Cartridge compatibility with LS-100

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BfloDave

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Cartridge compatibility with LS-100
« on: 14 Jan 2014, 06:07 pm »

i use a LS-100 with phono.  Currently I'm running a MM cartridge into the lower gain phono section with  two 12AU7's.  I'm considering several MC carts, a Denon DL-S1 (0.15 mv) and A-T AT33PTG/II (0.3 mv).

I understand that the second tube will have to be changed to a 12AX7 in order to provide more gain.  Will the preamp then have enough gain to use either cartridge without a sut?  Both carts recommend a load of > 100 ohms.  The manual covers dip switch settings for 100 and 500 ohms.  Can the dip switches be configured for say, 250 or anything between 100 and 500?

Does anyone have experience with either of these carts in a LS-100?

jtsnead

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Re: Cartridge compatibility with LS-100
« Reply #1 on: 14 Jan 2014, 08:51 pm »
I had the DL-S1 running into a Jasmine phono stage with 70 db gain, but it really did
not come alive until I used a Bob's SUT, I would think the AT would be a better match
or the AT OC9

Dan would have to answer the loading question

JMosch

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Re: Cartridge compatibility with LS-100
« Reply #2 on: 14 Jan 2014, 10:59 pm »
As far as loading goes, I have found that with my current phono pre (ARC PH5) I settled on 200 Ohms for my Benz M2. With this pre you can toggle the loading using a remote, its very easy. But I will say that the dif between 200 and 500 was pretty small.

I have the LS-100 in for evaluation and will be trying the phono stage as soon as my 12AX7 comes in.  I took a look at the resistor arrangement in the phono section and there are two pairs of 100 Ohm and 1k resistors in addition to the 47k. This gives you settings of 50 (2 100s in parallel), 100, 500 (2 1ks in parallel) and 1k. What would be good for both of us would be to replace the 1ks with 500 Ohms. Then you'd get settings of 50, 100, 250, & 500. You have to pull the phono board and replace the resistors. Space is pretty tight, so I don't think you could parallel up each 1k, which would do the same thing.

EDIT: After a little more thought, it would be easier to replace one of the 100s with a 200. Then you would have settings of: 67, 100, 200, 500, & 1k.
« Last Edit: 15 Jan 2014, 08:58 pm by JMosch »