6V6 line preamp

[Salas]

Is that considered wideband

1.5MHz on half vol pot is not narrow band either.

 

[buzzforb]

Was being sarcastic of course. I bloody love it. cant wait to listen to it with my new toy.

 

[stajo]

So what is the judgement on the audioband frecuency? Normal?

 

[merlin el mago]

Salas the line preamp can work with B+ 300VDC or max 310VDC?

 

[Salas]

So what is the judgement on the audioband frecuency? Normal?

What vol pot value you use? How much is it when at half position? That is in series with the grid and helps answering about the BW measurements.

 

[stajo]

Salas the line preamp can work with B+ 300VDC or max 310VDC?

I run my cathode follower on 250, it worx. Anodefollower need that and the v-drop over anoderesistor/choke/whatever. Then its a matter of taste. Vgeorge runs lower and is happy I think

 

[merlin el mago]

I run my cathode follower on 250, it worx. Anodefollower need that and the v-drop over anoderesistor/choke/whatever. Then its a matter of taste. Vgeorge runs lower and is happy I think

Wich gain have your cathode follower?

 

[stajo]

What vol pot value you use? How much is it when at half position? That is in series with the grid and helps answering about the BW measurements.

100 k log that measures 106,6 on 12th step if 21. The relation measures 5,46/100,1.. well in the region

 

[Salas]

Salas the line preamp can work with B+ 300VDC or max 310VDC?

Yes but use 6k8 10w anode resistor.

 

[Salas]

100 k log that measures 106,6 on twelfed step relation measures 5,46/100,1.. well in the region

How much is it to wiper at half position?

 

[merlin el mago]

Yes but use 6k8 10w anode resistor.

Only this change?

 

[stajo]

What vol pot value you use? How much is it when at half position? That is in series with the grid and helps answering about the BW measurements.

Dang its upside down so it was on 9th step of 21, that why.😱

Wich gain have your cathode follower?

0,83

 

[Salas]

Only this change?

Yes its enough.

 

[merlin el mago]

 

[stajo]

curve on pot max is maxing around 840 mV in bass region, slopes down to 703 at 10kHz, and 531 an 20 kHz

 

[merlin el mago]

Can be enough 5W for 6K8 or what power is necessary?

 

[Salas]

Can be enough 5W for 6K8 or what power is necessary?

10W is needed. You can use 2x15K 5W if you already have.

 

[Salas]

curve on pot max is maxing around 840 mV in bass region, slopes down to 703 at 10kHz, and 531 an 20 kHz

Pot max volume = zero resistance in series to the grid so the BW should be at its max. When pot is at low listening volume the BW should shrink. But never a slope in audio bandwidth across the full rotation.

 

[stajo]

Some pix on the beauty, Hows your workbench btw?

 

[merlin el mago]

10W is needed. You can use 2x15K 5W if you already have.

Thanks!!!!!!!!!!!!!!