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 Post subject: Kt120 in a tramp
PostPosted: Tue Dec 11, 2018 7:41 pm 
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I am looking at the kt120 data sheet, and am wondering if the tramp power transformer will handle the ma? What do you think coco?


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 Post subject: Re: Kt120 in a tramp
PostPosted: Fri Dec 14, 2018 10:00 am 
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Holy Ghost
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What is the HV current load for that tube?

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 Post subject: Re: Kt120 in a tramp
PostPosted: Mon Dec 17, 2018 10:24 pm 
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Plate current range is 135-160 ma. I assume I would use the 2.5k. Ot tap. And the proper cathode resistor.
The data sheet says 250ma at 650 volts, class a at 400volts single tube is the 135-160ma listing. Also what value would I use for cathode resistor?
It says plate dissipation at 400 volts is 20 watts, would ot handle this?


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 Post subject: Re: Kt120 in a tramp
PostPosted: Tue Dec 18, 2018 8:35 am 
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Holy Ghost
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I dont know how well this will work. I expect the HV will drop due to the high current flow. You can try it and see with the HI bias and 2.5K but watch the PT for heat.

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 Post subject: Re: Kt120 in a tramp
PostPosted: Sat Dec 29, 2018 7:01 pm 
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Success, ended up putting a Tung sol 6550 in my tramp. Talk about sound and tone. Plenty to play out with.
P.s. using. 12" spkr.


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 Post subject: Re: Kt120 in a tramp
PostPosted: Sun Dec 30, 2018 9:13 am 
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Holy Ghost
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Cool, what were your measured voltages?

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 Post subject: Re: Kt120 in a tramp
PostPosted: Mon May 25, 2020 2:41 pm 
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Plate is 368v is that ok??? Should I change screen resistor??? I put a 10w 200ohm cathode resistor in, is this ok?? Should I change r14 or r16?


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