Sunn Concert Lead Guitar Head

This 1975 Sunn Concert Lead is in great shape for it's age.  A few marks in the tolex covering and some acid bleed on the chrome. The clear red plastic piece on the power switch is missing.
It works great. So much so I forgot to turn down the lead channel volume before hitting the switch, BAM.
Reverb and tone knobs work and are clean.
I cleaned the pots with some Deoxit and for now no scratching.  I also checked inside for loose wires and mice.  Looks relativly clean (Pictured) and I found the date stamp.

About the amp:

The Sunn Concert Lead is a guitar amplifier head that has gained popularity among musicians for its powerful and versatile sound. Here are some key features and facts about the Sunn Concert Lead:

Key Features:

• 400-watt solid-state power
• Two separate channels with 1/4-inch inputs and a 1/4-inch speaker cable output
• Ultra-clean or dirty tone with verb
• Massive and punchy sound
• Built to last, with a reputation for being rugged and reliable

History and Legacy:

• The Sunn Concert Lead has been used by many famous musicians, including John Entwistle of The Who
• It’s known for its ability to produce a wide range of tones, from clean and crisp to dirty and aggressive
• The Concert Lead has been praised for its massive and punchy sound, making it a favorite among many guitarists