G7 finished!!!!!!

[frob]

what capsule did you use? i cant get the ck12 in the states.

 

[dukasound]

[quote author="frob"]what capsule did you use? i cant get the ck12 in the states.[/quote]

In this mike I used SoundKing SKEE106

 

[dukasound]

Hi
What about underheating EF86 :?

 

[ward]

Sorry for hijacking your thread Duka,
I'll start a new one

 

[dukasound]

Did anyone who build G7 check phase in realtion with another mikes?
I check and with Sennheiser and AKG is out ot of phase.
It is not problem but where we made mistake.

 

[Gus]

reverse the output wires on the transformer.

 

[dukasound]

[quote author="Gus"]reverse the output wires on the transformer.[/quote]

OK. Thanks

 

[Gus]

Or you could usea DPDT switch at the power supply box wired as a phase invert.

 

[dukasound]

[quote author="Gus"]Or you could usea DPDT switch at the power supply box wired as a phase invert.[/quote]

Thanks Gus but I wanna know excatly transformer polarity on this
circuit and for cathode follower (I think vica verse).

 

[dukasound]

Is this right transformer polarity?

 

[Marik]

[quote author="dukasound"]Is this right transformer polarity?

[/quote]

It is right... for cathode follower design. With anode followers (i.e. G7) you have to invert polarity in the trafo. So + of trafo goes to pin2, and - to pin 1.

 

[dukasound]

It is right... for cathode follower design. With anode followers (i.e. G7) you have to invert polarity in the trafo. So + of trafo goes to pin2, and - to pin 1.[/quote]

Now I am confused. This is for anode folower circuit. Watch marker (polarity) on transformer. On G7 (maybe I am wrong) we have invert polarity.
On 1538 input is pin 5 (6 and 8 are grounded) and 4 and 1 are plus and 3 and 2 are minus.