|
|
Guitar Discussions -> Competent Explanation Vox "Valve Reactor" Amp Circuit
There are 2 messages in this thread.
You are currently looking at messages 1 to 2.
|
Competent Explanation Vox "Valve Reactor" Amp Circuit - George Orwell - 11:16 07-12-05
|
|
There's a 60%-off sale on these amps this month at GC, so I
bagged a VR30 (AKA VR30R) to put into a bookshelf next to my
bed. It's OK -- a little NOISY like all the cheap Vox amps --
but it fits the space (with room for convection cooling and
sound reflection from the open back), survived burn-in and is
nice looking. I have to say that Vox sure gets the look down if
nothing else, right down to the "VOX by Wharfdale" sticker on
the ack of the Chinese speaker. ;-)
http://media.zzounds.com/media/brand,zzounds/VOXVR301-
b5afc15b0b2ea3325c5fa763d11f45b7.jpg
[That's a GIANT .JPG!]
For the life of me, I can't quite make heads or tails of the
"Valve Reactor" concept. As I gather it, contrary to usual
"hybrid" amp circuits, this amp has pure solid-state preamps
(two channels with two different overdrive circuits in the
second) which go into an intermediate stage using the two halves
of a 12AX7 dual pentode as a tiny power amp [Class-A? AB? What?]
and then runs the output of this valve micro-power-amp into a
_second_ power amp, a straight solid-state.
Do I have this right so far?
You wind up with a two-channel amp with no less than four (4)
gain & volume knobs.
I don't quite get the object of he exercise here, and I don't
find it in any of the pages I've searched: Is the idea to be
able to get the full tube amp power-stage breakup at any volume,
or exactly what? That's all I can figure out.
Thanks for any competent help with this question.
|
|
|
|
Re: Competent Explanation Vox "Valve Reactor" Amp Circuit - claudel - 12:13 07-12-05
|
|
In article <aa10044f60d236eaf7ae4f01010355b3@mixmaster.it>,
George Orwell <nobody@mixmaster.it> wrote:
>There's a 60%-off sale on these amps this month at GC, so I
>bagged a VR30 (AKA VR30R) to put into a bookshelf next to my
>bed. It's OK -- a little NOISY like all the cheap Vox amps --
>but it fits the space (with room for convection cooling and
>sound reflection from the open back), survived burn-in and is
>nice looking. I have to say that Vox sure gets the look down if
>nothing else, right down to the "VOX by Wharfdale" sticker on
>the ack of the Chinese speaker. ;-)
>
>http://media.zzounds.com/media/brand,zzounds/VOXVR301-
>b5afc15b0b2ea3325c5fa763d11f45b7.jpg
>
>[That's a GIANT .JPG!]
>
>For the life of me, I can't quite make heads or tails of the
>"Valve Reactor" concept. As I gather it, contrary to usual
>"hybrid" amp circuits, this amp has pure solid-state preamps
>(two channels with two different overdrive circuits in the
>second) which go into an intermediate stage using the two halves
>of a 12AX7 dual pentode as a tiny power amp [Class-A? AB? What?]
>and then runs the output of this valve micro-power-amp into a
>_second_ power amp, a straight solid-state.
>
>Do I have this right so far?
>
>You wind up with a two-channel amp with no less than four (4)
>gain & volume knobs.
>
>I don't quite get the object of he exercise here, and I don't
>find it in any of the pages I've searched: Is the idea to be
>able to get the full tube amp power-stage breakup at any volume,
>or exactly what? That's all I can figure out.
>
>Thanks for any competent help with this question.
>
It's a reasonably successful attempt to warm up the modeller...
<http://www.voxamps.co.uk/products/valvetronix/vtoverview_inside_story.htm>;
Claude
|
|
|
|
1 |
|