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KT120 Oddblocks
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=3089
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Author:  poty [ 05 Apr 2018, 02:18 ]
Post subject:  Re: KT120 Oddblocks

There could be any number of problems if you use a transformer out of conditions it was designed. I read the Bruce's explanations just before your latest message (and fully support them) like that: testing a transformer out of the circuit is useless.

Author:  ozapaydin [ 05 Apr 2018, 06:55 ]
Post subject:  Re: KT120 Oddblocks

Thank you, Poty. I think you both are right. Well, another question in my mind is that should I use a load on the secondary when testing the transformer attached to the circuit? If I should, is it ok to use a 8.2 ohm 50 watt resistor. Cause I don't want to do any harm to my speakers.

My bests,
Ozan

Author:  gofar99 [ 05 Apr 2018, 16:27 ]
Post subject:  Re: KT120 Oddblocks

Hi, If you are testing an amp yes. Use a load all the time. Without a load any testing will not reflect what the amp is doing. Resistors are cheap and have essentially linear behavior as a load. Far better IMO than a speaker which will have impedance variations and phase shifts because of the crosssovers.

Good listening
Bruce

Author:  ozapaydin [ 09 Apr 2018, 02:29 ]
Post subject:  Re: KT120 Oddblocks

Connecting 8.2 ohm load to the secondary removed ringing problem on the scope although I didn't connect the OPT primary to amp circuit. So far, so good.
My bests,
Ozan

Author:  TIJ-NIKI [ 12 Apr 2018, 16:46 ]
Post subject:  Re: KT120 Oddblocks

Hey guys. after much wait (and weight.. ) my Edcors arrived. Damn they are massive! Right now i am setting up a new shop for my business so free time went out of the window. this will be another summer project ;(

Author:  gofar99 [ 12 Apr 2018, 20:40 ]
Post subject:  Re: KT120 Oddblocks

Hi, Yes indeed they are huge. You need ones that large to safely handle the dc current as this is a class A design and the current is essentially constant at around 280ma in the output trannies. The power trannie needs to be able to deliver that at around 450 volts. That is a bunch of watts. :hot:

Good listening
Bruce

Author:  TIJ-NIKI [ 13 Apr 2018, 13:56 ]
Post subject:  Re: KT120 Oddblocks

It's a room heater that also dubs as amplifier ;)

Author:  gofar99 [ 13 Apr 2018, 15:26 ]
Post subject:  Re: KT120 Oddblocks

Hi, Yeah. I love multi tasking devices. Also good for developing muscles. Just lift one up about 10 times a day for better biceps. :blush:

good listening
Bruce

Author:  TIJ-NIKI [ 27 Apr 2018, 14:57 ]
Post subject:  Re: KT120 Oddblocks

First PSU board ready. Now to do the other channel. How many volts should be the heater circuit be elevated at? I am getting around 50volts on mine

Image

Author:  ILoveHiFi [ 27 Apr 2018, 15:47 ]
Post subject:  Re: KT120 Oddblocks

62k/(62k+220k)(300v)=66v
The orignal circit is seen to be a 62k and 220k voltage divider from 300v to heaters to elevate it

having 50v is correct and allright

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