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Started by galaxiex, March 22, 2020, 12:56:07 PM
Quote from: galaxiex on April 12, 2020, 12:12:25 PMOk, more polishing the turd.... I just can't leave well enough alone. :duhI wasn't happy with the reverb sound of this amp.It's mostly due to the limitations of the single spring reverb tank.At almost any reverb setting it sounded more like a metallic "clank" than reverb.So I thought the way to get a more musical/realistic reverb sound, was to have some control over the frequency's being sent to the tank.I first tried the reverb tone network you see in the schematic,without the trim pot and no buffer. 2 X 51K resistors in place of the trim pot and output taken from the junction of them.This worked somewhat, but the tone network loaded down the circuit too much, reverb too quiet.So I took the volume buffer (from previous schematic) and swapped it to the tone network.Then adding the trim pot as a reverb tone control.This works great!The tone network adds a mid notch and the trim pot lets you roll off the highs.The boards are supported on solid core stiff wires.
Quote from: joecool85 on April 15, 2020, 10:11:41 AMGreat job! I always love seeing people make old gear work / work better. :dbtu:
Quote from: galaxiex on May 24, 2020, 04:34:15 PMBumping this cuz we seem to have reached the limitation of the tiny output transistors. The new 18VAC transformer and resulting 25VDC rail is just a bit too much for them. Playing the amp for more than 30 minutes at full volume causes the output transistors to go into thermal overload.At less than full volume I have not reached the limit... but this thing sounds so darned good at full. So options are...1. Better heatsinking on the output transistors2. Better (higher rated) transistors and better heat sinking.I'm leaning toward option 2 but might try cobbling up a better heat sink for the originals.I do have a couple of NOS T0-3 PNP Germanium transistors looking for a home...