Fender Deluxe Reverb AA763 vs AB763

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markmain

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#1
I found the best version that I could find of the Fender Deluxe Reverb AA763 and then cleaned it up to make it more clear. Here is the link:
http://www.filedropper.com/deluxereverbaa763

I compared the AA to the AB, a few differences, but not much; 1.5K resistors were added to the grid on each of the 6V6GT tubes, which is a nice safety feature.

The two Tone capacitors (normal and vibrato) increased from .033 uf to .047 uf.
The Reverb resistor increased from 4.7M to 3.3M.
The Phase Inverter resistors changed from 27K and 100K to 22K and 82K.
The Tremolo resistor increased from 56K to 100K; and notice the schematic is also slightly changed around the 12AX7 connections--what would this change do?

In comparing the AB to a 1977 Deluxe Reverb I noticed most changes were with the addition of a ground cord and the Stand-By switch moved so it's now between the caps and the transformer.
 
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#2
I think the only difference on the tremolo wiring is where the grid of the amplifier portion (the right-side of the 12AX7) gets tapped. In the aa763, it appears to be tied directly to the grid of the oscillator whereas in the other it's tapping off one of the CR filters, so I think it's just going to be a 60 degree phase difference between the AA763 and AB763, which I don't think would have any effect on the function.

But I'm a noob and I could be completely wrong.
 
#5
markmain said:
I found the best version that I could find of the Fender Deluxe Reverb AA763 and then cleaned it up to make it more clear. Here is the link:
Free File Hosting - Online Storage; Upload Mp3, Videos, Music. Backup Files

I compared the AA to the AB, a few differences, but not much; 1.5K resistors were added to the grid on each of the 6V6GT tubes, which is a nice safety feature.

The two Tone capacitors (normal and vibrato) increased from .033 uf to .047 uf.
The Reverb resistor increased from 4.7M to 3.3M.
The Phase Inverter resistors changed from 27K and 100K to 22K and 82K.
The Tremolo resistor increased from 56K to 100K; and notice the schematic is also slightly changed around the 12AX7 connections--what would this change do?

In comparing the AB to a 1977 Deluxe Reverb I noticed most changes were with the addition of a ground cord and the Stand-By switch moved so it's now between the caps and the transformer.
Click to expand...

I don't know why the link doesn't work.
What do I need to do differently?

Thanks.
 
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