Progress of my 6550 amp

K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

I first started with this design
http://www.newmilford.com/akltam/6550amp/6550with1660.jpg
but the result was not satisfactory at all. It sounds indeed very strange, no treble. Can't get it right.
Then I came across this one.
http://www.audiodesignguide.com/my/pp3.html
I immediate adopt this design and come up with the following.
http://www.newmilford.com/akltam/6550amp/6550ampC45.jpg
Using the 6C45 as a single stage driver. The sound is indeed very nice. The music sounds so real to me. When playing the piano, I have never listen to an amp that can do it so well. I really like it. So clear. I have never hear commercial amp that sounds like this. It beats my recent purchased Papworth M100 by a mile.
But this has one drawback. I recent acquire a signal generator to test out this amp. This amp's gain is around 16. I know that many commercial amp has a gain of 22 or 33. Is this too small ?
So I tried another one:
http://www.newmilford.com/akltam/6550amp/6550ampSRPP.jpg
I only have this on for an hour. (too early to say) but then I seem not to like the sound at all. It has more gain, It sounds OK but cannot determine yet the characteristic of this amp. It does not sound as transparent as the single stage amp. (but everything in the amp is new and it needs more time).
Here is how it looks !
http://www.newmilford.com/akltam/6550amp/Lundahl6550amp1.jpg

http://www.newmilford.com/akltam/6550amp/Lundahl6550amp2.jpg

Alan

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Topic - Progress of my 6550 amp - akltam 06:09:14 11/21/03 (9)

Re: Progress of my 6550 amp// NEEDS some GRID-TUNING. - drkowmu 21:10:47 11/28/03 (1)

Re: Progress of my 6550 amp// NEEDS some GRID-TUNING. - drlowmu 21:30:19 11/28/03 (0)

Re: Progress of my 6550 amp - Danny T 23:55:59 11/23/03 (3)

Re: adding capacitors - Jim Doyle 16:36:07 02/11/04 (0)

Further progress on the 6550 amp - akltam 17:29:20 11/24/03 (1)

Re: Further progress on the 6550 amp - Danny T 13:29:20 11/26/03 (0)

Re: Progress of my 6550 amp - KevinC 19:15:50 11/21/03 (2)

What does a gain of 16 =24db ? Thanks. - akltam 06:30:59 12/03/03 (1)

Re: What does a gain of 16 =24db ? Thanks. - KevinC 06:35:32 12/03/03 (0)

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