6V6 line preamp

[stajo]

New spectrum measures over 100k load.

 

[Salas]

Building this preamp is no different for grounding or system noises as in doing it for any other preamp. Its a matter of solving individual build or system issues. Nothing special.

 

[Salas]

New spectrum measures over 100k load.

Is there a test signal frequency in those plots?

 

[stajo]

Those are my settings

 

[stajo]

Building this preamp is no different for grounding or system noises as in doing it for any other preamp. Its a matter of solving individual build or system issues. Nothing special.

Another way of saying my grounding tech sucks

 

[stajo]

Another. Full volume and chokes on cathodes

 

[Salas]

What is "Sveplage"? Sweep?

 

[stajo]

Radiotron has a somewhat better paper then RCA with bigger curves (accuracy I have no clue). I printscreened them and did some plots in my tubes working. They run 20,1 bias at 274 V. Heres my loadline, almost superlinear (100 pixels in each direction +/- 5 v)

Ill post an empty one to if you guys are up to paint and loadlines

 

[stajo]

What is "Sveplage"? Sweep?

Yep. Your good at swedish

 

[Salas]

Is there any chance just 1kHz poking up if you deselect sweep? Because now only 1/F near zero sticks up.

 

[stajo]

It doesnt seem to matter that much now for some reason. Ill club the Minecraftplayer to sleep now. Hope to wake up after, this is fun

 

[Salas]

You don't drive the pre input from the Pico gen also? Just sampling the pre output to Pico scope when in spectral mode?

 

[stajo]

Yes, I had the gen to left channel in and pickup to left out. Curve responded when i moved on gen probe so I think it worked

 

[flatheadmurre]

Stajo you are welcome "down south" and hook it up to my HP3562 then you can take non reliable equipment out of the picture.

But i still think you have to find the source of your headache.....

A HV lab powersupply is another good tool when playing around.

 

[iko]

Friends don't let friends use picosucks. Oops, sorry, picoscopes.

 

[stajo]

Flathead is nice and Iko is mean

Elvis is asleep so tell me if you want me to do some other measures. The Mighty One asked for some clipping level. How do I measure that with my excellent tools?

 

[stajo]

Talking about a fool with a tool. I had the probes on x10. Heres a new

 

[Salas]

Flathead is nice and Iko is mean

Elvis is asleep so tell me if you want me to do some other measures. The Mighty One asked for some clipping level. How do I measure that with my excellent tools?

You drive out of the Wavetek a sinewave (1kHz is OK, probe 1x) to pre in and you scope the pre's output on the Hameg. You start low on the Wavetek output knob and you wind it up until you see the sinewave start chopping off to flat top. Then you back down just a hair before the clipping. You read the screen divisions times the V/div switch. Then you state to Zen Mod "That X voltage is my max VPP".

 

[Salas]

Another nice signal for that is triangle where you can see the points exactly. You have your pre volume pot to max. Wavetek 182 has a max output of 20VP-P.

 

[buzzforb]

Talking about a fool with a tool. I had the probes on x10. Heres a new

Thank you. I don't feel so alone