6
votes
1answer
126 views

What is the nature of the signal between an electric guitar and an amplifier?

I can't seem to find information on this, but what are the properties of the signal passing through the guitar cable? What I mean is, if I were going to make a pedal of some sort, what sort of input ...
5
votes
1answer
184 views

Can turning on an amplifier without a connected load (cab) cause damage?

I don't recall where or from whom, but I heard that switching on an amplifier head without a connected load (a cab, that is) may cause damage—presumably to the tubes, but perhaps something else, I'm ...
7
votes
4answers
855 views

How to connect a line signal to a guitar amp?

My Laney Lv300 Tube Fusion Combo amp, doesn't have a Line-In, as such. It merely has one "Input" on the front, for the guitar and a pair of FX sockets, as an FX Loop (FX Send and FX Return). It also ...
4
votes
3answers
277 views

Tracking down hum in several amplifiers in a home studio

In my home studio I have several amplifiers: Fender Blues Junior III (guitar combo, all tube) Gallien Krueger MB150E (bass combo, solid state) SWR Studio 220 (bass head, tube preamp) Alesis RA 300 ...
0
votes
1answer
333 views

Electric guitar amp won't switch to distortion channel

I have a Peavey Classic 30 combo amp (tubed). There's a channel switch button on the amp that is meant to toggle between the clean and distortion channels. However when I attempt to toggle from clean ...
2
votes
2answers
682 views

How to modify Trace-Elliot Velocette amp to make it more suitable for use with bass?

I have a Trace-Elliot Velocette that I'm very satisfied with. This amp works very good also for recording bass, but the low notes will be much less sturdy when recording through this amp than if I ...
3
votes
3answers
155 views

Buying a guitar amplifier from another country

A while back (before stackexchange) I read that it's not recommended to buy an amplifier from a country with different electricity (110v 50hz vs 220 60hz) because the circuits will create a different ...
9
votes
9answers
921 views

What are the advantages of point to point (PTP) wiring?

What are the advantages of having a pedal or amp that is point to point wired as opposed to one that is built on top of a printed circuit board? Are there any disadvantages of PTP?
5
votes
4answers
1k views

Bad sound from amp

I get this really bad feedback sounding noise when I play stuff like this, from the beginning of the Free Bird solo, shown in tab: 1 ----18---18---18--------- 2 -18---18---18--------- (All notes ...
14
votes
1answer
2k views

What is a “death cap” ?

I have often heard/read people mention a "death cap" when talking about older Fender amps. Is this a capacitor ? What does it do ? Why is it called the death cap ?
10
votes
1answer
421 views

Balanced triodes. Gimmick, or worth the money?

When purchasing tubes from some reputable dealers, I have noticed that you are given the option for balanced triodes--sometimes at a much higher price. How does a tube with balanced a triode effect ...
18
votes
4answers
1k views

When should I be concerned about calibrating the bias of vacuum tubes in an amplifier?

I think it would be useful to discuss the concept of bias as it pertains to guitar amplifiers. I have read some articles saying that you should always rebias your amplifier when you change the power ...
10
votes
2answers
2k views

What do the different tubes in an amplifier do?

Preamp vs Phase Inverter vs Reverb vs Power vs Rectifier. Many people get really, really confused when they try to understand anything about tubes. I spent a very long time myself trying to ...
21
votes
5answers
19k views

How do I know when it's time to change a tube on my amplifier?

I think this would be a wonderfully instructive question to people who are new to tube amplifiers. In short, how do I know that it's time to change a tube, and what's a good strategy for figuring out ...
12
votes
1answer
3k views

What changes in the amp when I adjust its presence?

The tone controls on a guitar amp are pretty obvious, but what does the presence knob affect? It's a subtle effect but can sure make or break a sound. It doesn't seem to be treble or midrange boost, ...