Help identify Circuit boards from a guitar shop.

musicalstash

I picked up these circuitboards from a guitar shop which was clearing out their workshop, long shot but can anyone help identify them.? 

Hoping they are a guitar pedal boards but think they may possibly from a hobby kit. 

https://ibb.co/D4Yqqnk

https://ibb.co/7nrmQjk

https://ibb.co/Y2ShNK4

impmann

Deffo not pedals. One has markings for +30v.

HerrMetal

Fostex LR16 Digital Mixer ? Hence the MXR for Mixer rather than the pedal company.

Danny1969

These are old ... looks like late 70's to mid eighties to me. Almost all discrete circuits, can only see 1 IC, the rest of it is transistors. 
If it was from a mixer than I would expect to see a dual supply, not a single 30V   

So not really sure but expect @ICBM will soon be along to identify it correctly  

thermionic

The layouts of most of them with the “L O/P” & “ R O/P” legends strongly suggest something with stereo outputs.

ICBM

Danny1969 said:

These are old ... looks like late 70's to mid eighties to me. Almost all discrete circuits, can only see 1 IC, the rest of it is transistors. 
If it was from a mixer than I would expect to see a dual supply, not a single 30V   

So not really sure but expect @ICBM will soon be along to identify it correctly  

Not certain what it is, but you’re in the right ballpark - the type of board, lettering and components look mid/late-70s to early/mid-80s, British made, probably from some sort of stereo preamp or something. The HQ MXR 29 boards with the circular L1 and L101 (multi-tap choke) symbols look like a stereo 5-band graphic EQ.