Here's what Cioks have to say about the 7050 Flex 7 DIN Plug:
Type 7 Flex cable is blue and fitted with a straight 2 pin DIN plug. This plug type was widely used in older loudspeakers but the only pedals we know which use this standard are eight older vacuum tube pedals from Electro-Harmonix all intended for powering with 12V AC. This Flex cable is available in 50cm length only.
The eight Electro-Harmonix pedals where the blue type 7 Flex should be used are:
- Hot Tubes
- Tube Zipper
- The Wiggler
- Black Finger
- LPB 2ube
- Tube EQ
- English Muff’n
- 12AY7 Mic Preamp
All eight draw less than 800mA and can be powered of a single 12V AC outlet of the AC Rider, AC10, CIOKOLATE or now discontinued AC8 where all these units have the needed blue Flex cable included.