Sunn Sonic I-40

[Kelly Ames]

Would like to have one. Or build a clone if I could get the drawings. I know of a guy named John Wayland from a while back that had the pdf file from Conrad. Any one know his contact or anyone who has the drawings?

 

[abarson]

This older thread has some interesting information, specifically that the I-40 might be a rebranded 200S. That might help with sourcing schematics.
Soon owner of a SUNN Sonic I-40

Caution: tube amps have deadly voltages! You need to know what you're doing if you plan to safely build your own.

 

[Michedelic]

Would like to have one. Or build a clone if I could get the drawings. I know of a guy named John Wayland from a while back that had the pdf file from Conrad. Any one know his contact or anyone who has the drawings?

Which version are we talking about? The earliest ones, introduced circa '67, were 40 watts courtesy two EL34 power tubes, and it was mated with a single 15" cab. It was soon revamped(same front end…V/T/B, T&B boost)to 60 watts by way of a pair of KT88's or 6550's, which then made it identical to a Sorado, Sonaro, or 200s. The only difference, a wonky Sunn marketing move, was which speaker cab configuration it was paired with. There was a later, similar head, the 190B, which claimed a little higher wattage via some design tweaks. The entire Sunn line went from an angled woven grill cloth pattern to one somewhat Fenderish with rectangles, sometime in late '69.

 

[anderbass]

I used to have a mint condition Sonic I-40 head with 6550 power tubes.
I swapped it off to the guitarist in The Coconauts. Give him a shout, maybe he's ready to sell it...