The Amp Garage

JamesHealey wrote:late 80s g12t75 actually sound good. The new ones don't for sure.

I have a ton of cabs around here, and my FAV is a 2x12 with an older G12T-75 and an Eminence Wizard. Odd.

I would mind seeing one...
aqueenen@cogeco.ca

Just looking to build yet another Rocket, and am just choosing some iron. Have any of you experimented with different B+ voltages? I think the clean headroom would be increased dramatically with 360 VDC. Would like to hear your findings....

The amp is fixed bias and tubes are nicely cookin' @ 42ma. SS power supply, 428VDC B+. Custom Heyboer 4k5 opt transformer (same size as Marshall 50W). Larger PS dropping resistors for the pi/pre sections. PI has 470R cathode + 18K tail. No negative feedback. I'll endeavor to get some clips done.

I have built a number of Express amps and a few Rockets. My latest wreck thing takes the Rocket front end and marries it to the Express PI and EL34 output stage, but no negative feedback. Talk about an interesting amplifier. The only deviation is I put a "body" switch with changes the first coupling...

I have come to the conclusion that pickups are very important in the Trainwreck equation. I just played one of my Express clones with a Strat that had 3 Jackson J-200 stacked single coils. Low output, but maybe the best pickups I've heard into an Express. The were 2 other strats in the room had 1 wi...

I have built a number of Express amps, and recently completed a Rocket. I think it might be my choice over the Express. Use a boost in front and you can get wonderful hi gain modern tones. I used a Boss GE-10 EQ. I used a 680pf coupling cap, and added a mid pot instead of just a resistor. My B+ was ...

Thanks for the clips. Great stuff. Do you have Since I've Been Loving You kickin' around anymore?

dumbles and their clones in general fire "backwards"... different speaker manufactures all fire different too, ev, jensen, jbl etc..... celestions fire backwards in general. so if you wire up a celestion normally with a dumble it should be in phase. im pretty sure tone tubbies fire the opposite, so...

If the ot's are wound backwards, wouldn't the negative feedback loop turn into a positive feedback loop?

My preference is for 250k L. No question.

Sounds great! Would love to know the settings.

The screen node can easily drop 40VDC with an hard chord and the volume control at noon.

Increase the .002 cap to .0047 (the one before the 150k grid leak of the following stage), or even tack on the .0047 to the existing.

Custom from where? What sort of output section are you envisioning? Stew Magnetic Components would be building them, who does the iron for some very reputable amp manufacturers. I am thinking just a doubled-up Express output but perhaps with the LarMar type PPIMV (which is out of the circuit when c...