Preamplifier Premier 16Ls2 schematics wanted

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ghibli.iron
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Preamplifier Premier 16Ls2 schematics wanted

Post by ghibli.iron » Sun May 31, 2015 8:00 am

Hi All,

I'm looking for a copy of the schematic diagrams and parts list for conrad johnson premier 16 ls2
Anyone can help would be very much appreciated.

Thanking you in advance.

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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by admin » Sun May 31, 2015 8:30 am

Unfortunately, this is not something we have in our database at this time. If you do end up finding the schematics, if you could send them to me I can put it into our database to help other users.
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Current Conrad Johnson Equipment in System: Evolution 2000, PV-12L, and D/A-2b.

ghibli.iron
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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by ghibli.iron » Tue Jun 02, 2015 3:31 am

all I need to know the code of the power transformer, to see if you can adapt the input power from American 110V to italian 220V

jeffreybehr
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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by jeffreybehr » Tue Jun 02, 2015 6:25 pm

ghibli, schematics are on the way and I've asked c-j if the power transformer can be rewired for 230VAC.

Now I have a request for you--could you shoot a couple good pics--well focused and at least, say, 3000 pixels wide--of the interior of the preamp, one from the front and one from the rear? If you can send me at least one, PM me and I'll send you my e-ddress.

Also FWIW, this one looks very easy to substantially improve the SQ, first by replacing the combo-4uF output coupling caps with something lots better. Next I'd replace the trios (one trio per channel) of 2uF/250V. PS-output caps feeding the B+ to the plate resistors.
Last edited by jeffreybehr on Wed Jun 03, 2015 3:38 am, edited 1 time in total.
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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by admin » Tue Jun 02, 2015 7:37 pm

Database updated with Premier 16 schematics as well as manual!
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Current Conrad Johnson Equipment in System: Evolution 2000, PV-12L, and D/A-2b.

ghibli.iron
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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by ghibli.iron » Sat Jun 06, 2015 6:49 am

many thanks

@jeffreybehr,

I have not the preamp, I am negotiating the purchase with the seller, as soon as I completed the purchase I will send you pictures. promised!

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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by ghibli.iron » Mon Jun 15, 2015 11:54 am

jeffreybehr wrote:ghibli, schematics are on the way and I've asked c-j if the power transformer can be rewired for 230VAC.

Now I have a request for you--could you shoot a couple good pics--well focused and at least, say, 3000 pixels wide--of the interior of the preamp, one from the front and one from the rear? If you can send me at least one, PM me and I'll send you my e-ddress.

Also FWIW, this one looks very easy to substantially improve the SQ, first by replacing the combo-4uF output coupling caps with something lots better. Next I'd replace the trios (one trio per channel) of 2uF/250V. PS-output caps feeding the B+ to the plate resistors.

hi jeffreyber
send me you mail address.

AudioDon
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Re: Preamplifier Premier 16Ls2 schematics wanted

Post by AudioDon » Sat Mar 10, 2018 4:20 am

Hey JeffreyBehr,
Would the upgrades you specified for the 16LS2 be applicable for a 16LS? What's the difference between the 2 models?
Do you have any other info about the upgrades you specified?

On a different topic, I have a Premier 14 that Music Technologies modded. They added small value TFT V-Caps in parallel with the existing PS caps and added Shottky Fast recovery diodes. It sounds a lot better, and actually very close to the 16LS, but still has some grain in the highs. Would upgrading the caps in the audio circuit be beneficial here as well?

Thanks,
Don

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