Tube Amp Archive

Greetings. Thanks for the advice printer2. I don't know what effect on the overall tone of the amp the effects loop plays, but I'm willing to change that resistor. I've been setting volume to full, and adjusting the drive control to try to get the overdrive right. This is what has confused me. I hav...

Greetings. Thanks for the clarification about my posts. I'll try to watch that. I must re-iterate that I'm not convinced that pre amp distortion is bad. I just suspect that it is dominating my VHT amp. That EL84 sounded so bad mainly because I selected a Mullard Re-issue(made to break up early). Hel...

Greetings matt h. I guess that you take issue with my posting about the same related topics. I apologize if I somehow upset you. I hope that no one is forcing you to read my posts. However, I tend to be redundant in pursuit of knowledge. This is especially so when the replies that I get do not have ...

Greetings brewdude. Thanks for replying to my post. I DO have the exact same schematic, but I need to get it blown up so I can read it(poor vision). brewdude, I'm not as advanced in tube amp theory as you are. I don't know what "local NFB" is. Nor do I know what "snubbers" are. As far as 11 differen...

Greetings to ALL ! I am interested in how one would keep the pre-amp from distorting, and yet have enough gain to overdrive the output section of the amp. I am modifying a VHT Special 6 Ultra. The clean channel will NOT distort without a pedal. It has only 2 gain stages(1/2 of each 12ax7's). The Ult...

Greetings cxx. Hey buddy, thanks for the pdf link. I'll be using that in future posts for sure ! Did I understand that you feel that the pedal wasn't responsible for the distortion ITSELF(as in a distorting pedal), or that it wasn't responsible at all ? Using the pedal WITHOUT it's distortion contro...

Greetings guys. I hope that you guys are still watching this topic. I finally got my Ibanez Powerlead pedal(modified) back from my brother, and tried it out as I had mentioned. I hooked it up in the effects pedal loop and with "distortion setting" on zero, tone wide open, I was able to get real SWEE...

Greetings Firestorm, and John_W_PI. Thanks for the clarifications. Firestorm. I don't know if VHT changed the circuit. I do know from Rob Robinettes website(modding the Ultra) that some Ultras have R52 where R54 should be. So, I guess it's a possibility, but more likely that your take on the signal ...

Greetings Guys ! A lot of good info to think about. It's unfortunate that I don't presently have a scope. It is on my wish list. Thanks stevem for the advice on the cathode bypass cap. I write all of this kind of info down, or in this case print it off, as I am rather slow on the actual work of modd...

Greetings. I am EXPERIMENTING with, and modding a VHT Special 6 Ultra. My immediate goal is to have no pre amp distortion, only power tube distortion. I would like to be able to use the Clean channel to do this. Stock, the VHT's Clean channel will not distort, even at max volume, unless you use the ...

Greetings Colossal. I installed a new mosfet without incident. I'm sure that you are right about V1. I've tried 3 12ax7's there, and each time the noise level changed. I have a TAD installed right now, and the noise level isn't half what the amp had new. The stock tubes were black. You couldn't see ...

Greetings Colossal. Believe it or not, I have checked all of the usual outside offenders. The amp makes too much noise when no guitar is even plugged in. The choke that I installed lowered the noise by maybe a third. I made it almost tolerable by installing a TAD 12ax7 in V1. The clean channel is no...

Greetings to ALL. I am not sure that the title matches my queries perfectly, but here goes. I have VHT Special 6 Ultra, "made for modding" amp. The only mod I've done to it so far was to add a choke, which did lower the noise level considerably. My goal is to be able to play clean(on the clean chann...

Greetings to ALL. I hope I'm in the right place for this question. If it isn't, I apologize, and hope for a correction. My question is this : How does one make a quick link in a post. Example : A schematic for my amp, when I am posting about it. I am sorry to ask such a simple question, and I don't ...

Greetings to ALL. Wow ! What info to absorb. I really appreciate my fellow forum folks willingness to reply. I have read that the pi contributes to the over driven sound, but have never heard that it was the greater source of distortion than the output tubes. I have been checking out buying a small ...