Hello Edward!
On 25 Dec 97, Edward Arndt wrote to Al Thompson:
 EA> After reading this, I had to look at the schematic from my Super.
 EA> It's not like the original Super Reverb, which is what I wanted,
 EA> but the print says '93 Super/Concert.
I checked out a couple of the '95 Concert series amps and they sounded great.
 EA> This is supposed to have
 EA> the 59 bassman chassis as well, along with the original 4x10.
 EA> It's looks like the power supply is completely solid state including
 EA> rectum-fryers, regulators and zenor diodes.
You'll probably also find that in the Bassman reissue, as well as most other 
non-boutique amps except perhaps Mesa.
 EA> Also notice some
 EA> solid state diodes in the final output it looks to be for output
 EA> safety.
Yup.  John McIntyre included them in his rebuild of the Princeton called the 
"Prince 'O Wails".  Three in series on each end of the output tranny's input 
side to prevent the plate voltage from going negative.
 EA> The channel /reverb switching section seems to have some
 EA> quite a few diodes and even a couple 4560 IC's...
Carvin is the only (non-boutique) company that I'm aware of that currently 
uses 100% silicone-less circuitry, using relays for channel and reverb 
switching (I'm not sure about their rectifier) in their 50 and 100 watt tube 
amps.  Using relays is a great way to say you have no silicone in the amp, 
but for applications where the signal is not being amplified or EQ'd, I think 
FET switching is more reliable.  Relays can stick, and the switching can be 
noisy. Interestingly enough, the Blues Deluxe and DeVille used relay 
switching.
 EA> All the components seem to be well identified and documented except for
 EA> the transformers which only indicate Fender part number.
Which is all you need for repairs.  You can always measure the voltages if 
you're curious.
 EA> The actual amp section is all tube, with the final 12AX7A driving a
 EA> pair of 6L6GC's.
The Blues Junior is the same with the exception of the FAT circuit.  The FAT 
switch activates an FET that is tied to the cathode of the first 12AX7.
I'm still debating whether or not to do something with the extra triode, or 
buy a second BJ and use it as a project amp.  This thing sounds so sweet that 
I really don't want to mess with it.
C-ya! Rich
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