The Watering Hole

The plan is to start the build on my 5watt single ended head about the middle of next month. I have a techy question that the likes of Dar and Howie (to name just 2) will relish.

I can't find the schematic for the  base build right now but I will and will post it if necessary, but the basis is this.

5 Watt single ended with tube rectifier and valve driven spring reverb. Master volume and a full 3 band EQ section. I have the space in the chassis to add an extra valve and therefore an effects loop either now or in the future.

I also have space in the chassis for 1 extra control pot which I was thinking of using for a twist to the EQ curcuit.

If I put in a 3 position rotary switch, I can switch between three different sets of caps/resistors to give a HUGE range of EQ/voicing to the amp. Add to this the fact that I'm planing on putting in a bias pot and measuring points and I'll have an amp that will neally rival a Univalve but with extra's.

My question is...What cap/resister values would you use to give a wide range of tonal differences but with enough overlap so that position 1 blends into position 2 and then into.......You get the idea.

Your thoughts would be appreciated

Spud.

Andy,

I'd love to see the schematic and layout once you have it ready.  Sounds like a VERY nice FULL featured amp.  

To answer your question, without getting too complicated, a single position on a 3 way rotary switch, can usually only provide one one R-C network per switch position.  Here is a great tool to use when you want to build an RC filter (just in case you don't already have this link)  http://www.muzique.com/schem/filter.htm

That said, a simple R/C filter won't provide a full "revoice" of the amp.  Assuming the amp has a nice tone stack, you could provide a couple variations of a voice, but I don't know if it would be enough to be worth it.  Have to think on that more.  

Might want to consider some other options instead.  A negative feedback switch. Gain switch...  something like that.  Sounds pretty versatile as it is.