SAE "X" Series
I started out intending only to collect the "X" series gear that had the optional black face instead of grey, but I can't control myself. I decided to collect both grey and black.

SAE R-3 Rack 

1. SAE X1P Preamplifier Power Supply

2. SAE XBP-1 Filler Panel

3. SAE X1P Preamplifier

4. SAE XBP-3 Filler Panel

5. SAE X25A Amplifier

6. SAE XBP-5 Filler Panel

7. SAE X10A Amplifier w/ optional black face

8. SAE BP-5 Filler Panel

I just obtained and second X-25 amp. You will notice on "X" series components that you will see two different shades of grey anodizing. I don't know if this was intentional or a quality control issue but I am trying to find out.

This is the power cord tag for the "X" series

This is my latest acquisition:  a T101 AM/FM Tuner with a silver/gray anodized face plate to match the "X" series amps and pre-amp thus making it an "XT101". Now I have to track down the XE101 Equalizer.
 

I have acquired a black faced X10A. Now I have to locate the rest.
 

This is a picture of an X15A amplifier with an on/off switch (also on the X10A). Due to European regulations enacted in the early 1980's, preamplifiers were not allowed to have the switched outlets with the higher amperage ratings required for amplifiers and therefore audio manufactures had to re-tool any amps that did not have on/off switches in order to export them to Europe. Some of these amps can be found stateside because Pacific Stereo also requested the on/off switch on the "X" and "01"units they sold.