Dynacord - Federhall 1960  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
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borislavgajic
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Post by borislavgajic »

please does someone have schematic for this spring reverb...?

https://reverb.com/ca/item/13111710-dyn ... 960-s-rare
dynacord federhall.jpeg
dynacord federhall 2.jpeg
dynacord federhall 3.jpeg

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borislavgajic
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Post by borislavgajic »

here are guts.....it seems that it is all wet sound...?
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Post by modman »

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Post by bow_and_error »

I have a similar tank, and this is one of only 2 circuits I've seen that uses a high input/output impedance tank with grounded input & output connectors. The other is the Nonlinear Circuits Big Room Eurorack module (based on Polyfusion VC Reverb). The high impedance of these tanks requires a lot of drive current, so they usually have higher voltage PSUs than more common lower-impedance tanks. So keep that in mind if you need to find a replacement PSU.

Here is the decoded tank information:

Dynacord Spring Reverb Tank - #4FB2A1C
Digit - Specification
1st - Reverb Type - (4) - Type 4
2nd - Input Impedance/DC Resistance - (F) - 1,475/200 Ohms
3rd - Output Impedance/DC Resistance - (B) - 2,250 Ohms/200 Ohms
4th - Decay - (2) - Medium (1.75 to 3.0 s)
5th - Connectors - (A) - Input Grounded/Output Grounded
6th - Locking Devices - (1) - No Lock
7th - Mounting Plane - (C) - Vertical, Connectors Up

You can still find replacement tanks if needed.

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