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PostPosted: 22 Apr 2020, 16:36 
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Hi wonder for this circuit, the resistors that don't have Watt rating marked, what kind of Watt rating should that be? Thks
MK


Hi

Remember that resistors have a voltage rating as well as a wattage rating.

Depending on the resistor you could use 1/2 watt for the 1K and 470K but I tend to use 1 watt as a minimum in most projects.

So the 47K 2 watt on the anode of the driver tube you need to check the working voltage just being 2 watt isn't necessarily going to cut it, 47K 2 Watt 500V working or more is what you need.

In some applications in the cathode of a tube if you get flash over it can blow the resistor apart, so just paralleling multiple low wattage resistors to get the wattage rating won't withstand surge current with high voltage.

Regards
M. Gregg

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PostPosted: 29 Apr 2020, 19:06 
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rebuilding the kt 88se during quarantine... :nuke: :lildevil: :wizard:


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PostPosted: 29 Apr 2020, 19:34 
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gonzalo guerrero wrote:
rebuilding the kt 88se during quarantine... :nuke: :lildevil: :wizard:

What a good idea. I built four projects. Part of that was completing one. Happy with all four.

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Projects: "Carbon” - MM phono preamp | 180W RAW Class D amp | "Illusion" - 6SN7 SRPP preamp in a plastic jiffy box | “Salt Cellar” - Mono 807 triode integrated amp |


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PostPosted: 31 May 2020, 22:28 
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almost done....only the rca's and output tranys to install...i guess until tuesday i will done.


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PostPosted: 03 Jun 2020, 23:51 
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Almost...


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PostPosted: 04 Jun 2020, 00:33 
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Neat

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PostPosted: 08 Jun 2020, 17:02 
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Black beauty...


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PostPosted: 09 Jun 2020, 07:09 
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Hi All,

Not finishing, but just venturing in the KT88/6550 Single Ended amp formula, under "skull-wooden prototype" form... :D ;)

Image

Image

Image

Cheers ! :beerchug:

-tbln

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PostPosted: 18 Oct 2020, 15:16 
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Hello!

I've been working on a chassis for a single ended KT66 amp, using http://diyaudioprojects.com/Tubes/KT88/ schematic as a reference. I'm making a few modifications, however I need some advice on how to move forward. Let it be known, this is a prototype, so I'm using hammond trannys and chokes to keep cost down.

First off, I want to build a duel mono system that uses one power transformer to power left and right output transformers, with pre-amp, all in one package. I have access to testing equipment, signal generators, a wave spectrum analyzer, etc. I've done work on plenty guitar and bass amps, but this is my first leap into hi-fi.

I was looking at hammonds 272HX tranny https://www.hammfg.com/electronics/transformers/classic/200 however, Im unsure if it's powerful enough. The schematic calls for 5V, 375-0-375V, 6.3V. The 272HX secondary specs say 600V C.T. @ 230ma. (It has the appropriate heater supply 5V and 6.3V btw.)

How do I compare these specs? And as it powerful enough to power duel mono? Single mono?

My second question, is once the power transformer is peachy, talk to me about chokes. I've read that some people have built single ended pieces without chokes (and they're noisy), to people using 10H 230mA with a 5H 250mA choke following it like the Mikael Abdellah's design. What can i get away with for a prototype? What is essential?

Many thanks!


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PostPosted: 27 Oct 2020, 14:37 
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Joined: 18 Oct 2020, 14:42
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Hi Bernardo,

What chokes did you install and what are their values?

:lildevil:


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