Double parafeed

MrCurwen · 08:20 PM

I'm fooling around with some thought of parafeed, but alas I am a poor man, therefore I don't usually build a whole new amp unless I'm fairly certain it'll sound good. Or at least work at all.

I'm wondering would it be possible to have two (2) outputs from a parafeed power stage. To clarify: one tube, cathode biased (/w LEDs), choke on anode, two 4.7µF Solen caps from anode of tube, one transformer between each cap and ground (or cathode).

The other transformer would be say 5K : 4R, to drive a bass cone speaker, the other a P-P transformer in reverse, 4R : 10K to drive an ESL tweeter.

Probably not the most elegant or otherwise best system, but if this would work it'd be very cheap!

Any thoughts?

Gluca · 25th October 2011, 08:49 PM

No, the tube would see a very low impedance (4R from the ESL tweeter).

MrCurwen · 25th October 2011, 08:58 PM

The impedance reflected by a transformer depend on what is on the other side - the ESL panel is basically an open circuit, a capacitor. In reality it however has a very high impedance or so I've understood. Therefore it would reflect much more than 4R to the other side of the transformer.

Has it been done? Can you put a low impedance primary in a parafeed circuit with an ESL panel on the other side?

Frank Berry · 09:15 PM

No.

25th October 2011, 08:17 PM	#1
MrCurwen diyAudio Member Join Date: Feb 2010	Double parafeed I'm fooling around with some thought of parafeed, but alas I am a poor man, therefore I don't usually build a whole new amp unless I'm fairly certain it'll sound good. Or at least work at all. I'm wondering would it be possible to have two (2) outputs from a parafeed power stage. To clarify: one tube, cathode biased (/w LEDs), choke on anode, two 4.7µF Solen caps from anode of tube, one transformer between each cap and ground (or cathode). The other transformer would be say 5K : 4R, to drive a bass cone speaker, the other a P-P transformer in reverse, 4R : 10K to drive an ESL tweeter. Probably not the most elegant or otherwise best system, but if this would work it'd be very cheap! Any thoughts? Last edited by MrCurwen; 25th October 2011 at 08:20 PM.

25th October 2011, 09:11 PM	#4
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	No. __________________ Frank Last edited by Frank Berry; 25th October 2011 at 09:15 PM.

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25th October 2011, 08:49 PM	#2
Gluca tarmac ripper diyAudio Member Join Date: Nov 2004 Location: Back to Italy	No, the tube would see a very low impedance (4R from the ESL tweeter).

25th October 2011, 08:58 PM	#3
MrCurwen diyAudio Member Join Date: Feb 2010	The impedance reflected by a transformer depend on what is on the other side - the ESL panel is basically an open circuit, a capacitor. In reality it however has a very high impedance or so I've understood. Therefore it would reflect much more than 4R to the other side of the transformer. Has it been done? Can you put a low impedance primary in a parafeed circuit with an ESL panel on the other side?

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