Huh... Trying to upload some pics and I get the error that says, "Error: Image cannot be posted from the passed link."
Weird. Hyperlink works on the browser, but somehow I can't get it into this post. :(
<img src="https://thepitchingmachine.com/TheGearPage/1960TV/Pic_05.jpg" alt="Cabinet">
So I am in the midst of completely refinishing a very, very beat up 1960TV.
I’m at the step where I removed the staples that affix the piping that goes around the baffle board. They appear to be 22 gauge staples with a 3/16” crown and 3/8” legs.
So I go to TubesAndMore to order new materials...
I had a Bogner 412 Slant with V30s that was not too bass heavy, thus, I’m guessing you have a straight cab.
Also, is it on casters? If not, I’d add those and get it off the floor. I bet it’ll solve your issue!
Amp works perfectly otherwise. Will reseat all valves when I get home in a few days. Have additional preamp tubes to roll, but doubt it’s preamp tube noise because it doesn’t increase (in volume) with the master volume control.
Thanks for the suggestion to go line out. I’ll try that.
MPEG-4 iPhone recording
I have a 4-5 year old Mesa TC-50. When I power it on, let it warm, take it off Standby, it makes this sound with a guitar plugged in to the amp input and the guitar volume off.
The volume of the noise does not seem to be affected by the master volume. The amp might be...
Interesting. It's apparent to me that these things weren't meant to be biased (kind of like I hear a lot of Mesa Boogies are). I can think of times over the past 10 years when I'd bring this into my tech (I've owned 4 or 5 X100B amps) and he'd charge me for biasing when I got new tubes.
Wow, thanks Mark. I might try to install a bias pot instead of R126, then.
I've got this one on hand:
Looks like it's 1/2 watt. Do you think that would do the trick?
I think they're pretty much the same, but the first one is a "clearer" vectorized .pdf. The 2nd one is a rasterized .jpg or something (even though the file type...
So I've got this old 80's Carvin amp (this pic shows the amp pulled from a 1x12 combo). The amp is an XV-112 which is the same circuitry as the X100b head.
You can see here I made a tube current tester for biasing the amp. If you measure voltage across a 1-ohm resistor there in the aluminum...
I've never seen the DVD, but I've got a few of his books. I also like to read other peoples' books and educate myself as much as possible. Then, the way I see it, you can go one (or more) of three routes when you want to start testing/fixing away:
1.) Mess with your own, existing amp
When you run shielded wire in an amp, do you connect the shield to anything? Like, John said above, I'm running shielded wire from my input jack straight to a grid resistor, then to the grid of the first 12ax7 preamp tube (pin 7).
Do I have to connect the shield to ground on each side of the...
Interesting, that's the opposite of what I've read. I'll have to pull out some books.
On page 307 of Gerald Weber's book "Tube Amp Talk for the Guitarist and Tech," in the chapter titled, "Everything you always wanted to know about transformers (but were afraid to ask)," it says:
"If you run...
At the very least it'll make your tubes wear out more quickly. At the very worst, who knows, maybe your tranny will overheat or something.
In general, I think, you'd rather have the mismatch the other way around (i.e., run a 16 ohm cab). Hopefully someone else who knows more than I do will...
Thanks for your help. I did some preamp tube testing/swapping today after reading books by Dave Hunter, Gerald Weber, and some other dude. It was the first attempt I ever made to hear the difference between preamp tubes.
I have a Soldano Decatone and first tried swapping V1 with these three...
I'm not sure if you've got an DMM (digital multimeter), but if it were me, I'd wire everything up and, when I'm done, measure the resistance on the plug that plugs into the back of the amp.
If it measures close to the impedance of your speaker cabinet, then you're good to go and all the wires...
Can anyone shed light on these tubes? Any info would be greatly appreciated.
This tube says "Pro/Comm" on it. Never heard of that badge, but I'm guessing the "Made In Germany" can help someone identify it. Approximate age or other name brand equivalent? I assume that bent pin on...
My Bogner 4x12 slant cab is supposed to be one of the best made. I was recording something with my American Deluxe Ash Tele on clean channel with a 100-watt 6L6 tube amp and the thing made a horrible rattle at a single frequency.
I had to give up using that cab on that particular recording...