star ground for power tubes and ct, or soldered to chassis?

[elipsey]

My head just exploded. I absolutely, unequivocally HATE programming. My hat is off to those of you that can do that.

Programming is great. The machine almost always does what you told it (I'm still shopping around for one that does what I meant).

Analog is hard

[NateS]

I tell the younger guys... arguing with the compiler is like arguing with your wife. You're almost certainly wrong. But even if you ARE right, it STILL doesn't matter, because you're not getting anywhere until you make it happy.

[R.G.]

And remember one of programming's deepest maxims: almost always is almost always as good as always.

[Mick Bailey]

A Switchcraft jack can be isolated from the chassis by making the hole slightly larger. Slip a thin fibre washer over the thread and insert it in the hole. You now need a piece of PVC stripped from some hookup wire and poke a single turn (no overlap) in the gap. Put another fibre washer over the top and then the metal washer and nut. Even if the nut comes loose the socket won't contact the chassis.

Another handy hint; use half a lemon to remove rhubarb stains from pie crusts.

[Enzo]

Which half?

[big_teee]

Which half?

The Front half of Course!

[R.G.]

Actually, I'd use the right half for the majority of the stains, the the other half for whatever's left.

[g1]

But when you remove the stains from the crusts, they lose their "pie mojo".

[Alan0354]

Just let you know about my amp. I happened to just work on noise the amp today because I can hear a 120Hz slight hum after I put the rectifier for the front end. I have 4 stages of cascaded gain. Turn out that one side of the pilot light had solder splash that shorted to the chassis ground. I fixed that, remove the two 100 ohm resistor that go from chassis to both side of the filaments. I use a 100 ohm connect from chassis to the low side of the DC filament. I did have to use 5000uF across the DC filament......But 5000uF at below 15V is penny a dozen!!! You really need to listen to how quiet the amp is. I remove the input grid stop 68K or 33K that people automatically putting in without thinking...............That is the biggest hiss contributor. You should listen, as low as the hiss, the hum is lower than the hiss. This is one hell of a quiet amp..............AND I have 4 stages of cascaded gain!!!!

Grounding is just Fender grounding, no star, no nothing. I said all I can say and I absolutely stand by everything I said.

[Mick Bailey]

You really need to listen to how quiet the amp is.

How quiet an amp is tends to be pretty low down on the list for most guitarists. Ever heard Eric Johnson's setup? Tone, playing dynamics, flexibility and many other attributes come first. Perhaps for a bedroom player a super-quiet amp would be desirable, but for most live players noise isn't a problem.

[Alan0354]

How quiet an amp is tends to be pretty low down on the list for most guitarists. Ever heard Eric Johnson's setup? Tone, playing dynamics, flexibility and many other attributes come first. Perhaps for a bedroom player a super-quiet amp would be desirable, but for most live players noise isn't a problem.

But the subject here is grounding, that ONLY affect the noise. If noise is not important, why are we talking about it?

[Mick Bailey]

But the subject here is grounding, that ONLY affect the noise. If noise is not important, why are we talking about it?

You're the one talking about DC filaments and input grid stoppers to make a 'quiet' amp.

Grounding doesn't only affect noise, either. Amongst other things, a bad grounding scheme can actually improve noise.

[Alan0354]

You're the one talking about DC filaments and input grid stoppers to make a 'quiet' amp.

Grounding doesn't only affect noise, either. Amongst other things, a bad grounding scheme can actually improve noise.

Using DC filament and eliminates the grid stop serve as a reference on how low the noise the amp is to put the noise level into context. What is the point of talking about ground noise if you have the hissing of the 68K and the 60Hz hum from the filament?

Grounding is ALL about eliminating noise. Bad grounding occasionally lower the noise a little, but you'll never achieve the low noise level of a good grounding. And it's playing with fire as any further changes likely to bring out grounding issue. I fixed too many grounding problems to say this. This kind of amp grounding is very easy compare to grounding of a big system.

[Mick Bailey]

Grounding is ALL about eliminating noise.

It isn't, not by a long way.

Grounding is also about (amongst other things);

1. Operator safety in the event of a fault condition.
2. Ensuring low-impedance paths to maximise current flow and deliver maximum power.
3. Reducing EMR
4. Ensuring a low impedance path between signal ground and mains supply earth.

A bad grounding scheme can be very good for noise, but not necessarily for anything else.

[Alan0354]

It isn't, not by a long way.

Grounding is also about (amongst other things);

1. Operator safety in the event of a fault condition.
2. Ensuring low-impedance paths to maximise current flow and deliver maximum power.
3. Reducing EMR
4. Ensuring a low impedance path between signal ground and mains supply earth.

A bad grounding scheme can be very good for noise, but not necessarily for anything else.

Of cause, those are basic, we all assume we know that!!! Most people on this thread are amp designers. We don't talk V=IR here.