The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
The following are some pictures of my Jester Oahu JU-28:
Saturday, January 31, 2009
The Jester Oahu JU-28 Amp Inspiration: 50's Valco Oahu Amp
I came across a 50's Valco Oahu Amp ad in Ebay. This 50's amp is obviously the model that Jester Enterprises used as basis for the Jester Oahu JU-28 Amp.
The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
The following pictures are from Ebay and not mine. These will be taken off this blog if advised by the Owner of the pics:
Subscribe to:
Post Comments (Atom)
2 comments:
Great pix, cool site.
I have an old Valco Oahu amp, same as the one you picked up on Ebay. I am looking for a schematic of the amp, you happen to have one?
Right now, the amp has a major loss of gain on both channels unless you strum your guitar strings really hard. The amp will kick into a nice loud distortion for a second and then go back to a low clean. It also hisses and pops a lot. Any ideas? Could it be a bad power tube or bad rectifier perhaps?
Hi guitman423,
Thanks!
Sorry I did not catch your post early. You probably already addressed your amp's issues by this time.
The Jester Oahu JU-28's circuit is very close to the Gibson GA-6 Lancer/GA-14 Titan schematic. Jester modified the front end in the JU-28 so that the 4 inputs have different voicing.
The closest schematic I found in the Valco/Supro line is the Valco Model 510-24 minus the 'Tremolo' effect and one 'Tone Control' and the use of a different power tube (6973 instead of 6V6). In fact, when I tried to trace the schematic of the JU-28, I used a print-out of this schematic as a starting point.
I would guess that your amp would be similar to the Valco Model 510-24 as well w/o the 'Tremolo' and less one 'Tone Control'.
The Valco 510-24 amp is the basis of Turretboards Model 24 kit amp. This is one of those amps widely speculated to be used by Jimmy Page in early Led Zep recordings.
The schematics (GA-6 Lancer and Valco 510-24) are readily available online.
Please post pictures of your amp here if possible.
Thanks again and congrats on your newish old amp. Cheers!
Post a Comment