Marantz 9 Filter CHOKE value??

bear · 21st February 2010, 09:18 PM

Anyone out there know what the actual value(s) are for the filter choke in a Marantz 9 power supply?

I have a measured DCR of ~42ohms.
Really need to know the actual inductance of that choke.
It would also be very useful to know if it is a swinging choke (ungapped) or smoothing choke (gapped) design.

Needless to say I have one in here that has a badly burned up choke.
Hoping to save the effort of unpotting it and also unsoldering the leads from a working Marantz 9 in order to measure the inductance...

_-_-bear

Tom Bavis · 22nd February 2010, 12:25 AM

It's a smoothing choke, and I'm sure the value isn't critical. I doubt it's more than 3 Henries. If you DO have access to another 9, it would be a matter of a few minutes to measure it -unsolder one lead, measure, reconnect. Seems to me your choices are to find a choke that fits with an adequate current rating, or to unpot and replace in the existing can.

dave slagle · 22nd February 2010, 12:45 AM

I have a TC-3 here that I need to find a match for. The dimensions across the top are 1.1"X 2.34" and it is 2" tall. It is also 2" across the endbells. It measures pretty close to 3hy. If your choke fits those dimensions I'd be interested in purchasing the carcass.

Or if by some small miracle anyone knows where I can source an original TC-3 I'd be very happy. This is needed to restore Sid's personal pair of marantz 5's for his widow.

BTW, the choke in the 9's is a TC-6 (6hy??)

dave

samchen · 22nd February 2010, 02:27 AM

marantz 9's choke value is 2.2Hy.

bear · 24th February 2010, 02:26 AM

samchen, you know this because you measured one?
have one?
just want to know if I can rely upon this...

Dave, you don't have the bad original one in hand??

I'm thinking unpotting this one in the oven...

_-_-bear

21st February 2010, 09:18 PM	#1
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	Marantz 9 Filter CHOKE value?? Anyone out there know what the actual value(s) are for the filter choke in a Marantz 9 power supply? I have a measured DCR of ~42ohms. Really need to know the actual inductance of that choke. It would also be very useful to know if it is a swinging choke (ungapped) or smoothing choke (gapped) design. Needless to say I have one in here that has a badly burned up choke. Hoping to save the effort of unpotting it and also unsoldering the leads from a working Marantz 9 in order to measure the inductance... _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

24th February 2010, 02:26 AM	#5
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	samchen, you know this because you measured one? have one? just want to know if I can rely upon this... Dave, you don't have the bad original one in hand?? I'm thinking unpotting this one in the oven... _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

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22nd February 2010, 12:25 AM	#2
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	It's a smoothing choke, and I'm sure the value isn't critical. I doubt it's more than 3 Henries. If you DO have access to another 9, it would be a matter of a few minutes to measure it -unsolder one lead, measure, reconnect. Seems to me your choices are to find a choke that fits with an adequate current rating, or to unpot and replace in the existing can.

22nd February 2010, 12:45 AM	#3
dave slagle diyAudio Member Join Date: Mar 2003 Location: NYC	I have a TC-3 here that I need to find a match for. The dimensions across the top are 1.1"X 2.34" and it is 2" tall. It is also 2" across the endbells. It measures pretty close to 3hy. If your choke fits those dimensions I'd be interested in purchasing the carcass. Or if by some small miracle anyone knows where I can source an original TC-3 I'd be very happy. This is needed to restore Sid's personal pair of marantz 5's for his widow. BTW, the choke in the 9's is a TC-6 (6hy??) dave

22nd February 2010, 02:27 AM	#4
samchen diyAudio Member Join Date: Aug 2009	marantz 9's choke value is 2.2Hy.

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