Hi Dave,

Good to get your message.

Well, I'm not so sure which post you mean in particular,
I can get kind of 
long winded about SE amps even when there is nothing
about the Champ12 ;)

IIRC you have the actual Champ12 you would like to
improve?  The upgrades to 
the PCBs similar to how I did mine are an improvement,
but a bench SE6L6 
built from surplus junk using a much simpler circuit can
easily be made to 
sound better in every way using the exact same tubes.
The original schematic 
& layout I really don't like, but it does handily provide
all the proper knob 
functions as originally set up, so I improved it the best
I could within 
those limitations.

Or maybe you want that newly designed power supply for
the 350volt B+ range?  
I haven't combined these yet but that is what direction I
would go if I was 
to gut the amp for a point-to-point circuit using the
same chassis & OPT.  
Seems like just changing the power supply to this 350V
type could be done to 
replace the separate power PCB without having to remove
the main audio PCB 
though.  I would have to study that further.

Or a complete audio circuit could be installed
point-to-point to replace the 
main board as well.  Only then I have not seriously
pursued what I would do 
about all the knobs, ideally I would want them all to
perform pretty much 
what they originally did, but I do not have a proven
point-to-point layout 
for the reverb, headphones, phono in, and line out, and
my 
pseudo-channel-switching tube overdrive has not been
perfected as a 
replacement for the stock one but I know its better at
least.  On the bench I 
concentrated more on the simple older Champ circuit with
only one 12AX7, then 
overdrive that with pedals either transistor, opamp, or
tube which I now have 
complimentary designs primarily to overdrive clean tube
amps into their 
characteristic distortion.

And I am really committed to old point-to-point without
even any eyelet or 
turret board, so getting the full original amp functions
would take a lot of 
exerimentation.  Someday I might do it but so far I just
seriously rewired 
the power supply like in my older posts to get as much
from the original PT, 
then upgraded the quality of key parts on the main PCB
with some changes in 
values for voicing improvements.  It is much better but I
am still not happy 
with the remaining hum even though it is reduced.

The *easy* way to a whole new SE 6L6 might be to give up
reverb, line out, 
and the phono in, maybe headphones (probably wouldn't be
too hard to add the 
stock headphone output after the rewiring?), then put in
a basic BF champ 
circuit (except point-to-point) to use the first 12AX7
including the bass & 
treble plus maybe add a mid control which would take up
the unused reverb 
knob hole.  Then use the other 12AX7 for built in
switchable overdrive and 
use the OD gain & volume knobs as originally intended.  A
custom faceplate 
could cover unused holes for final cosmetic appearance.
This would attempt 
to be just a better sounding version of the original
using only 2 gain stages 
like the old champs, you would lose some functions in
exchange for better 
tone & response, but with overdrive you would still have
3 (or 4 if you 
wanted them) gain stages, allowing it to still have the
original capability 
of being a Metal player's practice amp.  If only 3 gain
stages were 
preferred, in that case it would be possible to use the
extra triode for an 
FX loop send or return, and an original or new hole on
the front or back 
could contain a level pot.  I do have a tube FX send (or
line out) that can 
be added to any amp without needing a tube socket since
it uses a tube with 
solderable leads wired inside the chassis, you would
still need a new or 
previous hole for its level pot if you want external
access instead of a 
small internal trimpot.  It should be possible to do
reverb like this 
instead, but probably wouldn't be worth it unless there
was a better reverb 
*tank*.

Or the same chassis is very tempting to just make it a
6L6 Vibrochamp12 and 
just use the other 12AX7 for killer tremolo.  Then you
could still have a mid 
knob but you would use the overdrive knobs for tremolo
instead, only problem 
is finding the reverse audio pots for the VC tremolo, I
think maybe WeberVST 
has them now but I don't remember if a full size pot
would fit in the Champ12 
panel even if the PCB were removed.  Could always use
regular mini pots and 
turn counter-clockwise to increase trem functions :(
This would be the more vintage or blues style amp for
players who would not 
utilize the high-gain channel if it was there anyway.

It would be ideal if you were in Houston or someplace
close by in Texas or 
Louisiana, but maybe this could be possible.  Tell me
more.  I am not really 
in the amp business but still trying to enjoy tone
experiments which this SE 
work is really a by-product of.  Do you have other amps,
and what kind are 
they or what kind have you tried and liked a lot even if
you don't own it?  
Also what kind of guitar(s) and playing style, and
examples of artists you 
like the tone of.

Sincerely,
Mike