tamura opt need help

robertc · 7th January 2005, 03:19 PM

hello, i'm a newbie. i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.

NickC · 7th January 2005, 03:42 PM

Cf1 should go the feedback resistor and Cf 2 should go to ground
I am based in KL, Msia
If u are around this area perhaps i can help by taking a better look at it.
But the suggestion above is standard
Cheers

audiousername · 8th January 2005, 08:03 AM

Quote:

Originally posted by robertc
i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.

I think you have a set of OPTs with cathode feedback taps; basically windings intended to apply negative feedback by being placed in series with the cathodes of the output valves.

If I'm right, you'll have to place them in series with the cathodes of the output stages.

Do you have a model number on the OPTs?

fdegrove · 8th January 2005, 08:23 AM

Hi,

Quote:

I think you have a set of OPTs with cathode feedback taps;

Exactly.

Tamura F 2011 or 2012 probably.

Cheers,

robertc · 8th January 2005, 01:48 PM

thanks, model F 2011. can i connect the cf1 & cf2 like marantz model 9?

845 · 8th January 2005, 02:01 PM

This way

robertc · 8th January 2005, 02:39 PM

is there any power increase with connecting the cf.

fdegrove · 8th January 2005, 03:51 PM

Hi,

Quote:

is there any power increase with connecting the cf.

No.

Cheers,

robertc · 9th January 2005, 12:39 AM

so what is the purpose of cathode feedback?

audiousername · 9th January 2005, 04:32 AM

Quote:

Originally posted by robertc
so what is the purpose of cathode feedback?

Reducing distortion, which it does quite well.

Not everything is about more power....

7th January 2005, 03:19 PM	#1
robertc diyAudio Member Join Date: Dec 2004 Location: my	tamura opt need help hello, i'm a newbie. i got a pair of tamura pp opt 100 watt with 2 terminals feedback marked cf1 & cf2. can anyone tell me how to use these feedback for pp kt88 power amp.thanks.

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
Tamura HM-1	fxsound	Tubes / Valves	2	20th July 2009 07:42 AM
tamura F-683 pole question	sbcellis	Tubes / Valves	3	13th March 2007 03:52 PM
Tamura F-475 in Parafeed?	arnoldc	Tubes / Valves	2	17th August 2005 12:07 AM
Tamura inputs trans used as linestage out	cm	Tubes / Valves	2	11th May 2005 08:14 AM
How do you properly ground a Tamura OPT?	arnoldc	Tubes / Valves	2	15th July 2004 12:43 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

7th January 2005, 03:42 PM	#2
NickC diyAudio Member Join Date: Dec 2001 Location: Earth	Cf1 should go the feedback resistor and Cf 2 should go to ground I am based in KL, Msia If u are around this area perhaps i can help by taking a better look at it. But the suggestion above is standard Cheers

8th January 2005, 01:48 PM	#5
robertc diyAudio Member Join Date: Dec 2004 Location: my	thanks, model F 2011. can i connect the cf1 & cf2 like marantz model 9?

8th January 2005, 02:39 PM	#7
robertc diyAudio Member Join Date: Dec 2004 Location: my	is there any power increase with connecting the cf.

9th January 2005, 12:39 AM	#9
robertc diyAudio Member Join Date: Dec 2004 Location: my	so what is the purpose of cathode feedback?