg __________________ Gavin

9th February 2007, 09:42 AM	#3
Larry Lomax diyAudio Member Join Date: Feb 2005 Location: London Hammersmith	I can't see why it should work. __________________ Nothing happens by itself, you have to work hard to arrange things to make it happen.

9th February 2007, 10:32 PM	#9
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	I've a number of friends who have built a very similar design and I can't see any reason why this wouldn't work.. I would recommend trying an "ultrapath" cap between the bottom of the EXO-01 and the cathode resistor of the driver tube, other than that it looks fine. __________________ www.kta-hifi.net

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9th February 2007, 08:44 AM	#2
Geek diyAudio Member Join Date: Sep 2004	Hi, Couple of oddities I see... 1) Souldn't C1 return to ground? 2) How can U1's plate have 150V and U2's grid have -24V when they're DC coupled? 3) R3 is shorted out.

9th February 2007, 11:27 AM	#4
jrevillug diyAudio Member Join Date: Aug 2006	Geek, shout at me if I am wrong, but I would imagine that the Cathode of U2 is at 174 volts, so the grid is at a relative voltage of -24. James

9th February 2007, 11:28 AM	#5
ray_moth diyAudio Moderator Emeritus Join Date: Jan 2004 Location: Jakarta	It looks as if it's been done in a hurry, without checking. It has errors and can't function as drawn.

9th February 2007, 09:01 PM	#8
Dave Cigna diyAudio Member Join Date: Oct 2003 Location: Finger Lakes, NY	Should work like a charm and probably sound very good. Just to make the drawing correct, I would get rid of the '-24V' by the grid and put '174V' by the cathode ... -- Dave

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