Capacitor bypasses

[kscwuzhere]

Hey! I currently have a Crack + speedball + dayton 100uF 250V film caps (5998 + e80cc) + hd650. I'm going to apply a resistor mod so that the circuit runs optimally with the e80cc and my PEC potentiometer is coming in the mail so those are upcoming upgrades. I'm looking to get some bypasses going and was thinking about getting the Clarity Cap 2.2uf / 630VDC (ESA Series) from partsconnexion to bypass the 220uf electrolytic in the Crack power supply. Would that work with my system (sorry im not the most knowledged about this kind of stuff)? Also, I was thinking about getting a pair Jantzen 0.47uF 800V Superior Capacitors to bypass the dayton 100uFs, would these be a good investment or would another cap give me better results (keeping in mind budget of course)? Thank you bottlehead community!

 

[JamieMcC]

I have tried the Jantzen 0.47uF in the same position and found the sound change was quiet dramatic and ultimittly not to my like as I thought the Jantzens swung to far to a clinical sound at the expense of musicality and subtlety of timbre and tone.

The 2.2 Film on the last power cap I thought was beneficial.

I also liked the results from bypassing the 100uf with a Russian K72P6 Teflon cap  I also used one as a bypass on the 2.2 film.

I have some pics and thoughts on those mods here.

http://bottlehead.com/smf/index.php/topic,5284.0.html

 

[kscwuzhere]

I also liked the results from bypassing the 100uf with a Russian K72P6 Teflon cap  I also used one as a bypass on the 2.2 film.

I have some pics and thoughts on those mods here.

http://bottlehead.com/smf/index.php/topic,5284.0.html

Hmm, maybe i should order 3 of those teflon caps, one to bypass the 2.2 film and the other two for the 100uFs. Also, the teflons that I can find are rated to 500V, is that fine?

edit: I read somewhere that as long as the caps are rated over 150V I should be fine, is this correct?

 

[JamieMcC]

The 500v ones are the same ones I used as listed here.  There are smaller value which obviously are also smaller physically. The  FT1 I think is the smallest in physical size Teflon and the FT3 is apparently the same as the K72P6 but not in the hermetically sealed metal housing and I believe the lead outs are also different on them.

http://www.ebay.co.uk/itm/0-056uF-500V-5-TEFLON-Capacitors-K72P6-Lot-of-4-/201010791480?pt=Vintage_Electronics_R2&hash=item2ecd2d4438

I ran them in that configuration for a while before changing capacitors around something which I am still doing.

After I took the teflons out and went back to just the films so as to get some reference for the next swap it really surprised me at how course and plasticky the film caps now sounded on their own.  I thought they were the bees knee's before and did not notice such an immediate difference when I installed them the improvement had built up slowly over a couple of hundred hours it was only on their removal I noticed by just how much.

 

[kscwuzhere]

So I ended up ordering 4 of those 0.056 500V Teflon capacitors as well as an Obligato 2.2uF 630VDC capacitor. I'm planning on bypassing the last electrolytic on the power supply with the obligato and one of the teflons and bypassing my 2 output (dayton 100uF 250VDC) with another two teflons. Just wanted to make sure that these installations will work and any tips for installation would be appreciated! Thank you!

 

[JamieMcC]

I encountered no problems with mine and liked how the sound developed.

Some pics here on how mine are installed scroll down a little

http://bottlehead.com/smf/index.php/topic,5284.0.html

 

[kscwuzhere]

I encountered no problems with mine and liked how the sound developed.

Some pics here on how mine are installed scroll down a little

http://bottlehead.com/smf/index.php/topic,5284.0.html

Awesome! I'm gonna wait until the output caps are burned in before I go ahead with the installation, thanks for the link!

 

[Grainger49]

D'oh,

  .  .  . 

  .  .  . 

I hadn't thought of this.  Back in the days of the Foreplay and FP 2 there was a mod from VoltSecond called a PDMPS.  That is Pseudo Dual Mono Power Supply.  It consisted of an additional pair of 220uF caps and a pair of 1k resistors, IIRC.  From the DC output of the last stock power supply cap you soldered one end of both 1k resistors.  Each resistor went to one of the 220uF caps and from those caps to the right and left channel plates (through resistors if called for).

You added these after the last stock power supply cap and it gave a dedicated 220uF for each channel.  I did this and bypassed the last stage with some Westcaps, KK POI and KK Teflons.  Crazy but that is me.

I think there is space under the hood of the Crack for someone to try this.  [/font][/SIZE][/color]