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reduce the hum Before replacing your pickups I'd definitely shield the cavity and back of the the pickguard - some adhesive copper tape is a cheap fix if it helps. I'm not sure of the severity of the problem but it is possible you might have some noise from a bad earth/ground too so whilst...

This is not an original or RI but rather a close approximation put together by me. Though my brother has the RI and it does have the bellycut also. Don't know if all the originals had a bellycut but from those I've have seen, they have it. I usually play strats and I find the 72 deluxe as a...

72 deluxe

Hi I've just recently heard a speaker that I really loved..... it was a 12" Goodmans audiom 12P-G. Problem is they're not made anymore (to my knowledge - not for a long time). If I come across a good condition 2nd hand one I'll get it but I'm just wondering if anyone else knows about these...

hmmm.... some of this is still a bit beyond me but I get the concept and I've come along way since I started on this amp a few weeks back. I think in a way I kind of fluked getting my amp to where it is with quite a bit of experimentation and some good advice on this thread pointing me in the...

It may be due to poor quality tube as stock but the 12at7 sounds 10 times better. of course the ax7 is a little louder and has more gain but it is more brittle and colder sounding. the at7 is sooo much nicer, rounder and warmer. All my voltages and bias measurement is okay. Unfortunately I'm off...

Yeah I don't think I'll be putting any more money into this thing. It's a good little practice amp as it is but I don't think it will ever get loud enought to gig with - unless it's mic'd up. Do you guys think yours are? Also, to buy speakers and transformers over here (in Australia) is much...

I don't think it's the bypass cap because I tried everything from 1000uf down to the 0.47 and the level was around the same. Maybe it's about as loud as it gets? I'm interested in the 1uf bypass caps on both preamps - what positions are these caps?

mods so far.... I've bypassed the opamp (jumpered d10 to r2/c25 junction to get to pin 7, top of vol pot to junction to junction of r15, r29 and c28, middle of vol pot to r27 to get to pin 2 and bottom of pot to grnd) changed c1 to 1uf - after trying many values. Helps control the farty...

miscellaneos cap and resisor values - effect of change hi again all Now that I am pretty happy with my amp I am just wondering about a couple of tweaks. Can anyone tell me if I change R1 to a 1megohm (R2 is removed) if I will expect an increase in signal -and what impact would this have on...

Well it looks like changing the bypass capacitor does do the trick. I didn't have a heap of caps at hand but tried a 33uf. Actually seemed worse but then switched to a 3.3uf and guess what, flabby bottom end gone! Is 3.3uf too low? I still plan to experiment and I haven't yet checked my voltages...

great... I'll give that a go! thanks Ryan

yeah that's pretty much what I got just pushing the boundaries slightly with 250 ohms to help with the sound a little. Not sure why I have to run it so hot to get rid of the 'farting' though. 100ohm resistor sounded good but just ran the tube too hot.

without rechecking, i think, I had something like 319 volts between plate and cathode (taken from pin 7 to 3), 11 volts for the cathode resistor. That's with 250 ohms resistance. (screen is estimation). then i plugged my numbers into the tool below to get my plate dissipation (and to save me...

can't handle bottom end I've completed all my mods and the amp sounds great - better than anything else in it's class, except for one thing..... when I have the amp and guitar cranked and hit the E-string or power chord (especially on the neck pickup) the amp gets really 'farty'. I've messed...

sorry, i've probably confused you a little because i'm still learning all this.... the past week has been a steep learning curve for me. I will definitely try to learn the theory in the next few days for the most appropriate way to deal with the the bias. (I have a bias measurement tool on the...

Wow.. I think you read my mind. I was researching biasing throughout this thread last night. I have done all of my modding except for the bias which causes me some clipping from when the amp is cranked and heavily over driven. My other mods have left my amp sounding awesome. Thanks again for...

I think most people regretably know that the guitar brands they dearly love are large corporate money making machines these days and it's just another marketing strategy to make money. It just hurts and makes me scratch my head to think why Gibson would do such a thing that most guitarists would...

beautiful... but pricey! think I would make one rather than spending this much dough. making it is half the fun.

Yeah I love the sound so much - hits me right in the soul bone. I want to get more into playing slide and think there's no better way. Watched your clips... I was just in memphis about a month ago - back in Australia now. Wish I had of seen something like that there. And everyone has a website...