Preamp JCM800, more gain (mod Bogna Shiva)

[ANDYEFFECT]

I was looking schematic of Shiva Bogna
http://www.youtube.com/watch?v=U_e0VFpcKQU
http://www.youtube.com/watch?v=wRifqwuR3hE
.
He has a great return and I realized that the design is almost identical to Marshall, so did the regime following; Shiva from Bogna jcm800 mods ...
comments and get back to me ....
.
mods for jcm800 preamp for shiva bogner
http://rapidshare.com/files/164954197/jcm800_mods_shiva_bogner.pdf.html
.
Bogna original design of Shiva
http://rapidshare.com/files/164929541/Bogner_Shiva.pdf.html

Thanks ...

Andre

Sorry for my English to google!

[drewl]

So what do you want to know?
For those of us that have built a bunch of JCM800's and it's many variants, this isn't anything new.
There's alot of tweaking you can do to that circuit, I usually use a relay to switch between the high and low inputs and make the gain of the high input adjustable.

[ANDYEFFECT]

So what do you want to know?
For those of us that have built a bunch of JCM800's and it's many variants, this isn't anything new.
There's alot of tweaking you can do to that circuit, I usually use a relay to switch between the high and low inputs and make the gain of the high input adjustable.

I want my jcm800 Preamp with considerable gain and wonders whether these changes have I done, leave the preamp with more profit.

my mods
http://rapidshare.com/files/164954197/jcm800_mods_shiva_bogner.pdf.html

[Jered]

  Are we supposed to pay to look at your files? Right.

[Marcos - Munky]

no. he's using a translator. words for "gain" and "profit" can be the same in portuguese, it's a translator error.

[DougH]

For a "more gain" 2204 type circuit, check out the ax84 High Octane.

[runmikeyrun]

My peavey Windsor is supposedly a jcm 800 clone.  While i never sat down and compared the two schems, we A/B'd it with a really hot JCM 800 and it sounded like a (dare i say it) better version of the 800.  If you PM me your email i might be able to hook you up with the Windsor preamp schematic.

[MetalGuy]

The links are not working.

[morcey2]

For a "more gain" 2204 type circuit, check out the ax84 High Octane.

That's what I was going to say.  Or the SEL.  An SEL with a KT77 sounds awesome.

Matt

[Jered]

no. he's using a translator. words for "gain" and "profit" can be the same in portuguese, it's a translator error.

  Thanks for clearing that up. I feel kind of dumb. So be it.

[ANDYEFFECT]

new mods JCM800 (shiva bogna)

http://rapidshare.com/files/165316399/jcm800_mods_shiva_bogner-19-11-08.pdf.html

[drewl]

The quickest way is to bypass V1a's 10k cathode resistor with another 10k/cap combination....make it switchable and you have an awesome boost!