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Old 10th January 2003, 08:09 AM   #1
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Default Opinions and ideas on my new amp

He everyone.. this is my first thread on this forum. I've posted this design on audioasylum before, but thought I'd try here too just to get as many opinions as possible. It's a design for a single-ended KT88-amp.

http://213.67.45.70/se_kt88.gif

I've tried to keep the design as simple as possible.... I have yet to figure out the values at the cathode on the KT88 but the rest is taken directly from svetlana's homepage. What do you think of the design? Will it work? I know it won't produce much power but I'm perfectly satisfied as long as I get about 5W.
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Old 10th January 2003, 08:31 AM   #2
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Default Re: Opinions and ideas on my new amp

Quote:
Originally posted by Mikael Abdellah
I've tried to keep the design as simple as possible....
Looks like it should work fine (but i'm just a rookie). Nice & simple. What kind of iron?

dave
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Old 10th January 2003, 08:35 AM   #3
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All irons (output and mains) will be custom made sowter's. I'm still working on the power-supply. I will use a solid state rectifier.
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Old 10th January 2003, 11:06 AM   #4
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Just a suggestion or two...

I would lean more toward stock off the shelf transformers if you can. It would make it more cost effective for others to build your amp.

I would use a tube rectifier as opposed to solid state.
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How much power is expected with this design?



Joe
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Old 10th January 2003, 11:43 AM   #5
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Power estimation so far is (as stated above) 5W.

About the transformers... As output transformer Hammond 1628SE should work beautifully. Has the same specs as the one I'm getting from sowter. Anything with a 5k primary, 43% ul-tap that can handle 120mA or so should do just fine. And I'm not sure but I do believe the 372JX (also from hammond) should do the trick as mains. It can handle 8A heater-current so the voltage might go up a bit since my amp only draws 3,9A.

I prefer solid-state because they are easy to work with and can handle larger caps. So far i plan to use one lytic 2200uF, two lytic 22uF and eight poly 2,2uF. I think a 2200uF cap would stress most rectifiertubes a bit too much.

Are you saying that other people might wanna try this amp?? I can't tell you how glad I would be if someone did. I mean.. that's gotta be the ultimate compliment. But since I haven't tried it myself yet you guys might wan't to wait a bit. But then again.. I can't think of one good reason it wouldn't work.
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Old 10th January 2003, 12:22 PM   #6
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Default Transformers

Quote:
All irons (output and mains) will be custom made sowter's
Sowter custom transformers cost the same as standard types.
They are good and I would recommend them.
However it makes sense to buy local.
Do not Lundahl make something suitable?
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Old 10th January 2003, 12:29 PM   #7
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Problem no 1. I couldn't find any lundahl-xfrmrs that seemed to fit. I could be wrong.

Problem no 2. (The biggest issue) Have you ever seen a lundahl??? Why don't they make a good looking cover for their transformers??!??

The reason I wen't with sowter is that they look awesome (I will goldplate the shields) and that I can specify them just the way I wan't. A big plus is that people i've spoken to says they sound REALLY good.
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Old 10th January 2003, 12:35 PM   #8
dhaen is offline dhaen  Europe
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Mikael,

Ok. If Lundahl don't do them, then that's it.
Yes, I've seen Lundahls, and I've also seen the enclosures that Aqua Blue (Belgium) make. They are nice, but box shaped. You seem to be attracted by transformer "bell ends".

Cheers,
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