Tube Amp Archive

TUBEDUDE wrote: What's next?

I was gonna look into some effects but my son asked if we could build an amp together for him. Of course he wants a 100 watt head and a 4x12 cab..

Thanks Guys..I really appreciate the feedback. This thing took so long to complete (years) and so many long nights tinkering I don't know what to do with my self now :lol: . I have to find a new project, maybe some more effects. I have been wanting to fool around with some microprocessor based guita...

Hi Folks, So I am finally at the final stage of my first amp build, the only thing I need is a face plate. I finished the actual amp a few months ago but I just finished building the amp cab and the speaker Cab. Anyway, Just wanted to say thanks to the folks here who took the time to help me out by ...

Thanks for the response..

Regards,

William

Hi Guys, I want to install the Lar/Mar PPIMV into my new express build and I wanted to confirm the wiring. I can only seem to find a sketch of the connections and not a schematic with the circuit installed. I drew up a schematic of how I interpret the integrated circuit and I wanted to bounce off yo...

hans-jörg wrote:Hi,
the LarMar has no 2m2 Pot. But is a stereo pot with 2 2M2 resistor on each mid to out lug.

Doh! yeah I see it now, it shows a 250k Pot

Thank you,

William

You can try a PPIMV (LarMar) master, or power scaling like the Hall VVR. I was looking at th LarMar and I have a question. The schematics show the 220k resistors removed and the MV pot connected directly to the tubes. So the 2.2M Pot takes the place of the 1.5k's and they also get removed? Should t...

Hello everyone, Well I have just about finished my first express build (which is my first tube amp build) and I have a question about the gain/volume. I knew going into this project that it would be a beast but I was very supprised at the SPL this thing puts out at the lowest gain setting. I can't p...

Is the sole ground connection from your filter cap busbar the tinned wire that goes through the hole in the board with the two red wires in top right in that photo? If so, I think that's a big part of your buzz problem - definitely something to resolve by separating the grounds from different secti...

Is the sole ground connection from your filter cap busbar the tinned wire that goes through the hole in the board with the two red wires in top right in that photo? Yes, The ground wire goes down to to another bussbar on my main turret board which is chassis grounded. Merlin Blencowe (the Valve Wiz...

You say it's when your volume control is turned ALL the way down? Does it change at all when you turn it up just a hair? Pay very special attention to every detail regarding V1 and the volume control. And, like Jana said, post your PS numbers Yes it does change. In fact if I turn it up just a bit I...

So here are my PS measurements. B+1 428VDC B+2 412VDC B+3 323VDC B+4 304VDC B+5 287VDC -All Grounds are are chassis grounded. -I am not using heater elevation. I included some images. The Noise trace shows the scope Channel 1 connected to heater supply and Ch2 connected to the output. The B+1 Trace ...

Hi Jana, "Are all your ground connections for filter caps good? " All Caps are Brand new. and I have them grounded to a solid bus bar which is also grounded to the chassis. "Do you have a ground connection someplace that is floating?" This is what I was thinking but I have checked and checked . This...

Hello all, I just finished my first amp build using the Trainwreck express schematics and I am having a terrible noise problem. With the volume all the way down I get a nasty loud 120hz buzz. With a dummy load connected and the O'Scope connected to the output and the heater supply, I see Spikes that...