Plate chokes

ron parola · 8th January 2011, 11:47 PM

Ok, this is new to me; got my stupid project up and running with Electra-print OPT and plate choke on 304tl parafeed amp. Sounds really good, but what's interesting and new to me is when testing it through my regular speakers you can hear the music (Tocatta and Fugue in D; good test) in the plate choke. The amp is in the garage, quite a distance from the speakers and the music is perfectly reproduced, anything above about 3/8 throttle. This didn't happen with the cheapo test choke (wrong value anyway). Any thoughts there before I bother Jack. And no the choke is completely cool to the touch. Thanks Ron Parola

tubelab.com · 9th January 2011, 12:28 AM

This is not unusual. I routinely test amplifiers with a dummy load. Some OPT's are dead silent, and some talk too much. I have a pair of identical OPT's in my 845SE amp. One makes no noise, the other is plainly audible for frequencies from about 400Hz to several KHz.

mctavish · 9th January 2011, 02:11 AM

I have had Edcor GXSE's sing to me also. MJ talks about this in edition 3. Something about magnetostriction (?) where the lams actually swell and shrink in the presence of the strong magnetic field the windings generate. Not sure what you can do about it.

Gluca · 9th January 2011, 09:22 AM

get rid of those speakers and just listen to the plate chokes ... that would save you some money. lol.

(it happens ...)

8th January 2011, 11:47 PM	#1
ron parola diyAudio Member Join Date: Dec 2009 Location: Notrhern Cal	Plate chokes Ok, this is new to me; got my stupid project up and running with Electra-print OPT and plate choke on 304tl parafeed amp. Sounds really good, but what's interesting and new to me is when testing it through my regular speakers you can hear the music (Tocatta and Fugue in D; good test) in the plate choke. The amp is in the garage, quite a distance from the speakers and the music is perfectly reproduced, anything above about 3/8 throttle. This didn't happen with the cheapo test choke (wrong value anyway). Any thoughts there before I bother Jack. And no the choke is completely cool to the touch. Thanks Ron Parola

9th January 2011, 12:28 AM	#2
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	This is not unusual. I routinely test amplifiers with a dummy load. Some OPT's are dead silent, and some talk too much. I have a pair of identical OPT's in my 845SE amp. One makes no noise, the other is plainly audible for frequencies from about 400Hz to several KHz. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Plate chokes	rsumperl	Tubes / Valves	15	31st December 2009 10:58 PM
UTC CG-52AX - use as plate chokes?	rongon	Tubes / Valves	3	22nd August 2009 07:11 AM
Magnequest EXO-99 600H/150H Plate Load Chokes	cm7	Swap Meet	6	18th July 2009 01:54 AM
Plate chokes & Power chokes	JC951t	Tubes / Valves	3	19th October 2006 03:18 PM
Help with plate chokes	Original Burnedfingers	Tubes / Valves	32	11th September 2003 01:01 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th January 2011, 02:11 AM	#3
mctavish diyAudio Member Join Date: Feb 2008 Location: Niederösterreich	I have had Edcor GXSE's sing to me also. MJ talks about this in edition 3. Something about magnetostriction (?) where the lams actually swell and shrink in the presence of the strong magnetic field the windings generate. Not sure what you can do about it.

9th January 2011, 09:22 AM	#4
Gluca diyAudio Member Join Date: Nov 2004 Location: Back to Italy	get rid of those speakers and just listen to the plate chokes ... that would save you some money. lol. (it happens ...)