Hi folks,
I just finished a Surfybear Spring Reverb clone and am not really content with the volume/gain of the reverberation path. There's a huge volume drop when I turn the mix knob slightly up. It's the third build on the same PCB/schematic but the first time this happens.
The JFETS are mmbf5457 measured according to specifications given in a former build documentation from the surfybear forum with a Peak Atlas DC75 (Vgs(off) <-1.2V; gfs >3,5 <5 mA/V).
Here's the schematic with the voltages. Do you happen to find anything suspicious?
Thanks!
(https://i.postimg.cc/ZKwLZcnN/Schematic-Voltages2023.png)
(https://i.postimg.cc/fJ0dfYxW/Schematic-Voltages2023.png) (https://postimg.cc/fJ0dfYxW)
Hey Lars.
What does it sound like at C8?
Might be a cap in the tone stack?
TC my friend.
Rich
Hey Rich,
I will check this out!
And I again realise how "impedance-thick" I am. The original reverb tank has an imput impedance of 8 Ohm and an output-Z of 2250 Ohm. My new unit has 10 Ohm in, 2575 Ohm out. The off-precentage seemed to be absolutely OK to me. But could this make such a difference?
I'd have gone with the specs near enough.
Hope you find the issue.