I want to see if I can settle a debate I'm I've had with multiple people (or perhaps start a new debate). If your tube amp is on, and you have no signal on the input (shorted to ground) can you switch the loads without causing damage? I get mixed responses, but one source has his PhD and has been building tube amps for 30 years...he says that as long as you can guarantee there isn't any signal it shouldn't matter at all. Then there are guys on the internet that say you shouldn't do this under any circumstance.  I'm inclined to believe that the few milliseconds of no load plus the time that it takes for switch bounce to subside shouldn't make any difference. What do you guys think?

Assume that make before break switches don't exist.

Sweet!

Thank you!

I've been trying to get my hands on a Sunn Beta Lead for years, but the few that pop-up on eBay are either in bad shape or priced way out of my pay grade.

Has anyone tackled a DIY version of the Beta Lead? Anything similiar? I really dig the very unique distortion that I haven't really found in another amp.

The 1N4148 are clippers, but the 4v zeners are as well?

I don't understand what the 4v zeners are doing. I'd be grateful if you can explain.

Quote from: Minion on October 19, 2011, 07:08:59 PM

I will eventually post the PCB artwork , stuffing guide and wiring diagram I just haven"t had the time to finnish the stuffing guide .....

Cheers

I wait eagerly!  :dbtu:

Thank you so much! Do you have it up and running? How does it sound?

Quote from: ENGR BUGO on October 11, 2011, 04:15:48 PM
I'll post maybe tomorrow my recently finished layout of this RG-100ES amp project files. Actually, a mix of RG-100ES preamp(green and red channels), Belton BTDR reverb, TDA7293 power amp, and power supply.

I await this anxiously!

No problem. We'll let Mensur decide if the layout should be made available here. Until then, I'll keep the link off of SSGuitar. It's available on other DIY forums if anyone is interested.

Quote from: LOBO on October 05, 2011, 03:26:53 PM
"Based"?
It seems like a copy without credits.

I fixed the word "based" to "using." There was no PCB layout for this anywhere so I paid someone to create one. I'm not making any money on this. What's the problem? The overall design(s) was taken directly from Randall...am I in the wrong here?!?

I removed the link.

Here is a semi-verified PCB layout using Mensur's schematic. Passes signal, but the tone stack doesn't seem right. Could be a fault in the layout or my build.  

Link removed due to complaint.

What charge pump was used to get 24v from 9v?

Quote from: joecool85 on April 12, 2011, 08:04:25 AM
I'm with Juan that you should just put a booster or OD/dist pedal in front of the amp if you need more gain.

According to Grady Champion (Dimebag's guitar tech), Dimebag would put an MXR EQ in front of the amp and crank the mids to act as a boost, but then he would scoop the mids with a Furman EQ in the FX loop. He said in an interview that there was so much gain that they needed to dial in a gate just right because if that gate opened you'd get howling feedback.

Awesome! Thank you for the help!

I'm showing my noob here, but what is the best way to wire up power for the power amp circuit plus a lower voltage "tap" (excuse my use of the word) for the preamp modules.

-Wire a 9v regulator in parallel with the power amp using the DC coming from the rectifier?

-Wire a 9v PSU in parallel with the rectifier using the AC coming out of the transformer?

-Wire a separate transformer in parallel to the other transformer using the AC from the inlet?

I apologize in advance if this is a dumb question, and your help is greatly appreciated.