Tube Mini-Booster ?

[petemoore]

  Of course, but does it behave anything or a lot like the Jfet version ?
  Gave up on the Hybrid Reverb idea [actually the wires on the tranny I had were so short one pulled out when I tried to strip it .akm. so that ideas shorted].
  I almost have a tube minibooster..9 pin socket with power supplies close by and an amp right there too !
  Here's what I'm thinking...valve Jr. with 2 input tubes.
  12ax7 [a] being gain stage, full 12au7 being for the Mu amp, 12ax7 being a cathode follower driving tone control or tonestack.

[snoof]

I'd love to see the MB adapted for tube use, sounds interesting.

[Krinor]

Very interesting.
Let's see what you're working on. 

[Dragonfly]

I'd love to see the MB adapted for tube use, sounds interesting.

Actually, the MB was adapted FROM tube use ! 

[DougH]

Yeah, just look up "cascode" or "SRPP".

[petemoore]

Actually, the MB was adapted FROM tube use !
 Yupp..Jfet's are cool like that.
 I'm thinking of putting what could be sort of like the 2nd 1/2 of the BSIAB on the front end of a Valve Jr. headclone.
 Sacrificing 1/2 of the input gain stages for a buffer to drive the tonestack, having the Mu section bypassable...but I'm none too sure about bypassing tube gain stages at the associated HV's.
 ^That'd be a gain stage >/mu amp>/ buffer-tonestack, amp.
 The next block diagram would be ordered such as:
 Mu amp [with grounded input bypass arrangement] > gain stage, buffer-tonestack, amp.
 or
 12au7=Mu amp [w/grounded input BP] >12ax7=Buffer tonestack, gainstage, then amp.
 The latter seems pretty good.

[petemoore]

  I guess I'm wondering about the theory or if anyone's had experience with the sound of a tube mu amp driving an output which distorts well otherwise.
  Channel mixer was an idea, however the existing preamp is non-inverting, mu amp inverts..so it'd be one or the other or both.
   Liking the sound of the amp as is, ..lots of options..
  So I'm a little vague on how exactly to wire it.
 

[amz-fx]

For anyone who has the Analog Music Projects Newsletter on my web site, there is a schematic of a tube mini-booster in it.

The patent that is referenced on my mini-booster page is more of a SRPP circuit and not exactly a mu-follower type of circuit. There is a copy there for downloading 

After messing around with the tube MB, I decided that mostly it was a waste of a triode section to use that circuit instead of the standard common cathode amplifier    There's not much to be gained with the more complicated two-tube circuit.

regards, Jack

[petemoore]

  Spare tube socket...lol.