Precious Tones Sapphire 2022

This is a philip sayce machine. Needs no pedals. I have a unique version with a four selection voicing switch in the back. First selection is vintage blackface, the second is blackface and sapphire blended, third is full sapphire, and the last is srv diaz mode.

From the manufacturer:

The Sapphire

The best amp you can find for the SRV kind of tone....

ABOUT THE AMP

You were looking for an organic connection with your guitar amp, you need to start with a great clean tone. The SAPPHIRE is a single channel amp design, with bold and full-bodied clean tones.

 
This amp sounds really open, revealing and offer a unique tonal breath. You will feel the sound on your fingertips!
 
Tone stack allow you to adjust the three treble middle bass pots for a great deal of flexibility when dialling in.
 
Most of the tone stack tend to have a cut in the mids so we created a setting called « rough » this pot allows you to minimize the effect of the tone stack.
 
What makes this amp special is that the rough pot will cause the tone stack to have less and less effect as the rough pot will make the mids level up till you have a completely flat tone stack which will also help the amp to crank. 
The rough pot is a “push pull” switch that allows you to pull to totally defeat the tone stack and the amp will be more aggressive, distorted and louder. 
 
One of the amp’s qualities is also the tube driven reverb circuit.
 
The effect is full, deep and we tune the desired level of the reverb effect by ear while testing the amp before delivery.
 
 
The amp is equipped with a bunch of switches that allows you to experiment with different configuration such as :
 
Cathode- fixed bias
High or Low B+ 
Penthode or Triode mode
Different Negative feedback values

6L6 powered 40W (6550,kt88,6v6)

Pre- amp, reverb driver and phase inverter 12AX7 and 12AT7 can be adapted to taste
Single “clean” channel
 
Settings are:
Volume setting Treble middle bass Rough tone and reverb
 
Tube powered spring reverb
Push pull volume bright switch
low high B+ Switch
Cathode Fixed Bias Switch
Penthode Triode Switch
Negative feedback Switch
 
2/4/8 ohm speaker output
 
Selected input and output transformers
Selected Reverb Tank
Fixed Bias Setting fully accessible and made to be done by yourself 
Custom Made Painted Aluminium Chassis (2 mm)
 
Hand made Tolexed laminated wood cabinet
 
 
 
Size cm: W51 x H30 x D24
Weight: 14 kg

Descrption

Specification

High- and low-tension switch, offers you to choose between two main B+ supply tension as High will be the normal tension and low will give about 50 volts less on the anode of the power tube and center tap of the output transformer as also less tension to the pre amp tubes.

 
With this switch you can travel through sound that is less aggressive, smoother, sweeter or growling cleans straight in to your face, tight and lots of dynamics…
 
and even brighter and sparkling if you use the “push pull” switch hidden on the volume pot. 

We also implement a negative feedback switch that allows you to have 3 different feedback as Low, High and Normal.

 
We decided to use this mod since the Fender always had different values of the resistors on the feedback line due to the different speakers impedance value, so you would see the same circuit with different value because speakers would be 2, 4 or 8 ohms. 
 
We thought let’s try this and see if we feel that the difference is interesting enough to make us implement a switch… and it was! 
 
So we did it, it is really interesting to mess around with the switch …