Homebuilt JCM 800 to SIR #36 mods

[Tone Junkie]

Does putting it across the plate and cathode or across plate  resister do the same thing though thats what Im wondering. sorry I know another stupid rookie question but I dont know .       
Thanks Bill

[JayB]

Does putting it across the plate and cathode or across plate  resister do the same thing though thats what Im wondering. sorry I know another stupid rookie question but I dont know .       
Thanks Bill

Sort of. Across the plate and cathode, it's passing the ac signal to ground through the cathode resistor and by pass cap. Across the plate resistor, it's not allowing the ac signal to develop across the plate resistor in the chosen frequencies that cap effects. The end result is the same.

[Chris Mitlyng]

here are some pics from my afd build.
let me know if you see anything wrong.
this amp rocks and oh my god is it loud!
thanx to all who have helped me build this thing.

Rockgod212,

Do you have the most recent schematic for the amp build? I am looking to build my own and cannot access the Metroamp forum.

[sluckey]

It's been 6 years since Rockgod212 has logged onto the forum.

[MFowler]

I built DarkBlueMurder's (DBM) version of a #39 and that amp is fantastic, built a second with same results and onto a 3rd for myself because I can't stop smiling whenever I play the amp I sold to my friend.

It's a Marshall JCM800 2203 the 100w version with extra gain stage and cathode bypass capacitors switching for boost.  I also add Resonance/Depth pot to get some bass back in.

Mark

[SILVERGUN]

Thanks for sharing Mark.
If nothing else, it made me go back and save that schematic and look it over.
Kinda reminds me of Bogner's Ecstacy red channel preamp topology...how do your preamp voltages compare to these?
http://el34world.com/charts/Schematics/files/bogner/bogner_ecstacy.pdf
 

[MFowler]

Thanks for sharing Mark.
If nothing else, it made me go back and save that schematic and look it over.
Kinda reminds me of Bogner's Ecstacy red channel preamp topology...how do your preamp voltages compare to these?
http://el34world.com/charts/Schematics/files/bogner/bogner_ecstacy.pdf

Sorry I checked to see if I had a voltage chart on my two builds and do not.  When  I complete number 3 I will save a voltage chart and post.