Glad this kit is coming back!

P

physicsmajor

New member
So will the new kit be S.E.X. version 2.2, or turning over a new number to 3.0?  Exciting!  This was a really awesome kit, I'm glad it'll be back in the stable - not least so I can recommend it.

I wondered if you'd just move to the 6FJ7 compactron version with minimal wiring changes, though the layout and allusions to a 'surprise tube' in the email makes it seem like more may be afoot.
 
Doc, is there a timeframe for when more details will be released?

I was about to the pull the trigger on a SEX around the time that it was announced it would be discontinued and I still have an itchy trigger finger.
 
We will have more info available soon. It's the 99% the same circuit as the previous version, with a different tube and a better layout that makes the build easier. There is a small change in the heater supply that brings the noise floor down from that of the previous version.
 
Cool, I can't wait to see what you come up with. I love my S.E.X. Amps. I'm curios to hear how the sound of the new tube compares with the 6DN7.
 
If it's 99% the same then it should be easy enough to convert the 2.1 to the new tube if you wanted to. That's what the SEX is all about right? I'm curious about the tube too. The old page specified that it was easy to mod it to use 6EM7/6EA7 tubes.

My modded SEX is my go to amp at the moment.  It's a wonderful amp and I'm excited for the latest update!
 
If I may be so bold enough as to guess, I'm thinking the 99% same circuit means that now we will see a pair of additional 100 ohm resistors in the heater supply. I already did that on my SEX, and I found it a worthwhile improvement to the point I was curious why it not had already been implemented.

Next I'm thinking the tube change is likely related to ease of availability - 6DN7's aren't a "dime a dozen" any more
 
Anyone who comes to the DIY meet today will be able see for themselves what tube we plan to use. We'll have the prototype that was built for the manual available to inspect.
 
Recap post by Doc B. says it is the 6FJ7, but also notes it's got a significantly lower noise floor than the current S.E.X.

I'm curious about the changes to the circuit (or perhaps just the layout?) to achieve this.
 
After I finished building the second 6FJ7 SEX amp, and verified that the chassis plate layout would work as intended, I spent a lot of time trying different configurations of heater grounding and measuring the noise level with each of them. 

The layout had to change to accommodate different heater rectifier diodes, along with the new universal power transformer.  There is now much more room for larger parallel feed capacitors as well, as those buggers get pretty huge. 

-PB
 
That is great to hear as i always found mine a fantastic pairing with sensitive cans like Grados, but could never recommend one as the stock kit wasn't quiet enough.  Glad to see the kit coming back :)
 
Caucasian Blackplate said:
After I finished building the second 6FJ7 SEX amp, and verified that the chassis plate layout would work as intended, I spent a lot of time trying different configurations of heater grounding and measuring the noise level with each of them. 

The layout had to change to accommodate different heater rectifier diodes, along with the new universal power transformer.  There is now much more room for larger parallel feed capacitors as well, as those buggers get pretty huge. 

-PB
Click to expand...

Neat I'm looking forward to seeing the new lay out in the flesh. Can I ask if the uf values and voltage ratings for the parallel feed and interstage capacitors are similar to those used in the Sex?
 
Yes, of course. The 6FJ7 is a 6DN7 structure in a different envelope. So the circuit is going to be the same. To reiterate - different tube pinout, universal transformer, better layout and manual, slightly different heater connection and quieter operation because of it.
 
I know it will be quieter which is a great thing.
Does the sound quality change much from the prior version?
 
It sounds essentially the same except that it is more quiet and hence has little better resolution.
 
Is there a need for a C4S Upgrade Kit for the SEX 3.0?

On the fence to either pre-order or wait to see what's in store for black friday/cyber monday.
 
The C4S will be released sometime next year.

Orders for this kit are coming in. At the close of the preorder period, parts will be ordered to the quantities required. If you choose wait longer to place your order, you will not be in the first batch, and therefore will have to wait longer for shipping.
 
Wizzie said:
Is the much choice of different tubes and will tube rolling see significant improvement?
Click to expand...

There are a fair number of variants in the 6FJ7, with a mix of gray and black plates.  Luckily, however, I haven't run into any series heater configurations, so that will be completely consistent. 

IMO, tube rolling was never a particularly important consideration in the 6DN7 kit. 
 
Caucasian Blackplate said:
There are a fair number of variants in the 6FJ7, with a mix of gray and black plates.  Luckily, however, I haven't run into any series heater configurations, so that will be completely consistent. 

IMO, tube rolling was never a particularly important consideration in the 6DN7 kit.
Click to expand...

Thanx heaps for the info

I am looking forward to the assembly of my kit when it becomes available

 
You must log in or register to reply here.

Similar threads

Doc B
  • Sticky
Introducing S.E.X. 3.0
Replies
0
Views
17K
Doc B
Doc B
mcandmar
Project Babybottle: The AC powered Quickie based headphone amp.
2 3
Replies
47
Views
11K
mcandmar
mcandmar
Back
Top