New Quickie... but need help

[tominredbank]

Hi, jsut finished the Quickie and I need a litte advise. All voltages and resistances are to spec. But is it normal to have full voltage at 1-6-2-7- with rotary in off position?? When playing a cd and switched off the music stops( but voltage to those terminal remains 29v - 38v. I checked and double checked my work. Thanks.....tom

 

[Grainger49]

Here is a thread you should read all the way through:

http://bottlehead.com/smf/index.php/topic,1667.0.html

Post only resistances and voltages that are out of spec by more than +/-15%.  Post what you have and what it should be.

 

[mcandmar]

That is perfectly normal as the switch only turns the filament heaters on/off.

 

[tominredbank]

Thanks for the reply. I checked everything 3 times. Doesn`t that run down the batteries?

 

[mcandmar]

Apparently not as without the filament heaters no current flows through the tube, so its an open circuit in effect.

 

[tominredbank]

Thank you very much. It was driving me nuts! Tom

 

[Paul Joppa]

This one is not obvious, and not exactly intuitive. But it's an old trick used in battery radios since the early thirties, possibly earlier. You get to use a cheaper power switch, still important for a $99 preamp!