Help for Building The S.E.X. 2.1,Impedance Switch and C4S

[i luvmusic 2]

Hi!
  Since i painted all the TRANSFORMERS for the SEX Kit,For the  choke and the Output Transformers do i need to scrape some of the paint on the TAB so the screws can have a contact on the transformers?

THANKS!

 

[fullheadofnothing]

Yes.

 

[i luvmusic 2]

THANK YOU!

 

[i luvmusic 2]

I just finished my SEX KIT just now and i'am loving it so far.........
I finished it without any issue/problem.

THANK YOU!Bottlehead for such a nice KIT (SEX and CRACK for me).

THANK YOU!

 

[i luvmusic 2]

I installed the Imp. switch  last night then put the switch into 4 ohms tap the amp gets very quiet no more slight HUM,I tried 4 and 8 ohms taps they are both quiet but i prefer 8 ohms tap to my ears it have a little more bass than the 4 ohms tap.

Installed the C4S this morning and fired up the amp to my surprised everything sounded really good.

 

[i luvmusic 2]

Hi!
  My DAC have a Balanced output so i would like to use that for the S.E.X. amp input,I would like to know how to rewire the  RCA input to  3 pin XLR(Balanced Input)?I'am thinking of running the S.E.X. in full Balanced  by using Balanced Input and Output(I have the Imp.switch installed).Do i need to replace the POT or it's ok to used the existing pot for my intended applications?

Thanks You!

 

[Paul Birkeland]

My DAC have a Balanced output so i would like to use that for the S.E.X. amp input,

I would have to ask why?  There are certainly times when a balanced output is useful, but this is generally when you have a very long run of cables between components.  Depending on the component, the balanced outputs can sound worse.

I would like to know how to rewire the  RCA input to  3 pin XLR(Balanced Input)?

You will need a pair of 10K:10K input transformers.  I like Sowter 3575's, which are $160 per pair.

I'am thinking of running the S.E.X. in full Balanced  by using Balanced Input and Output(I have the Imp.switch installed).Do i need to replace the POT or it's ok to used the existing pot for my intended applications?

You'd want to add loading resistors to the output side of the 10K transformers, but the pot will work fine.

 

[i luvmusic 2]

The reason i want to run everything in Balanced the HD650 and SEX sounds good in balanced (to my ears) and since the DAC is capable of balanced that is why i thought about it.
  If i need to buy the  Sowter 3575 just to run in balanced without knowing if these MOD will make the SEX sound better or worst for now i will leaved the SEX amp the way it is It's already  a good sounding amp.

THANK YOU!

 

[Paul Joppa]

Yeah, it's fairly easy to make an acceptable balanced output on a single-ended circuit, but an acceptable balanced input is much more difficult - you need either a transformer or a different tube circuit with at least one more triode per channel.

 

[i luvmusic 2]

I thought it was that easy.

Thank you for your reply!

 

[i luvmusic 2]

I screwed up this resistor,Is it safe to run the amp like this while i'am waiting for the replacement?

THANK YOU!

https://www.head-fi.org/content/type/61/id/1235009/width/500/height/1000/flags/LL

 

[i luvmusic 2]

I want to replace the Solen 1.5uf 630V caps with this Mundorf 1.5uf 600V is it safe to use this 600V caps.THANK YOU!

 

[Paul Joppa]

Yes, 600v is close enough to 630v to be no problem. Don't go lower in voltage, however. IIRC, Mundorf also makes some 800v caps - I've never heard any report on their sound as parafeed outputs but I'd be interested to hear from anyone ...

 

[mcandmar]

Yes, 600v is close enough to 630v to be no problem. Don't go lower in voltage, however. IIRC, Mundorf also makes some 800v caps - I've never heard any report on their sound as parafeed outputs but I'd be interested to hear from anyone ...

I used the Mundorf Silver/Oil in mine and found them a very nice improvement over the Solens, specifically better high end and low end extension which were a little rolled off with the stock caps. I chose the Silver/Oil on the basis of many caps roundup reviews i read all pegged them as being the most neutral sounding of the Mundorf range. The fact i haven't changed a thing with the amp since then really speaks to how happy i am with them.  I do have a pair of Jupiter flat stacked wax caps to try at some stage too, they popped up on eBay at a price i couldn't resist  :

http://bottlehead.com/smf/index.php?topic=5316.msg53501#msg53501

Loquah installed the Silver/Gold/Oil versions into his which are known for being warmer in the mid range, which coincidentally is exactly how he characterized them at the bottom of his post below.

https://www.head-fi.org/t/683012/bottlehead-amplifier-discussion-comparison-thread-crack-sex-mainline#post_9831527

You did ask...

 

[i luvmusic 2]

Yes, 600v is close enough to 630v to be no problem. Don't go lower in voltage, however. IIRC, Mundorf also makes some 800v caps - I've never heard any report on their sound as parafeed outputs but I'd be interested to hear from anyone ...

THANK YOU!

 

[i luvmusic 2]

I used the Mundorf Silver/Oil in mine and found them a very nice improvement over the Solens, specifically better high end and low end extension which were a little rolled off with the stock caps. I chose the Silver/Oil on the basis of many caps roundup reviews i read all pegged them as being the most neutral sounding of the Mundorf range. The fact i haven't changed a thing with the amp since then really speaks to how happy i am with them.  I do have a pair of Jupiter flat stacked wax caps to try at some stage too, they popped up on eBay at a price i couldn't resist  :

http://bottlehead.com/smf/index.php?topic=5316.msg53501#msg53501

Loquah installed the Silver/Gold/Oil versions into his which are known for being warmer in the mid range, which coincidentally is exactly how he characterized them at the bottom of his post below.

https://www.head-fi.org/t/683012/bottlehead-amplifier-discussion-comparison-thread-crack-sex-mainline#post_9831527

You did ask...

I was going to use the Mundorf 1.5uf 600V Supreme which is less expensive than what you have used but now i changed my mind i might used something else too many caps to chose from.


Thanks!

 

[mcandmar]

There really isn't a whole lot of options over 600v that dont break the bank.  There a bunch of different cap round up tests you should read through first before making up your mind, when you read 3-4 different reviews you will start to get a good idea of the flavor of each brand/model.

I bought a pair of these to try as i have used them before with good results, http://www.ebay.co.uk/itm/261593528750?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT, only problem is they are huge at 2" x 5".  I should have known really as all the Russian caps usually are.

 

[i luvmusic 2]

Need help for DEAD Left channel,tubes are ok  both tubes works on right channel.I saw a smoke,blown the fuse left side smells burnt.I replaced the fused and turned it back on both tubes lights up but left channel is dead.

 

[mcandmar]

Need help for DEAD Left channel,tubes are ok  both tubes works on right channel.I saw a smoke,blown the fuse left side smells burnt.I replaced the fused and turned it back on both tubes lights up but left channel is dead.

Resistance checks, if that doesn't find anything post a few pics.    I would hold off on powering up again until you trace the magic smoke.

 

[i luvmusic 2]

Resistance checks, if that doesn't find anything post a few pics.    I would hold off on powering up again until you trace the magic smoke.

Resistance check is all good but C4S board B LED's are dead.