Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: Universe Man on August 24, 2021, 11:10:19 AM

Title: Want to add a pre out
Post by: Universe Man on August 24, 2021, 11:10:19 AM
I’ve recently finished building my crack, and I am interested in using it as a preamp for my speakers. I was thinking I could just glue a bit of sheet metal with rca jacks in it to the underside of the chassis, and have an rca cable just run under the gap under the wood. I’m just not sure if it’s that simple, and wanted to ask here. What terminals would I need to use? Are there grounding problems or anything like that when using another piece of metal? And do I need any extra resistors or anything like that?
Title: Re: Want to add a pre out
Post by: Paul Birkeland on August 24, 2021, 01:09:36 PM
Simpler! (https://www.sweetwater.com/store/detail/IPBQ2R10--pro-co-10-foot-ipbq2r-10-1-4-inch-trsm-to-2-rcam-insert-cable?mrkgadid=3274408774&mrkgcl=28&mrkgen=gpla&mrkgbflag=0&mrkgcat=accessories&acctid=21700000001645388&dskeywordid=92700046938453139&lid=92700046938453139&ds_s_kwgid=58700005283136159&ds_s_inventory_feed_id=97700000007215323&dsproductgroupid=411460339091&product_id=IPBQ2R10&prodctry=US&prodlang=en&channel=online&storeid=&device=c&network=g&matchtype=&adpos=largenumber&locationid=9033293&creative=249895767051&targetid=aud-994727060845%3Apla-411460339091&campaignid=1055581119&awsearchcpc=1&gclid=Cj0KCQjwsZKJBhC0ARIsAJ96n3XeRfA2o2BU2YAlmhiwPB753Ym4RT5qwmkku0G_RT623BINHya-aWMaAiRaEALw_wcB&gclsrc=aw.ds)
Title: Re: Want to add a pre out
Post by: Universe Man on August 24, 2021, 04:54:59 PM
I guess I could use that. Would it be a big difference from just using the pre tube?
Title: Re: Want to add a pre out
Post by: Paul Joppa on August 24, 2021, 06:53:22 PM
The 12AU7 has a fairly high source impedance and can't drive long lines or low impedances by itself.
Title: Re: Want to add a pre out
Post by: Universe Man on August 25, 2021, 10:26:48 AM
Ok