5D3 with tremolo

[Leevi]

I have been adding a Vibrochamp type cathode tremolo to a 5D3 circuit and after several tries the best point
seems to be the PI cathode.


http://el34world.com/charts/Schematics/files/fender/Fender_deluxe_5d3_schem.pdf
http://el34world.com/charts/Schematics/files/fender/Fender_Vibrochamp-AA764-schematic.pdf


Since the voltage raises on the cathode too high on full intensity the tremolo signal will dampen quite heavily.
I have balanced the situation by decreasing the 1.5K PI cathode resistor to 1K.
Do you think this will cause some bad consequences sound wise?


/Leevi

[66Strat]

IMO, the best option would to adapt the 5E9A tremolo to the 5D3 circuit.
http://thevintagesound.com/ffg/schem/tremolux_5e9-a_schem.gif
You might try tying the PI cathodes togther and use a common 750 to 820 ohm bias resistor. Interject the LFO signal to the joined cathodes.

[Leevi]

I don't see a big difference between Vibrochamp and 5E9-a tremolo.
Furthermore I have made some changes in the tremolo circuit in order to prevent thumping.

You might try tying the PI cathodes togther and use a common 750 to 820 ohm bias resistor. Interject the LFO signal to the joined cathodes

Might be worth to try

/Leevi

[tubeswell]

How did you find the result?

[Leevi]

How did you find the result?

~OK, maybe not the strongest one but a useful tremolo. I had to tune the intensity down in order to prevent thumping.
A  22n  cap from the plate of the tremolo tube to its cathode eliminated the rest of the thumping.


/Leevi