PC Based Oscilliscope for Tube Curcuits

[trobbins]

I just use whatever soundcard is in the pc or laptop. I did once knock out a cheap sound card about 5 years ago - luckily I wasn't using a laptop at the time ;-)

 

[denny9167]

I really appreciate all the advice,this was very helpful. One more question. How close are spice simulators to real world testing? I'm sure there are a lot of variables,but not positive,since I've never used spice simulation.

 

[mace1337]

Buddy of mine just bought one of these DSO Nano V2 - Pocket-Sized Digital Oscilloscope - SparkFun Electronics and he's very happy with it.

I have a Tek 2247A which I got for free at work, I consider myself very lucky with that.

 

[d a o]

PicoScope 4262 is especially made for analog circuits

Hello and thank you

I am thinking of buying such a scope

 

[TheGimp]

The accuracy of the Spice simulation is directly related to the accuracy of the models.

Some models are better than others. I've had problems with screen current not modeling properly at low currents. Other than that, most models I've found on the web are pretty good.

Spice is a nice tool for playing 'what if', but it will only take you so far before you have to build the circuit. Simulations can point out gross errors, but don't really tell you anything about how it sounds if there is nothing really off.

I made a model of the 6P41S using a java program from :

Model Paint Tools: Trace Tube Parameters over Plate Curves, Interactively

I thought it was totally screwed up as it showed grid bias at -32V. When I built the amp, I was surprised to find the model was very accurate.


My 6DX8 model wasn't as good.

 

[regal]

Hello and thank you

I am thinking of buying such a scope

For the PicoScope 4262, Can you really proble B+ with it? Is there a 100x proble that works with it safely ?

 

[d a o]

For the PicoScope 4262, Can you really proble B+ with it? Is there a 100x proble that works with it safely ?

Hi,

with the 4262 kit I ordered comes with a MI007 60 MHz x1 / x10

If you want more signal attenuation so these must here be bought extra for
http://accessories.picotech.com/active-oscilloscope-probes.html # TA041
25 MHz x10 / x100

http://accessories.picotech.com/active-oscilloscope-probes.html # TA057
25 MHz x20 / x200

What do you mean by B+ ?

 

[TheGimp]

B+ is the High Voltage Plate supply, usually any where from 200V up to 600V. It can go higher in extreme cases.

 

[Irakli]

Apart from audio waveshape, I mainly use TrueRTA for instant frequency response, and spectrum analysis.

You can make a pretty simple above-audio oscillation checker by hpf, rectifying and filtering for a dc level.

TruRTA can't do X-Y plot very important drawback IMHO.

 

[regal]

Originally Posted by trobbins


You can make a pretty simple above-audio oscillation checker by hpf, rectifying and filtering for a dc level.

What rectifier do you recommend, I imagine some would be bandwidth limited?