Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Topic started by: tsingle999 on November 01, 2012, 04:50:07 PM

Title: Sex 2.0 with grid choke
Post by: tsingle999 on November 01, 2012, 04:50:07 PM

Velcroed in a mq high nickel grid choke in place of the 249k resistor. Didn't get any noise like when i tried it in the paramount. Put in 1 channel so i could see if it would work. The grid choke channel doesn't have as much bass boom and cleaner highs from what i could tell. Gonna try to put it in the other channel now which may be a bit more difficult cuz of space issues.

Title: Re: Sex 2.0 with grid choke
Post by: tsingle999 on November 01, 2012, 05:29:02 PM

Ok i velcroed the 2nd grid choke in and it fits and works and sounds pretty good! Time to burn them in! When i go to secure these properly with screws and nuts should i add a solder tab and take it to ground? Thanks...
By the way the volume is noticeably lower using the russian teflon 0.1 coupling caps.

Title: Re: Sex 2.0 with grid choke
Post by: Grainger49 on November 02, 2012, 02:17:27 AM

Looks like the underside of my Paramours.  Stuffed full of big film caps.

Nice work!  What are the second largest caps, at right, doing in there?

Title: Re: Sex 2.0 with grid choke
Post by: tsingle999 on November 02, 2012, 06:09:38 AM

I know i need to secure them better! Those black caps are silver n oil parafeed caps 1.8uf. The largest are obbligato 22uf film oil caps. Ive got some 47 uf black gates in there too.

Title: Re: Sex 2.0 with grid choke
Post by: Grainger49 on November 02, 2012, 08:07:06 AM

Thanks ! 

Oooo, I didn't see the Black Gates.  I have a Gain Clone using all Black Gates in the dual mono power supplies.  The power cord is common, the fuses are not.

Title: Re: Sex 2.0 with grid choke
Post by: Jim R. on November 12, 2012, 03:59:22 PM

Tom,

When you mount the chokes, they should probably be isolated from the chassis plate.  As for gro9unding, I'd try it both ways, but a la bottlehead -- a piece of buss wire taken back to the common ground point.

HTH,

Jim

Title: Re: Sex 2.0 with grid choke
Post by: tsingle999 on November 12, 2012, 05:59:07 PM

Thanks Jim. I will try it both ways. Its ok ungrounded. I just bolted the chokes in but put teflon washers between the chokes and chassis. I just finished putting in the m4 iron. While i was at it i thought i would replace 1 russian teflon with the french teflon from diyhifi to compare those...

Title: Re: Sex 2.0 with grid choke
Post by: tsingle999 on November 13, 2012, 06:08:57 PM

Ok after installing the iron i am back to one channel not working. Im going to resolder the 47 uf bg cap. The hardest part about working on this version of the sex amp is the electrolytic caps without wire leads. Could someone recommend replacements that would have leads so i can work on the amp more easily? Thanks. Taran