Express -- please help me distill it down

[gearhead]

jaysg,
I'm doin' the BOM dance as well. I didn't see any 2K's on the Kelly 90 layout or the schem. And there were some missing 1M's.
Here is my list of resistors:

6 100K
1 1K5
1 150K
1 2K7
2 10K
3 220K
1 470R
1 82K
1 15K
1 47K
3 1M
1 1K/25W
2 1K5/2W
2 100K/3W
4 9.1K/3W
2 1K/5W

If you want I can post up a more-complete spreadsheet in a few days.

How's your spreadsheet going? I'm about to do one myself.

[jblues]

but ken hand tuned his express amps tweaking bits for each customer so a list is going to be a good starting point but you better get some extra values if you are going to tune it like he did, lol. like the resistors on the cathodes get adjusted and that 820 ohm after the volume pot gets values from between 820 ohm to 2.2k also there some other spots things get changed like the .002 150k highpass network between stage 2 and 3...
the phase inverter and power tubes are all the same in most real wrecks
the second stage cathode resistor changes from 2.7k to 1.5 for ...lol more gain in some wrecks!
one of the secrets is the right output transformer...ken likes heybour trannies i heard now but wrecks used different ones. i bought some plexi marshall trannies from them they sound dead on(they reversed engineered an original of course). the b+ rail is also crucial there's less filtering so there's some planned paracityc (positive feed back) going on there between stage 3 and stage 1 since they are both in phase with each other also the box must be alluminum not steel ...why? because the ground current goes through it so this effects the ...ok bad terminology but back pressure like with water. also the steel chassis affects the magnetic fields of all the transformers...aluminum does not.
in a regular amp this stuff doesn't matter...but this amp was designed outside of the valve specifications so minute things matter. since when you play on ten you will hear stuff like the thunk of the wood when you touch the guitar....you think an amp is any different? nope electronically no problem but the valves are very fragile slightly microphonic parts hehe.

[gearhead]

but ken hand tuned his express amps tweaking bits for each customer so a list is going to be a good starting point but you better get some extra values if you are going to tune it like he did, lol.

Oh, believe me, I plan on doing that! Just wanted to get the basic list down, and then expand to get some +/- values.

Thanks!

[jem]

I've been contemplating slight modifications/experiments. I plan on using UF4007's instead of 1N4007's. Rick Erickson (Ampage) had some ideas about why they would be better in the output tube spike suppression.

Ken covered using fast switching diodes for the out tube protection in the Trainwreck Pages. He never used them because they sucked off some of the high end. Trainwreck only uses 1N4007.

He also recommened using a 130V MOV across the primary of the power transformer for protection, but looks like it's not included in his own amps.

FWIW, I plan on using the fast recovery diodes in the power supply. I don't see where that could hurt.

[UR12]

I've been contemplating slight modifications/experiments. I plan on using UF4007's instead of 1N4007's. Rick Erickson (Ampage) had some ideas about why they would be better in the output tube spike suppression.

Ken covered using fast switching diodes for the out tube protection in the Trainwreck Pages. He never used them because they sucked off some of the high end. Trainwreck only uses 1N4007.

He also recommened using a 130V MOV across the primary of the power transformer for protection, but looks like it's not included in his own amps.

FWIW, I plan on using the fast recovery diodes in the power supply. I don't see where that could hurt.

There is a 130v mov on every power switch in every amp Ken Built

[jem]

He also recommened using a 130V MOV across the primary of the power transformer for protection, but looks like it's not included in his own amps.

FWIW, I plan on using the fast recovery diodes in the power supply. I don't see where that could hurt.

There is a 130v mov on every power switch in every amp Ken Built

Ah, that makes sense. Thanks for the correction. Guess that'll teach me to go by the schematics alone. It would be nice if they were on the schematics as well (at least on the ones I saw they weren't).