Started New Express build

[M Fowler]

On this Express I'm going with Martin Manning's version using an eyelet board 4.5" x 12" like rj's PCB board.

I'm going to use Magnetic Components Express PT/OT on this one. Also, $17 blank ebay chassis and $100 ebay cherry cabinet. Going cheap route but not cheap in tone.

Mark

[xtian]

Nice, Mark. I'm right behind you. Please tell me where to find large-enough blanks of fiberglass.

[xtian]

Found this: .078" 12.00" X 24.00" $19.21

http://g10fr4.com/g10_fr4_sheet_material.html

Are you using 2mm sheet?

[M Fowler]

I think I got this board from Turretboards.com but McMaster would be a good place to shop as well and order in long cuts.

Mine is 1/8" so 0.125 (4.5" x 12") or buy longer and cut to suit.

Mark

[C Moore]

That is a different layout, nice to see.
Is the cab in the picture the one you call the "100 dollar cherry" cab from Ebay.?
Thanks

[Bob S]

That'll put a smile on your face Mark.
It works well taming the Liverpool a tad, so I've got to believe it'll make an Express more manageable.
Standard circuit / tone stack ?
Are you thinking master/vvr ?
Looks great !

[xtian]

I think I got this board from Turretboards.com but McMaster would be a good place to shop as well and order in long cuts.

Mine is 1/8" so 0.125 (4.5" x 12") or buy longer and cut to suit.

So do 3mm turrets work on this?

[M Fowler]

That is a different layout, nice to see.
Is the cab in the picture the one you call the "100 dollar cherry" cab from Ebay.?
Thanks

No it's not the Cherry cab I'll post photo later.

Mark

[M Fowler]

I think I got this board from Turretboards.com but McMaster would be a good place to shop as well and order in long cuts.

Mine is 1/8" so 0.125 (4.5" x 12") or buy longer and cut to suit.

So do 3mm turrets work on this?

The 3mm turrets are the longer version so I would think that is the correct size for 1/8 garolite and 2mm for 1/16 garolite.

Maybe others will speak up.

Mark

[M Fowler]

That'll put a smile on your face Mark.
It works well taming the Liverpool a tad, so I've got to believe it'll make an Express more manageable.
Standard circuit / tone stack ?
Are you thinking master/vvr ?
Looks great !

Bob I'm thinking of going with exactly what Martin did presonance, cut and MV. Standard tone stack with 33k grid V1 and 820R grid.

The PCB I built with rj's board worked very well I liked that amp so I'm sure this one will be stable as well.

Mark

[C Moore]

That is a different layout, nice to see.
Is the cab in the picture the one you call the "100 dollar cherry" cab from Ebay.?
Thanks

No it's not the Cherry cab I'll post photo later.

Mark

10-4
The reason I ask is that I payed 75 bux (a good price for a well made cab) for a Poplar cab that i had to paint, of course.
Not sure I will ever be able to sell a build with my name on it, but a "real" head cab might give me a fighting chance.
Thanks

[C Moore]

.....

[martin manning]

Looking good Mark, nice to see another build using this layout! I went back to the old-school presence on my Express because the presonance whistled at some extreme settings. I liked the tones, though. It will work either way, and it's easy to switch over, as described at the end of the thread on that amp. http://ampgarage.com/forum/viewtopic.ph ... 761#209761 I could not be without the PPIMV and cut.

I got my last G-10 board from McMaster, a 12"x24" piece... that's how the eyelet board in the amp got to be 12" long ;^)

[Colossal]

I went back to the old-school presence on my Express because the presonance whistled at some extreme settings. I liked the tones, though.

Martin, did you notice a change in the gain or overall sound/feel of the amp going to the older presence circuit? I recently compared the 5k/0.1uF old school method to the newer school 4k7 || 0.1uF->25kB presence in a modded Marshall type build and found I liked the 4k7 sound better. For my Express build I plan to use the traditional circuit as it will be a 'purist' build.

Thanks,
Dave

[martin manning]

Hi Dave,
On the "bright" end the old-school presence (where the 5k pot is the tail, and the 0.1u goes from the wiper to ground) and the Presonance sound very similar. I really haven't compared the old-school and new-school directly, which would be interesting. I can see from looking at traces in a sim that they differ in the shape of the roll-off as the controll is swept. I went with the old-school on my 2204-ISH amp, 'cause Jana said to. I tend to set any presence up around 9 and leave it there, though.