Wurlitzer 200 Audio Input

[EauClaireGuy]

Has anyone ever messed around with running audio into the Wurlitzers amp? Im curious as to what it would take to make that happen. Also curious about if anyone has ever installed an fx loop in their wurly? Thanks!

[pianotuner steveo]

I don't recommend messing around with that due to the high DC voltage needed at the reed bar. I'm sure there is a way to safely do that, but it would require properly adding jacks and then you would have the issue with how to mix the sounds.

What model do you have?

[EauClaireGuy]

200

[Jenzz]

Hi .-)

I think you mean the audio input on the PCB (the 2 soldering posts beneath the cinch tone bar input)?

This one was intended to use with a dynamic mic at the 207 models.

Jenzz

[sean]

Eau Claire,

Vintage Vibe has a reasonably readable copy of the wurly schematics online:
https://cdn.shopify.com/s/files/1/0666/2821/files/Wurlitzer_200_and_200A_Service_Manual.pdf?8872610067384662061

Go down to page 43 and 45 and right click and select "rotate clockwise."

The schematic on page 43 shows you the resistor values that Wurlitzer used for a voltage divider to provide "tape in" aux; and with no resistors, it would be "microphone in" or "phono in" (without RIAA EQ).  Note that this section of the circuit is isolated from the high-voltage (low current <0.3mA) on the harp by capacitors 55 and 58.

The diagram on page 45 shows you where the connection terminals (3) and (1) are on the left side of the board next to the RCA jack.  (Note that the diagrams for the 200, on page 40 and 42 show the board upside down, so the "mic in" terminals are on the right side, next to the RCA jack.)

If you really are going to carve up your wurly to add an effects loop, you could lift one end of R45 out of the pc board, take the "send" signal from the end of the trimmer pot, build a buffer amp to bring it up to the level that works with your effects, and then just return the signal to terminal (3) through the "tape in."  You could use a switched TRS 1/4" jack (Switchcraft 13b or 14b) to take the effects loop in and out of the audio path, and use an effects loop Y cable.  That doesn't sound super-convenient, just to add phaser, flanger, or delay through the on-board speakers.  I would leave it as-is and use the AUX out and an external amp.


Sean

[pianotuner steveo]

Ditto. That's the way most of us have been doing it all along. (Using Aux out)

[EauClaireGuy]

Eau Claire,

Vintage Vibe has a reasonably readable copy of the wurly schematics online:
https://cdn.shopify.com/s/files/1/0666/2821/files/Wurlitzer_200_and_200A_Service_Manual.pdf?8872610067384662061

Go down to page 43 and 45 and right click and select "rotate clockwise."

The schematic on page 43 shows you the resistor values that Wurlitzer used for a voltage divider to provide "tape in" aux; and with no resistors, it would be "microphone in" or "phono in" (without RIAA EQ).  Note that this section of the circuit is isolated from the high-voltage (low current <0.3mA) on the harp by capacitors 55 and 58.

The diagram on page 45 shows you where the connection terminals (3) and (1) are on the left side of the board next to the RCA jack.  (Note that the diagrams for the 200, on page 40 and 42 show the board upside down, so the "mic in" terminals are on the right side, next to the RCA jack.)

If you really are going to carve up your wurly to add an effects loop, you could lift one end of R45 out of the pc board, take the "send" signal from the end of the trimmer pot, build a buffer amp to bring it up to the level that works with your effects, and then just return the signal to terminal (3) through the "tape in."  You could use a switched TRS 1/4" jack (Switchcraft 13b or 14b) to take the effects loop in and out of the audio path, and use an effects loop Y cable.  That doesn't sound super-convenient, just to add phaser, flanger, or delay through the on-board speakers.  I would leave it as-is and use the AUX out and an external amp.


Sean

I guess I was more looking just to add a 1/4 in just because I thought it might be fun to run a guitar through the amp. Mine used to be a 206, would it be detrimental to add a 1/4 in to the "Mik" input that used to be there?

[pianotuner steveo]

I don't want to chime in on that one, my expertise is more on the piano end than the electronics end.
Sean, what do you think?