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Re: power selection switch, question/ choice.


 :
4/15/2000 12:10 AM
Bryan James
 Re: power selection switch, question/ choice.
good points ;)  
i ordered the transformers this morning should have them early next week. so be expermenting by next weekend  
 
here is the current design that i have, which is useing the cathode switch to remove the tubes.  
http://home.james-gang.org/bjames/output_stage.gif  
 
sorry that the switch set up is hard to see.  
also hard to see is the Post PI MV  
and i've decided to use a 12at7 instead of an ax7 for the pi  
 
the darker/muted sound is probly not what i want.  
 
basic the amp is just going to be a power amp for anything i want. (weather guitar, keyboard or cd) the preamps are going to be seperate.
  
4/15/2000 12:35 AM
steveR
Looks cool!  
 
Couldn't you use 1/2 a dpdt switch AFTER the 1R resistors?  
 
If you also used a rotary switch for speaker impedance selection I think you could use the other pole of the dpdt switch to automacally switch to the proper secondary tap since the required load will appear to double when you turn off half the tubes.  
 
Just a thought...  
 
steveR
  
4/15/2000 12:44 AM
DIRTY L KARLSSON
You´ve read my mind.  
 
DIRTY L KARLSSONhttp://artists.mp3s.com/artists/74/slide_man.html
  
4/15/2000 6:33 AM
Bryan James
If you also used a rotary switch for speaker impedance selection I think you could use the other pole of the dpdt switch to automacally switch to the proper secondary tap since the required load will appear to double when you turn off half the tubes.  
  
 
see i knew there was a reason i wanted to have someone else look at it. great idea on the switch there.  
 
still woried about the input though but i think that should work.
  
4/15/2000 1:40 AM
dale
as the last guy said, it's a pentode/triode switch. and tho i've never used a boogie 1/2 power switch, i 'd say thats the better method, as the triode pentode changes the sound dramatically. however, if you happen to like that sound then obviously the t/p switch is the way to go. but i've never heard anyone say they like it as much in the 1/2 power or triode setting. i myself don't either.  
 
dale
  

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