K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

Re: Lundahl Transformer Attenuator??

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SuperB

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In Reply to: Re: Lundahl Transformer Attenuator?? posted by gdahl on October 17, 2002 at 08:05:32:

Hi Gary!
Thank you for the advice! I'll order the S&B TX-102 transformer attenuator and try into the K&K Audio parallel feed line amplifier.
I have a preamplifier which has 2 stages: one gain stage direct couple to the cathode follower without feedback, and the cathode follower has a cathode resistor. Some people suggested I try the C4S from Bottlehead, and the other suggest I put some type of iron (I gues they meant choke or sth.) to replace the resistor on the cathode follower.
Do you suggest any iron from Lundahl or other manufacturer I can replace the cathode resistor of the cathode follower in my preamplifier?
Thanks again!

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Re: Lundahl Transformer Attenuator?? - KevinC 06:07:08 10/19/02 (0)
There are a couple of things that I would suggest. You can use a Lundahl LL1667/15mA or LL1668/25mA audio choke depending on the amount of current passing through your cathode follower. Or you could use the K&K Audio CCS, which is an easy-to-apply 2 terminal current source. It is used as the plate load in the SE line stage circuit (see the schematic on my webpage). Either choice will work, but I have no sonic experience with this application, because I tend to steer clear of RC coupled cathode followers. They tend to "dry" the sound out, in my experience. I think that the use of either of these devices will help relieve some of the dry character of the cathode follower.
Kevin

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