Is correct this input arrangement ?

[kagliostro]

The connection of the 1M resistor at the input is odd to me 

The 1M resistor is permanently connected to the signal path and ground and never disconnected by the tip in on the input jack

is this a typo or really the schematic is correct ?

to me the 1M resistor must be connected to ground and to the signal path via the tip on the input jack and this connection confuses me

 

K

[DummyLoad]

it will work.


the balance control changes the plate loading and thus varies the gain of the second triode when in cascade mode.


the 1M grid leak at the input is just like fender/marshall etc. 


--pete

[sluckey]

That's exactly the same way I do all my single input amps. The 1M is never disconnected by the jack switch in any amp I've looked at. Do you have an example of what you are talking about?

[kagliostro]

Thanks Pete & Steve

it will work.

same way I do all my single input amps.

What didn't works correctly is my brain, I focused my memory on one of the jack intake of the double input amps

and refused to remember the other

 

I hope it was late here yesterday when I asked 

Many Thanks

Franco


p.s.: BTW it will be interesting to join this schematic with the latest work by Steve

[sluckey]

kagliostro - do you have a copy where all the words are readable?

What's not readable? I can see that from 20 feet away. Did you forget to click on the pic to see the full size?

[mresistor]

didn't realize it was clickable   sorry    meanwhile I found it .pdf on the web    thanks