2300 ohm vs 5000 ohm output trans question - diyAudio
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Old 2nd October 2010, 06:12 PM   #1
diyAudio Member
Join Date: Jul 2008
Default 2300 ohm vs 5000 ohm output trans question

Hi all,

WHats your take on using a 5000 ohm output transformer for quad kt88's?

I have a few amps now, and I think they use 2300 ohm output transformers.

Am I facing a power cut ( half the power than a lower rated trans) or I am getting an opportunity to use more output tubes (if I can use 4 on a 2300 does than mean I can use 8 on a 5000 ohm one)

I'm looking at using 120 watt power trans with 160 watt output trans using at least a quad of kt-88's (unless 5000 ohm trans are a 6l6/5881 item, then I can use those as well).

I'm thinking of a mono block architecture with individual power trans per channel.

thanks your your opinions and comments.
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Old 2nd October 2010, 06:49 PM   #2
diyAudio Member
Join Date: Apr 2009
Hi Speakerfritz,

By using a 5000k output transformer you will have a power cut.
You will have about 30 watts/8ohm with quad kt88's in triode with the 2300 ohm output transformer.
With the 5k transformer you will end up with 13,8 watts/8ohm; output resistance (damping factor) and distortion will be lower though.

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Old 2nd October 2010, 07:11 PM   #3
diyAudio Member
Join Date: Jul 2008

Very good, thanks.
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Old 2nd October 2010, 07:18 PM   #4
Arnulf is offline Arnulf  Europe
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Join Date: Feb 2009
Originally Posted by speakerfritz View Post
if I can use 4 on a 2300 does than mean I can use 8 on a 5000 ohm one
Exactly the opposite of that, if you double the number of tubes that are connected in parallel, you can halve the load impedance so if 2.3K was OK for 4 tubes, 1.15K would be OK for 8 to get identical operation for each individual tube.
mod verb, transitive /mod/ to state that one is utterly clueless about the operation of device to be "modded" and into "fixing" things that are not broken; "My new amplifier sounds great so I want to mod it."
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Old 2nd October 2010, 10:17 PM   #5
tinitus is offline tinitus  Europe
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Join Date: Nov 2005
and connecting 6ohm speaker to 16ohm output ?
sometimes we know very little, and sometimes we know too much
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