Quote:
Originally Posted by DragonSarc
thanks for the reply amp - so basicaly the more preamp you have the more gain you get? like the DSL/TSL amp has 4 preamp tube and has more gain than the 900 is that right? 
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Woops I can't believe I almost forgot the effects loop, that's got it's own tube which your 900 has. It's probably V1=gain, V2= effects loop, V3= phase inverter. Sometimes the last preamp tube controls the effects/loop, and sometimes the phase inverter, it depends on the model but that should give you a good idea of how it works. I'm not exactly sure how it's set up on the 900's but Coldsteal will probably know.
If the extra tubes are part of the gain stage than yes more tubes = more gain but more gain doesn't equal better tone!