The Amp Garage

Oh my god, I did a biggest mistake!

Thanks a lot Mark!

Sergio, Where you've been to see Robben Ford Live?

Mark, I've readed somewher there are mod for 2210, do you know something? In the schematic you posted whichtare the clipping diodes and how they work? And the last, how IC works in order to allows channel and reverb switching?
Cheer

Great explanation Martin, but I prefer to use a KT66. This change in resistors maybe I will do in my newest bild: the 2two inputs JMP 1987 lead with your/LaMar PPIMV. Talking about biasing, no change in sound I noticed, if I found 2 minutes I send you 2 different clip with the oldest and new MV Than...

Sorry guys, just fiew questions: after this PPIMV mod (despite previous) need to rebias the output tubes? In order to install 6550 output tubes we got to swap the 220k bias resistor with 150k, in this mod there's not more 220k resistor but 2M2, could I install without trouble 6550?

Ok guy I've done. The new master volume is fine and even almost noiseless! Yeah!!!

Ok, I believed it was a tube failure bias, now I'm fine.

Thanks to pd64 for trainwreck pdf file. I don't known about this, very amazing Ken Fisher's document!

N.1 Martin. Sonner I will buy the parts. Which kinda sheleded cable? Dual wire with sheld?

Great Martin, you are an artist! What is the power rating for 2.2M restistor? 1/2 W.? Could I have tonal change swaping the two bias resistors from 220k to 2.2M? And last but not the... What is the main improvement despite my PPIMV using only 500k log dual pot as suggested by George Metropulos?

If I correctly read, Type 2 using 100k linear and is traiwreck exclusive? Any schematics?

Yeah, this is true for LaMar mod via removing 220K resistor and installing on 250K dualpot two 2.2M resistors.

Huy guys, I've read somewhere (I don't remember where...) that PPIMV made using just dual 500K log alpha pot (rich mod as described in metroamp forum)could fry or damage output tubes. What about that? Is this correct or are there some problems with that kinda mod; the original Mashall use a PrePIMV ...

Oh my god Frowler, you are so big connoisseur!