Can you please look into the schematic and let me know what you think? Thanks a lot. Detailed schematic shows 4 halves for the pre-amp on the top (V1 and V2) and two halves in the middle on the right side that feeds the power section (V3). I have 3 supposedly high quality Tube Store 7025 called Preferred which I think means they selected from a bunch to be their best ones for strength, clarity, etc. V1 is shared as input tube, V2 added for the drive mode, and V3 as phase inverter. ![]() Looks like the reverb is not related to the tubes. I'm attaching Delta Blues block schematic as well as detailed schematic here. You don't want to swap that tube out for a different gain value because you'll also be changing the reverb sound as well (could be too weak, or too strong/harsh). If you decide to start tube swapping various positions, you really need to know what each half of each tube does in your amp: for example, sometimes 1/2 of a tube is used as a reverb send or return. ![]() I have never had a 12AT7 (even NOS) sound good in V1 (or any position that "makes tone")- they are thin sounding. ![]() However the AT7 isn't really a "tone" tube, it's more of a "function" tube- it's used alot for phase inverters and reverb pans. ![]() AY7 can also be good, less gain than 5751.
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