Bottlehead Forum

Bottlehead Kits => S.E.X. Kit => Topic started by: Vinylking9 on October 18, 2009, 04:54:59 AM

Title: S.E.X. kit completed!!! Headphone connection questions
Post by: Vinylking9 on October 18, 2009, 04:54:59 AM

Hi All,

Thought I would ask the experts... I just completed my S.E.X. Amp on Saturday...Works like a charm, took my time and fired it up, and sweet music came out of my headphones. This is my first build.

My question(s) are as follows, on page 36 of the instructions, the directions indicate that if I am using the amp as a headphone amp, I need to attach a 10 ohm wirewound resistor across the binding posts. I picked up a pair last night at the local Radio Shack. The only ones they carried are a pair of 10-ohm Wirewound Resistors 10 watt 10% tolerance (part 271-0132). Before installing I thought it best to ask...

1. Is that the correct resistor to use for my purpose?
2. I assume that you solder the resistor to the regular speaker binding posts, is this correct? (I know dumb question)
3. Will this prevent me from attaching speakers to the amp then, I at some time will be attaching speakers down the road, but it will be primarily used as a headphone amp?
4. If the amp is left as is (without installing this resistor), I am assuming that I am not realizing the full potential of the SEX amp, correct?

Thoughts and comments are greatly appreciated!

Best,

Pat

Title: Re: S.E.X. kit completed!!! Headphone connection questions
Post by: BNAL on October 18, 2009, 05:44:22 AM

Not sure the reason it is still in the manual, but you do not need the resistor for headphone or speaker use.

Title: Re: S.E.X. kit completed!!! Headphone connection questions
Post by: Paul Birkeland on October 19, 2009, 07:05:56 AM

Quote from: Vinylking9 on October 18, 2009, 04:54:59 AM

If the amp is left as is (without installing this resistor), I am assuming that I am not realizing the full potential of the SEX amp, correct?

This was the initial thought, as the headphones present a pretty light load at the outputs, although it appears to make very little to no noticeable/measurable difference in the SEX amp. 

Normal installation of these resistors was to use the speaker binding posts to secure them, but I wouldn't even bother using them. 

Title: Re: S.E.X. kit completed!!! Headphone connection questions
Post by: Vinylking9 on October 19, 2009, 08:31:47 AM

Thanks all for your responses!

Pat

Title: Re: S.E.X. Problems!!!
Post by: Vinylking9 on October 14, 2012, 06:28:56 AM

Help... I am a newbie in the world of building tube amps... I purchased and built this version of SEX in 2009, no mods, the basic kit sold at that time... It is the one,and only tube amp that I built, and was very proud that it not only worked, but the sound was amazing coming out of my Sennheisers.... Well, I just fired up my amp this morning, after several months of inactivity, and while the tubes light up, with a warm glow, when I listen to my cd through the headphones, sound is muted... I noticed that while the tubes are warm/hot to the touch...nothing else is...in the past I re-called that the plate would get warm to the touch as would the transformer...this was the basic SEX kit with no modifications sold in 2009...what are your thoughts that I should be concentrating on to troubleshoot and resolve...

Thanks in advance,

Pat