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PP CFB toroidy OPT
PP CFB toroidy OPT
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Old 12th March 2019, 08:21 PM   #41
mbrennwa is offline mbrennwa  Switzerland
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I may be a bit late to the party, but this looks super duper good!

I have some experience with toroidal output trannies from my KT66 project (schematic and photos here). I like those toroids very much, but they need a bit of care to make sure the DC bias currents are as symmetric as possible. The conventional auto bias or fixed bias might not be the best solution here, because the tubes will drift after a while, which will give an imbalance of the bias currents and therefore saturate the toroid. I used a Tent bias board to keep the balance, but I guess there are other ways to do that, too -- just make sure you have some thingy taking care that the bias currents are always nicely symmetrical!

Will this become a kit? Or will you provide boards and a BOM? I am already making up excuses to build this...

Last edited by mbrennwa; 12th March 2019 at 08:24 PM.
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Old 13th March 2019, 06:28 AM   #42
multi is offline multi  Australia
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I have used the toriody very good.
I use RCA 811a the current draw is always the same all kt88's/6550 drift very bad compared to 811A. I have toriody with 2k A to anode for the 811a with cathode feedback still got to make the amps
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Old 13th March 2019, 09:15 AM   #43
LKA is offline LKA  Europe
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Quote:
Originally Posted by mbrennwa View Post
Will this become a kit? Or will you provide boards and a BOM? I am already making up excuses to build this...
The driver pcb is already prepared for additional autobias board.

I had no intention of selling boards and at the present moment no piece available for interest. It is possible that I will change my mind.

PP1-DRIVER-pcb2.jpg
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Old 13th March 2019, 03:37 PM   #44
mbrennwa is offline mbrennwa  Switzerland
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You make such beautilful boards just for one build? Wow.
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Old 13th March 2019, 06:23 PM   #45
LKA is offline LKA  Europe
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Not entirely, five boards were made, two for me, two are reserved for my friend and one is spare.

If you have serious interest I can share you gerber files .
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Old 15th March 2019, 03:16 PM   #46
tomlang is offline tomlang  United States
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I have the toroidy cfb 6.6k output transformers on order. They supply the dimensions but in the past they were wrong. Can I get a measurement of the diameter and height of this transformer?
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Old 17th March 2019, 05:41 PM   #47
LKA is offline LKA  Europe
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TTG-CFB4000PP standard version, exact dimension without leads, 108x60mm
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