Bottlehead Crack - Illustrated write-up

We also need to be able to purchase the parts we need in a timely fashion without dealing with a bunch of delays. 

If we take the 100K pot for example, our normal vendors typically run out of the 100K RK-27 Alps pot before reordering, and there is a 4-6 week gap between when they have 0 available and when they get in the next batch of 1000.  This is typically unacceptable to our customers to add 4-6 weeks to our normal 3-6 week delivery time. 

In addition, the RK-27 is being discontinued, so if we had elected to use this part in any of our manuals, we would need to reshoot all those manuals and edit the instructions for the new part.

This is not an issue that we would expect to run into with the current 100K pots that we use. 

As far as caps go, I would encourage folks to educate themselves a lot more on what is standard practice in high end audio.  There are plenty of $5000+ components on the market that are LOADED with electrolytic caps and even *gasp* tantalum caps in the signal path, and these components receive rave reviews and significant praise.  Just because a cap is polarized doesn't mean that it isn't intended for use in the signal path of an amplifier. 
 
Yeah, there is a strange transition some times where what starts as basic, logical engineering practice (like Teflon is a very good dielectric) somehow turns into religion (therefore the biggest, most expensive Teflon cap is the best and only cap to use anywhere, anytime). 

I have no issue with people experimenting with various parts, in fact I encourage it. We feel that kind of play should be left to the end user to enjoy, rather than us trying to force feed everyone our favorite part flavors of the week.
 
I just ordered a stepped attenuator (24 steps ladder type, 100 k), some 22 AWG teflon silver coated OFC wire and 2 new RCA plugs. It's hard to stop upgrading :)
 
I finally got my stepped attenuator and a G.E.C CV 2523 tube.

Read about it here:
http://diy.koenigs.dk/2014/03/18/stepped-attenuator-legendary-g-e-c-cv-2523-tube/

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The GEC is a great sounding tube I am running a Crack with a similar set up

Nice work and a good read and a great resource for anyone considering making a mod or two.
 
Excellent update!

Could you include a soldering tutorial?  It is probably the most needed instruction for first timer DIY guys, and gals.
 
Grainger49 said:
Excellent update!

Could you include a soldering tutorial?  It is probably the most needed instruction for first timer DIY guys, and gals.

Thanks guys. Good idea. I'll consider making that.
 
I just received a NOS ECC82 Valvo tube and it sounds unbelievable good in combination with my G.E.C CV 2523. What a combo.
 
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