K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

Because...

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danlaudionut

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In Reply to: Re: IT Question posted by KevinC on September 02, 2003 at 19:15:22:

1) I did try to design one using the 1626, but no one gave me any feed back on operating points or how it sounded in a preamp circuit(they either couldn't remember or never wrote me back)and it required large plate and filament voltages so I needed at least two large transformers with tube rectifiers and tube regulators. Too expensive.
2) I can get decent OPT's cheaper than decent step down IT's.
3) 6N1P's are good sounding tubes by all accounts and fairly cheap (also still in production). They are easy to work with - not prone to much oscillations or microphonics. They work fine in with low plate current and require less filament current, so cheaper transformer and only one.
4) I am going to be powering Decware Selects which use the 6N1P as the gain/driver, so I am keeping to their strengths.

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Re: Because... - KevinC 05:59:06 09/03/03 (2)
1) I did try to design one using the 1626, but no one gave me any feed back on operating points or how it sounded in a preamp circuit(they either couldn't remember or never wrote me back)and it required large plate and filament voltages so I needed at least two large transformers with tube rectifiers and tube regulators. Too expensive.
Understood.
2) I can get decent OPT's cheaper than decent step down IT's.
Not from Lundahl. Hhhmmmm.
3) 6N1P's are good sounding tubes by all accounts and fairly cheap (also still in production). They are easy to work with - not prone to much oscillations or microphonics. They work fine in with low plate current and require less filament current, so cheaper transformer and only one.
OK, I agree here.
4) I am going to be powering Decware Selects which use the 6N1P as the gain/driver, so I am keeping to their strengths.
I'm afraid I have no experience with your proposed approach. I would simply grab a pair of outputs from someone and try it quick-and-dirty inserted into your normal signal chain to see how it sounds.
Let us know what you find.

Kevin Carter
K&K Audio
www.kandkaudio.com
- RE: Not from Lundahl. Hhhmmmm. - danlaudionut 15:38:42 09/03/03 (1)
  Sorry if I broke some code of ethics but when no one responded from my posts on the Tube Asylum and the Tube DIY Asylum. I wanted some feedback and I got frustrated at the silence and I figured that you might have the answer if I kept it generic enough. But now I know that the silence was because no one has done this before.
  I am building a preamp/crossover, for which I need 2 for my tweeter, 3 for my midrange and 3 for my woofer per channel if I could afford it I would buy Lundahl (I still may as funds allow at least for my woofer for a lower F3). That is if it works.
  I am using Marchand Passive LC Componants for the crosover, which I understand give a 1K load.
  To your recommendation to hook it up in the normal signal chain and see what it sounds like,
  (To Boldly Go Where None Have Gone Before)
  it seems to be the story of my life.
  I will post on my findings, when they are conclusive.
  Whether Yea or Nay.
  Thanks and Sorry again if I breached some ethics.
  DanL
  - Re: RE: Not from Lundahl. Hhhmmmm. - KevinC 15:50:38 09/03/03 (0)
    Hey, Dan, somebody has to do it first! No code of ethics breeched here. I only ask for honesty and some consideration of what the consequences of what is written may be. You passed that test.
    Let us know what you hear.
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com

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