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Bottlehead Amplifier Discussion / Comparison Thread: Crack, SEX & Mainline - Page 34

post #496 of 775
Thread Starter 
Quote:
Originally Posted by mcandmar View Post
 

 

Do it, hell i might even buy the caps for you, that's how much i want to hear your opinion on a modded S.E.X. amp :wink_face:

 

The caps are such an unknown area for me and Australia has no local retailers for high quality caps which makes it a bit tricky. Shall I send you my address? ;)

post #497 of 775
Quote:
Originally Posted by Loquah View Post
 

 

The caps are such an unknown area for me and Australia has no local retailers for high quality caps which makes it a bit tricky. Shall I send you my address? ;)


The SoundLabs Group website that I linked for the DACT pots are in Australia. They have Auricap and Mundorf capacitors.  I had good service with the pots, however I have not bought any caps off them (yet).


http://soundlabsgroup.com.au

post #498 of 775
Thread Starter 
Quote:
Originally Posted by murrays View Post
 


The SoundLabs Group website that I linked for the DACT pots are in Australia. They have Auricap and Mundorf capacitors.  I had good service with the pots, however I have not bought any caps off them (yet).


http://soundlabsgroup.com.au

 

Awesome - thanks murrays!!!!

post #499 of 775
Thread Starter 

So after much thinking and prodding from certain members (that's you @mcandmar and @murrays) I've decided to pull the trigger on some cap experimentation.

 

I've ordered the russian teflons as recommended by @mcandmar and will hopefully buy some Mundorf Silver Gold Oil caps for the output. This might delay my attenuator upgrade depending on what happens at tomorrow's meet here in Melbourne. (Read: depending on if I can keep my wallet closed after hearing the Fiio X5, UM Mentors and the HD800s with my Mainline).

post #500 of 775
Quote:
Originally Posted by Loquah View Post
 

So after much thinking and prodding from certain members (that's you @mcandmar and @murrays) I've decided to pull the trigger on some cap experimentation.

 

I've ordered the russian teflons as recommended by @mcandmar and will hopefully buy some Mundorf Silver Gold Oil caps for the output. This might delay my attenuator upgrade depending on what happens at tomorrow's meet here in Melbourne. (Read: depending on if I can keep my wallet closed after hearing the Fiio X5, UM Mentors and the HD800s with my Mainline).


A tip: if you can, try to plan your mods to change one thing at a time and review them before moving on to the next one. If you make multiple changes at once you may be mis-led as to what caused the changes.  This is because sometimes changes that you expect to be significant turn out to be minor, and vice-versa. Recently I got an unexpected "wow" result from a capacitor change that, if it was done in conjunction with another change, I would not have attributed to the capacitor (I don't usually hear much change from capacitors).

post #501 of 775
Thread Starter 
Quote:
Originally Posted by murrays View Post
 


A tip: if you can, try to plan your mods to change one thing at a time and review them before moving on to the next one. If you make multiple changes at once you may be mis-led as to what caused the changes.  This is because sometimes changes that you expect to be significant turn out to be minor, and vice-versa. Recently I got an unexpected "wow" result from a capacitor change that, if it was done in conjunction with another change, I would not have attributed to the capacitor (I don't usually hear much change from capacitors).

 

Good tip, murrays. I read mcandmar's excellent write-up over on the BH forum where he discusses changing the output capacitors after installing the Teflon ones. He said he would have liked to hear them in the other order so that's what I'm planning to do so I can provide an alternate perspective.

 

Whatever I do it will be one at a time.

post #502 of 775

Last few post have made me chuckle. You will need the attenuator to reap the benefits of the caps imho I would suggest it goes in first.

 

Sorry about your wallet

 

:popcorn:

post #503 of 775

A good start to the day here.

 

I think and hope, fingers crossed that my Teflons have finally taken a turn for the better.

 

After what was a promising start over the last couple of hundred hours my Crack had been pretty much unlistenable to its been plagued with distortion save for the odd short window of clarity which would never last more than a couple of tracks. With 375hrs on the clock now the amp has been pretty stable so far today and the distortion has gone save for a couple of wobbles, so not quiet there yet. But at last I can don my phones and start enjoying the music once again. 


Edited by JamieMcC - 4/5/14 at 7:30am
post #504 of 775
Quote:
Originally Posted by JamieMcC View Post

A good start to the day here.

I think and hope, fingers crossed that my Teflons have finally taken a turn for the better.

After what was a promising start over the last couple of hundred hours my Crack had been pretty much unlistenable to its been plagued with distortion save for the odd short window of clarity which would never last more than a couple of tracks. With 375hrs on the clock now the amp has been pretty stable so far today and the distortion has gone save for a couple of wobbles, so not quiet there yet. But at last I can don my phones and start enjoying the music once again. 

It does take awhile, doesn't it? The wonderful tonality I'm starting to hear will be well worth it.
Edited by Misterrogers - 4/5/14 at 12:10pm
post #505 of 775

Congrats on the beautiful new chassis for your mainline misterrogers!  She is indeed a stunner!

 

Regarding the teflon caps - pretty amazing that they are still undergoing dramatic changes at 375+ hours, but I guess that is consistent with what Tyler indicated he had heard from the original company that commissioned the RTI's (who supposedly burns them for 500 hours).  If I hear the same, I may have to move my mainline from home into the office for a few weeks so I can let it run for more than a few hours in a given stretch.  

 

I will be curious to see if loquah reports similar changes with respect to his incoming russian teflons for his s.e.x.

post #506 of 775

The Russian FT3 teflons i put into my S.E.X. amp did exactly the same, somewhere around the 100hour mark they sounded distinctly unpleasant and distorted the higher frequencys. They slowly mellowed out with play time.

 

I was advised to setup a burn in rig by connecting them with appropriate resistors to the speaker outputs of an amplifier, any old cheap amp will do, then just leave them to it for X amount of hours to cook.  I must have had approx 50-100 hours play time on them before they were installed into the amp, and even then they took as long to settle down fully.  Seemed a better idea to me than leaving the amp running all the time wearing the tubes out.

post #507 of 775

which are them teflons are consider to be best bang for my $ and which would you recommend ?

Thank you

post #508 of 775

Not to worried about tube life here as am just using a el cheapo 6080. I picked a box of them up them as spares for something like $1 or $2 each. Convenience also played a part my iTunes library is set up via a small dedicated aspire revo desk top pc hard wired to the dac set to shuffle the capacitor see's several days worth of very varied music frequencies before anything is repeated rather than say a cd set to repeat the same 7 or 8 tracks 24 7. 

 

The effects of the Russian Teflons sneak up on you, I removed some I had been using as bypasses on the Cracks 100uf film coupling caps and the films all of a sudden sounded course without them  and I started to understand what was meant by the plasticky sounding comment you sometimes read in the capacitor reviews. They are inexpensive and good fun to experiment with.


Edited by JamieMcC - 4/5/14 at 1:31pm
post #509 of 775
Thread Starter 

And so it begins...

 

 

I have the following upgrades to do preferrably in the following order, but it all depends on whether I can be patient enough to wait for the attenuator now that the Mundorfs are here:

  1. Upgrade stock volume potentiometer to a Dale stepped attenuator
  2. Upgrade stock output caps to Mundorf MCap Supreme Silver/Gold/Oil
  3. Upgrade stock coupling capacitors to Russian teflons
post #510 of 775
Mmmm.....Caps!

Silver/gold/oil no less
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