The Amp Garage

Cool!

Damn...that's cool!

How about posting them here so we all don't have to bug the seller?

Hi Eric,

Please remember that the tech who did the schematic actually had the amp on his bench - no one else had this "primary material" to work from. I would go 100% with the original schematic unless I had a good reason to deviate.

Good luck!

I noticed that the 470k resistors from power section grid resistors to ground were ommitted on Aaron's layout (they show up in the schematics). Can someone tell me what the purpose of these resistors is? Is it something unique to a Cathode Follower setup?

I just bought a set for my ODS. I'll let you guys know how they sound. :.)

I think Dumble needs to start sending his cabinet work out to you! That thing rocks!

Any progress on this build? It looks great! Thanks for your interest......... I've got next steps figured out: 1. Get the dropping string worked out so I have better voltages. 2. Figure out how to use my oscilloscope so I can hammer out where I'm loosing the signal, pretty sure it's V1B. The layout...

Any progress on this build? It looks great!

grtamp wrote:drop down 135v is a hard work , maybe with a zener diode , but I'm not sure! wait other suggestion!

Yeah, I agree. I'm wondering if a MOSFET based VVR/Powerscaling type circuit would be the best way to go.

I'm playing around with Post-PI Cathode Followers and I noticed that HAD connects into one of the Twin Reverb PT's high voltage taps in order to create his negative bias tap. When I do this, I get approx -285v, which is way too high for the 12BH7 setup that I'm working with. I would like to take the...

Thanks. Power transformers I am discussing. What is the deal with the 5V missing rectifier if I put the 1968 45w/50w Bassmam tranny into the 1968 40w Bandmaster Reverb chassis? PLMK. Thank you. The Bassman was solid state rectified (diodes), so it didn't need a 5V heater/filament tap for the rectif...

Anyone have any idea what mods were done to this Bassman? I've got a hacked up Bassman (someone else's hack job) in need of a new life.

I don't know that kit, but it sounds like they are elevating the center tap with the 100R resistor to eliminate hum (instead if going directly to ground with it).

I don't know that tranny, but power transformer center taps usually go to ground at or near the power transformer.