The 835 is a great amp, as are all of the amped amplifiers of this era. You are right in wondering if any two 835s are the same. Ampeg was a pretty small company at the time and substituting parts that were on hand for ones that were not, was not uncommon, also the owner Everett Hull was always having the factory do weird custom modifications for customers. So if a customer wanted an 835 with different features, he would make that happen. The customer got what the customer wanted.
I would approach the schematic as a general reference, perhaps the first rev of the schematic, just realize that many factory made amps did not match that schematic and are still considered “right” or “factory”.
I have a 435-SN, and the schematic and amp are totally dissimilar on the front end. They ended up using different tubes, fewer gain stages, etc...
What is the date code for your 835?
Sorry for all the spam in the 50s amped forum. Spam can be hard to keep up with. Every once in a while they robots get ahead. Hopefully it is good for a while.
I would approach the schematic as a general reference, perhaps the first rev of the schematic, just realize that many factory made amps did not match that schematic and are still considered “right” or “factory”.
I have a 435-SN, and the schematic and amp are totally dissimilar on the front end. They ended up using different tubes, fewer gain stages, etc...
What is the date code for your 835?
Sorry for all the spam in the 50s amped forum. Spam can be hard to keep up with. Every once in a while they robots get ahead. Hopefully it is good for a while.