Sumo 9 Power Amp - Input Impedance?

pmt · 20th December 2009, 05:27 PM

I have an old Sumo 9 power amp, purchased new in the early 1980s. Does anyone know the input impedance on this amp?

Thanks in advance.

llwhtt · 20th December 2009, 05:43 PM

1 Meg.

Craig

edoherty1 · 2nd January 2010, 04:58 PM

I am looking for a drawning for this amp Sumo Nine can you help?
Ed Doherty
edoherty@cableone.net

llwhtt · 2nd January 2010, 05:53 PM

There are three different versions or I should say I have schematics for three versions. The first one is just SUMO NINE, the second two are NINE+. Determining which of the +s you will need to see what type of output transistors it uses. The first + uses 2SC1831s and the second uses 2SD555s. I have the NINE schematic loaded up and ready to go, the NINE+s I'll have to do some digging. I have tons of schematics in no particular order, unfortunately.

Craig

edoherty1 · 2nd January 2010, 06:10 PM

Thanks for the info could you send this drawing of the Sumo Nine amp that you have ready to send.
edoherty@cableone.net
Thanks a lot
Ed Doherty
let me know what you think of this amp or any of the others that you have. Sound Quality

20th December 2009, 05:27 PM	#1
pmt diyAudio Member Join Date: Mar 2003 Location: Minn.	Sumo 9 Power Amp - Input Impedance? I have an old Sumo 9 power amp, purchased new in the early 1980s. Does anyone know the input impedance on this amp? Thanks in advance.

2nd January 2010, 06:10 PM	#5
edoherty1 diyAudio Member Join Date: Jan 2010	Sumo Nine Thanks for the info could you send this drawing of the Sumo Nine amp that you have ready to send. edoherty@cableone.net Thanks a lot Ed Doherty let me know what you think of this amp or any of the others that you have. Sound Quality

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20th December 2009, 05:43 PM	#2
llwhtt diyAudio Member Join Date: Jun 2008	1 Meg. Craig

2nd January 2010, 04:58 PM	#3
edoherty1 diyAudio Member Join Date: Jan 2010	I am looking for a drawning for this amp Sumo Nine can you help? Ed Doherty edoherty@cableone.net

2nd January 2010, 05:53 PM	#4
llwhtt diyAudio Member Join Date: Jun 2008	There are three different versions or I should say I have schematics for three versions. The first one is just SUMO NINE, the second two are NINE+. Determining which of the +s you will need to see what type of output transistors it uses. The first + uses 2SC1831s and the second uses 2SD555s. I have the NINE schematic loaded up and ready to go, the NINE+s I'll have to do some digging. I have tons of schematics in no particular order, unfortunately. Craig

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