Gemini II questions

[dragonworks]

I have owned V4s and VT22s but never and older Ampeg. I recently bought a Gemini II off CL and met the gent halfway. He assured me everything worked and that it just had been worked on. Well, you hear the speaker hum but that is about it. I opened it up and sure enough it has been worked on. All new caps cobbed into the power supply etc. I fiddle with amps a bit and have a scope and generator etc. My main problem at this moment is I can only find 2 schematics. One shows 6L6 output tubes and the other shows 7591s. This amp has the 6L6s in it. It has an old sticker in it showing the tube complement as 6L6, the sticker reads Linden N.J. The coupling caps shown for the 6L6 are .1 mf but it has the .02mf caps in it for the 7591s? I am not sure what is going on here. One shows a full wave rectifier and one shows a half wave rectifier? The amp is missing the voltages for the plates etc in the preamp section, I am wondering which schematic to work off of.
Any help would be greatly appreciated.
Thanx
Dragonworks

[dragonworks]

guess I will ask elsewheres?

[Hangman]

guess I will ask elsewheres?

I'm not sure I have ever seen a Gemini II schematic with 6L6s. Where is the schematic you found with 6l6s?

If the preamp tubes don't have any b+ voltage, that seems pretty strait forward. Just follow the power supply. Where is the last power supply node that you measure voltage?

[dragonworks]

I haven't got into the amp that much yet. Someone recapped the power supply and there are about 10 caps in there and it is a rats nest. I am going to cut them out and get the can cap and put it in. Here is a link to the schematic with the 6L6s, http://www.unofficialampeg.com/schematics.html
Also I am learning how to troubleshoot amps and am not that great at it yet although I have fixed a few.
There is 59 volts DC on the filiments of the preamp tubes, that is how screwed up it is after whoever worked on it.
Thanx for the response.
I am beginning to think whoever worked on this amp was working from that schematic? Where they got an old sticker showing a tube complement with 6L6s in it that reads Ampeg Linden N.J. is a mystery? As I stated I never owned an older ampeg but have seen lots of em and I never saw any with 6L6s in them?
Took a look inside again, it is a full wave rectifier, 4 diodes. I don't have much time during the week to do anything. I see they have the can cap at Antique electric supply. Am waiting for a certain electronics engineer to get back to work on Monday and we will both take a look at the schematic and go from there.

[johnnykuz]

I have 7 old Ampeg amps ranging from a '58 Jet to a '69 Gemini 20. The Gemini 20 is the only Ampeg I have ever seen with 6L6's, every other Ampeg I have has 7591's including the '67 Gemini II (G-15) that I recently purchased. You did not indicate the year of the amp in your original post so I'm at somewhat of a loss in terms of whether or not 6L6's are oddball in your amp.

   

[Hangman]

Joe piazza's schematics are redrawn have been known to have mistakes and are in my opinion terrible. The original ampeg schematics are much better.

I've never seen a g-15 Gemini II with 6L6s either. My guess is that Joe just assumed it was the same as the GV-22 which does actually have 6L6GCs. The truth is that it isn't, similar, but different

[Hangman]

More likely the he thought it was the GV-15. again, really similar, but different.