mods für jcm 800

[MichiK]

www.guitargeek.com
gibts so ziemlich alles "geeked" den rest mit paint machen

 

[AintNoEddie]

www.guitargeek.com
gibts so ziemlich alles "geeked" den rest mit paint machen

Exakt! Einige Dinge muss man halt' selber "geeken" bissl mit Photoshop & Co, so wie ich das ME50 zB. In der Plauderecke gibt's auch einen eigenen Geek-Thread

 

[Andreas Gerhard]

Nabend,
kann mir jemand ein paar Links zu Seiten mit Mods zu den 800ern geben?
Würde mich freuen!

Gruß
Andy

 

[hoss]

Nabend,
kann mir jemand ein paar Links zu Seiten mit Mods zu den 800ern geben?
Würde mich freuen!

Gruß
Andy

Hier "mein Standardtext"

2203/2204
Find the 68K input resistor (R3) and place a 330pf 1kv ceramic cap across it. Beefs up the
mids and lows
Change the 10K cathode resistor (R6 found on V1B) and replace it with a 4.7K resistor. This
will give you more gain, but if you want more still, try a 1.5K.
Locate the 820ohm cathode resistor (R9 found on V2A) and place a .68uf cap across it. This
will increase the gain a little, but will mostly give you a mid range boost.
I personally find that just changing the 33K tone slope resistor (R15) with a 56K sounds
awesome in almost any Marshall. JCM800's are certainly NO exception! While you're at it,
change the treble cap from a 470pf to a 250pf. Both of these bring the brightness down, and
bump the bottom and mids up.
If you want a darker tone overall, try this one:
Change C1 (.68uf cap) which is found on V1A and replace it with a .47uf cap. This alters the
midrange response.
You can also:
Replace the 470k Ohm resistor that is tied to the input tube grid with either a 68k Ohm, 34k
Ohm or 10k Ohm resistor. The lower the resistance, the darker the tone, but 68k is the
"classic" value. (Don't be tempted to remove this resistor altogether). It has to be there to
attenuate the grid circuit and prevent excessive overload conditions.
Remove the 470pF cap which bridges the 470k Ohm resistor you just removed.

1987/1959
For more gain, you can change plate resistor values. You can try anything from 56K to 220K.
The 220K's will extreamly monterous distortion. I think these amps had 100k plate resistors
as stock. Don't quote me.
You can also use different values for your cathode resistors. Try 820ohm, 1K, 1.5K, & 2.7K.
If this still isn't enough gain place a .22 or .68uf 25volt cap across the first gain stage's
cathode's resistor
For more touch response:
1. On the first preamp tube, Jump pins 1 to 6, 2 to 7, & 3 to 8.
2. Wire a 100K resistor to pin 1 (plate).
3. Wire a 3.3K resistor with a 25uf 25volt cap across the resistor, to pin 3 (cathode)
4. From the channel's "hot" side of the input jack, wire a 68K resistor to pin 2. (grid).

You can of course try other values on the cathode and the plate. You could also try an
820ohm resistor with a 330uf 50volt cap on the cathode & a 130K resistor on the plate or
even a 220K if you like the sound.
Again, change the tone stack values! These amps sound really nice with this simple change:
Tone slope resistor to 56k, and treble cap to 250pf.

 

[Andreas Gerhard]

schonmal nicht schlecht, hast du auch noch mehr ? =)
vielleicht ganze Seiten?

danke übrigens schonmal