Hi,
Let me introduce myself. I’m Michiel and new on this forum. I’m walking around with the idea to build an amp from a kit for quite a while now and therefor desided to register on this forum.
I’m thinking about ordering this kit from tubetown:
https://www.tube-town.net/cms/userfiles ... ii-lay.pdf
What I would like to know is, if it’s hard to convert this layout to a ptp setup (the kit comes with a pcb). Also I was wondering what should be changed so that I can run it on a 6550 tube.
New member and first question
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Stevem
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Re: New member and first question
Why do you wish to run it with a 6550 tube?
Your talking about a expensive change here!
Number 1, without knowing anything about the power transformer in the kit it’s going to need .300 ma more available on the heater winding to light up the 6550 then the KT66 , which it more then likely does not have to spare, so your looking at burning up the power transformer.
Output transformer wise and to make good use of the 6550 it’s RAA needs to be different, also the 6550 can output a tad more wattage then the kt66 and might over time burn up the output transformer.
The Cathode resistor should be changed also to better match the needs of the 6550.
Your talking about a expensive change here!
Number 1, without knowing anything about the power transformer in the kit it’s going to need .300 ma more available on the heater winding to light up the 6550 then the KT66 , which it more then likely does not have to spare, so your looking at burning up the power transformer.
Output transformer wise and to make good use of the 6550 it’s RAA needs to be different, also the 6550 can output a tad more wattage then the kt66 and might over time burn up the output transformer.
The Cathode resistor should be changed also to better match the needs of the 6550.
When I die, I want to go like my Grandfather did, peacefully in his sleep.
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Not screaming like the passengers in his car!
Cutting out a man's tongue does not mean he’s a liar, but it does show that you fear the truth he might speak about you!
Re: New member and first question
Welcome to TAG. I wouldn't order that kit if I wanted to use a 6550. What I think Stevem is trying to say is that there are many changes to make it suitable for a 6650 and some of the changes make buying the kit a waste of money. It is a KT88 build, so order the kit and build it. You will learn a great deal. You are likely to get a very nice amp from it. We all need just one more amp, so you'll get to the 6550 amp soon enough.
Re: New member and first question
Hi!
I have built two kits from Tube Town in the past (AC30-ish EF86+ECC99 "Molly" and a Pink Taco clone). Both were dead easy to assemble. One used a tag strip, so was a bit "point-to-point", the other used a turret board. The full documentation is what's online in the PDF - there's no additional cook-book style step-by-step procedure. But all parts are there, everything fits.
If I were in your shoes, I'd get and build the kit without modifications first. It's quite affordable. Get it to work and see how it performs. You'll likely read much more about amp-building here and in other fora and come up with mods all by yourself. Happened to everyone here
And then you can build your 6550 dream amp from scratch - point-to-point. You can buy the blank TT-KT66 chassis separately and take it from there...
Cheers!
I have built two kits from Tube Town in the past (AC30-ish EF86+ECC99 "Molly" and a Pink Taco clone). Both were dead easy to assemble. One used a tag strip, so was a bit "point-to-point", the other used a turret board. The full documentation is what's online in the PDF - there's no additional cook-book style step-by-step procedure. But all parts are there, everything fits.
If I were in your shoes, I'd get and build the kit without modifications first. It's quite affordable. Get it to work and see how it performs. You'll likely read much more about amp-building here and in other fora and come up with mods all by yourself. Happened to everyone here
And then you can build your 6550 dream amp from scratch - point-to-point. You can buy the blank TT-KT66 chassis separately and take it from there...
Cheers!