Odyssey Power Amp...

[thyx]

...does anybody have a schematic or layout for one of these little beasts?

BTW, nice to see the board humming again.

[thyx]

Specifically, I'm looking to find out how the 12BH7 is set up. Is it similar to the way the cathode driver in the SSS is?

[M Fowler]

Not much out there on this amp. Not sure if they are real Dumbles either.

[Auralalchemy]

...does anybody have a schematic or layout for one of these little beasts?

BTW, nice to see the board humming again.

I don't know but I will sell you the one in the bottom pic for $4500. It's sitting right here at the end of my couch.

[selloutrr]

..

[boldaslove6789]

Can anybody glean enough info to make some sort of layout/shemo out of the Odyssey posted above? This would be very cool to have to go with any D-style amp.

[txbluesboy]

Looks to me like it's driving the power tubes off the plate, not the cathode, of the driver tube.

[thyx]

Looks to me like it's driving the power tubes off the plate, not the cathode, of the driver tube.

Yes it is...and I suspect it (the 12BH7) is being driven by a 12AU7 PI. After pooring over the photos, it's basically a Twin Reverb output but with a PI/driver setup (like a Dumbleland) and a Master Volume at the PI input.

[glasman]

To me it looks like

Tube 1 - Gain Stage and cathode follower.
Tube 2 - PI
The rest PA section.

Not much to replicate.

start with a fender PI and PA and roll your own Gain/CF

Gary

[Max]

Hi,

AFAIR:

V1 = 12 AU7 = Phase Inverter
V2 = 12BH7 = Driver
V3 - V6 = 6L6

Cheers,

Max

[boldaslove6789]

Thanks guys

[glasman]

Hi,

AFAIR:

V1 = 12 AU7 = Phase Inverter
V2 = 12BH7 = Driver
V3 - V6 = 6L6

Cheers,

Max

Common cathode driver stage??

[groovtubin]

should be close!

[Max]

Hi,

AFAIR:

V1 = 12 AU7 = Phase Inverter
V2 = 12BH7 = Driver
V3 - V6 = 6L6

Cheers,

Max

Common cathode driver stage??

Hi Gary,

AFAIR Alexander Dumble used a PI > driver structure in a lot of his amps. Here's another example from Rob Livesey's page: http://personalpages.manchester.ac.uk/s ... 086872.jpg

Cheers,

Max

[txbluesboy]

should be close!

That looks right to me except you omitted the (.1?) coupling caps between the 12K plate resistors and bias mix resistors.