K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

600:600 versus 10k:10k

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This might seem like a funny thing to ask since I have been in this hobby for a few years now..
One thing I do know is that if you gain something in one department you lose something in the other department..there are few few lunches around.
The reason why a 1:1 input transformer with 10k:10k in diy audio is often used is because it is easier to drive right?
So why and where would a 600:600 ohm transformer be used...rather than say a 10k:10k?

TIA,
Bas
To infinity and beyond!!!

Follow Ups:

Re: 600:600 versus 10k:10k - Thorsten 05:48:46 06/17/05 (2)
Hi,
> So why and where would a 600:600 ohm transformer be used...
> rather than say a 10k:10k?
Usually (but not allways) the 600:600R Transformer will be intended as output transformer, to be driven by a suitably beefy solid state stage (I find a Video Op-Amp like the AD811 or LM6181 to be a good choice, followed by a suitable 51 Ohm build out resistor). So you will be able to use single ended high current circuitry and still drive a 600 Ohm load balanced, galvanically insulated to around +20dbu. Bifilar wound 600:600R output transformers tend to have prodigous level handling due to huge cores, low losses and frequency responses into the MHz range (no typo) due to relatively few turns.
Usually the 10k:10k transformer will be a "line briding" (in other words it does not materially load a 600 Ohm Load) line input transformers, designed to be loaded by 10K and usually have high level handling usually by having many turns and usually smallish cores.
It is quite possible to make a "universal" 10K:10K Transformer which performs admirably as "600R" output transformer and which when driven by a suitably low impedance source will drive 600 Ohm fine and with wide bandwidth and which will shine equally as 10K input transformer, but such a device must be huge and expensive (at least the single one I am aware of is).
By trageting the transformer narrowly at a given application better economics tend to accrue.
Ciao T
- I think I have a good place for the LL1527XL after reading - Bas Horneman 06:17:00 06/17/05 (0)
  your post..I'll use it as a output transformer on my RJM VSPS phono stage?
  To infinity and beyond!!!
- Thanks Thorsten for your comprehensive reply...nt - Bas Horneman 06:12:57 06/17/05 (0)
  .
  To infinity and beyond!!!

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