Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: clyde on November 17, 2013, 05:46:37 pm

Title: Switching Problem
Post by: clyde on November 17, 2013, 05:46:37 pm

I have a double pole on-off-on toggle switch, 6 terminals, centre is off, and need to switch in 3 different resistors, trying to keep the largest value on the top throw, middle value in the off position (centre) and the smallest on the down position.  To make things easier the values can be halves of the largest, which will be 1M.  I've been puzzling and drawing for a few days now and can't seem to quite get it nailed down.  The resistors will be switched to ground.  Any takers?  Sorry for this head-scratcher. 

Title: Re: Switching Problem
Post by: tubenit on November 17, 2013, 06:27:46 pm

Look at the first posted schematic and at the first gain stage cathode.

http://www.el34world.com/Forum/index.php?topic=5621.0 (http://www.el34world.com/Forum/index.php?topic=5621.0)

With respect, Tubenit

Title: Re: Switching Problem
Post by: PRR on November 17, 2013, 08:26:29 pm

> middle value in the off position (centre)

No way to do that.

What you want is the switch in this top post of this thread:
http://www.el34world.com/Forum/index.php?topic=16290 (http://www.el34world.com/Forum/index.php?topic=16290)

Title: Re: Switching Problem
Post by: clyde on November 17, 2013, 08:47:54 pm

Thank-you gentlemen.  Yes that switch will do it, very obvious on first perusal.  I can do the switching with mine, but the positions won't be where I'd like them to be.