I have never yet found a Gibson amp that exactly matches any one schematic available for that model. I've never personally tested the gain indications from that particular schematic.īe glad you're not dealing with Gibson. In cases like that, it's important to have the judgment that comes with experience with electronics to figure out what actually makes sense. It's uncommon for Hammond, but it does happen. You do occasionally find errors on schematics. In Joey's case, his A-100 schematic shows the necklace reverb that was only used on A-100s in the first year of production, after which they switched to the new spring tanks. If you didn't know this, you might assume that B-3s and A-100s had different vibrato circuits. Hammond organ B3 Preamp electronics Circuit schematic Diagram, Hammond schematics, B3 Hammond circuit schematics. I’ve read various things saying that adding notes on a Hammond gives a compressed type of sound because of the way the extra tones are added (so for example two tones aren’t x2 louder, but only x1. It appears on the A-100 schematic simply because that schematic was drawn at a later point. That vibrato circuit is shown on the A-100 schematic, but applies to all the 3-series organs. The sound fading away is the signature of a tube filament dying out. This paragraph is the key to your problem. Previous Post Bacon Phat Next Post How to oil a Hammond B3 if the organ has trouble starting properly. For example, the most common B-3 schematic shows the vibrato system used on B-3s in 1955 and does not show a running change that occurred in 1957. This is the original Hammond organ manual and is relevant to all B series organs, BV, B2 B-3, & CV, C2, C-3, and A. So there I was, ripping out a solo during a practice on my 'new' Hammond C2 organ and the sound falls away and gets soft to the point of no volume in the span of about 15 seconds.

The key to using schematics appropriately is to understand the relationship between the schematics and the actual instruments. Hammond manufactured these organs over many years with a number of running changes, so it's not that surprising that there are a number of different schematics drawn showing those changes.

Hammond organ schematic