Glad this kit is coming back!

[Paul Birkeland]

I would strongly recommend installing the C4S before changing out the 0.1uF interstage coupling caps. 

-PB

[Natural Sound]

I would strongly recommend installing the C4S before changing out the 0.1uF interstage coupling caps. 

-PB

I'm a little bit confused. Can you expand on that a little please?

[Adrian]

I would strongly recommend installing the C4S before changing out the 0.1uF interstage coupling caps. 

-PB

I do not currently have plans to touch the interstage 0.1 uf cap only the 1.5uf parafeed output cap.  So, I'm assuming changing the parafeed cap before the installation of the C4S when it becomes available is OK (I'm thinking positioning/location, considering I don't choose some gigantic size cap!).

[bernieclub]

Quick question about the new SEX, and BH amps in general...is it OK to operate the amp long term with the chassis plate in a vertical position?
 

[Doc B.]

Yes to the SEX kit. Indirectly heated tubes can be oriented on their side.

Maybe to the DHT amps. It depends upon how the tube filament is oriented. It needs to be vertical. If it is horizontal there is a slight possibility of it sagging and hitting the grid.

[bernieclub]

Thanks Doc!

[physicsmajor]

(asking about recommending install of C4s before changing out caps)
I'm a little bit confused. Can you expand on that a little please?

The reason is that the C4s provides a material upgrade to the sound, so you should strongly consider applying the upgrade(s) to the stock kit, hearing the differences, and then if you still want to tweak go after the caps/resistors.

[Paul Birkeland]

While there is plenty of room in the new kit for cap upgrades, the C4S kit will occupy a little bit of space that you might be tempted to use for larger interstage coupling caps. 

[Natural Sound]

While there is plenty of room in the new kit for cap upgrades, the C4S kit will occupy a little bit of space that you might be tempted to use for larger interstage coupling caps.

Ah, OK, that makes more sense. Thanks.

[Natural Sound]

I'm in. You have my pre-order and I threw in a Stereomour II shunt regulator upgrade for good measure. 

When people come over to my house and they hear the S.E.X. amp they want one (and a set of Orca's). I've purchased two S.E.X. amps directly from Bottlehead and two used, unassembled kits from private parties in the past. I only have one left. Thats gotta tell you something. Keep up the good work, Bottlehead! You guys rock.

Tom AKA "Natural Sound" in Albuquerque.

Just got UPS tracking info. 

[Adrian]

Just received my S.E.X. 3.0 via UPS!
I already have a 2.1 version w/C4S in the living room listening area and wanted another S.E.X. on my desk.

The kit came with two different brands of 6FJ7:  GE and Sylvania

I am currently sourcing additional 6FJ7s and what to have pairs of the same maunfacturer.
I would not be surprised to hear that GE, RCA, and perhaps Sylvania 6FJ7s are all made by the same manufacturer (probably GE).
I really don't expect any substantial sonic differences but I would like to have tubes with the same markings (if not only for appearance).

I remember reading in this forum that a given manufacturer of the 6DN7 tubes for the earlier S.E.X. versions should not be mixed with another manufacturer.
Can this be said for the 6FJ7 as well?

Just curious. 

[Doc B.]

I don't know who said not to mix 6DN7s, but that's rubbish. They all run the same in the old amp and it won't hurt anything except a case of OCD. Ditto 6FJ7s.

[Adrian]

Doc B

This is where I got the idea of not mixing brands of 6DN7s:

http://bottlehead.com/smf/index.php?topic=6795.msg82645#msg82645

I used different brands of 6DN7s before.
Anyway, I may struggle against my OCD concerning matching brands!
How it sounds is what really matters.

[fullheadofnothing]

Tubes are matched by manufacturer and structure. Branding is separate from manufacturer. Both tubes were made by GE. Look for the permanent dots that GE etched on the glass on all tubes they made. Also I will bet that the plate structures are the same (grey, black, or one grey one black), because your tubes were hand matched, by me.

[Adrian]

Thanks, Josh ... learning everyday!