Parafeeding an EL84 SE(T)

rvrazvan · 28th February 2011, 06:53 PM

I'm not happy with the ideea of air gapped limited response low power output transformers. And my budget is not allowing for more right now. I've been reading about parafeed output but the information is not to abundent so i need some tips.
I've read that the transformer should be rated at 5 X output power. What about the chokes?

ALSO. I've seen a schematic where a toroidal power transformer with 12-0-12v or something close to that was used in a SE schematic. one section was used for the output from the amplifier and the other one was used to cancel the magnetic field thus avoiding parafeeding or big expensive output transformers.

planet10 · 28th February 2011, 06:59 PM

I don't have any answers to your questions, but i have a pair of RH84 monobloks here that are parafeed and work well. We used vinatge Grundig iron (1 console/monoblok) with 1 OPT as the OPT and the other's primary for the parafeed choke.

dave

rvrazvan · 28th February 2011, 07:31 PM

2A3 SE parafeed with PP-transformer

rvrazvan · 1st March 2011, 03:09 PM

Bump. Need help on the schematic

28th February 2011, 06:53 PM	#1
rvrazvan diyAudio Member Join Date: Jul 2010	Parafeeding an EL84 SE(T) I'm not happy with the ideea of air gapped limited response low power output transformers. And my budget is not allowing for more right now. I've been reading about parafeed output but the information is not to abundent so i need some tips. I've read that the transformer should be rated at 5 X output power. What about the chokes? ALSO. I've seen a schematic where a toroidal power transformer with 12-0-12v or something close to that was used in a SE schematic. one section was used for the output from the amplifier and the other one was used to cancel the magnetic field thus avoiding parafeeding or big expensive output transformers.

28th February 2011, 06:59 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I don't have any answers to your questions, but i have a pair of RH84 monobloks here that are parafeed and work well. We used vinatge Grundig iron (1 console/monoblok) with 1 OPT as the OPT and the other's primary for the parafeed choke. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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28th February 2011, 07:31 PM	#3
rvrazvan diyAudio Member Join Date: Jul 2010	2A3 SE parafeed with PP-transformer

1st March 2011, 03:09 PM	#4
rvrazvan diyAudio Member Join Date: Jul 2010	Bump. Need help on the schematic

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