Author Topic: Wurlitzer 200 Audio Input  (Read 257 times)

Offline EauClaireGuy

  • Fiesta Red
  • **
  • Posts: 14
    • View Profile
Wurlitzer 200 Audio Input
« on: July 13, 2020, 01:30:01 PM »
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!

Offline pianotuner steveo

  • MIDI Mark V
  • *****
  • Posts: 3457
  • A keyboard player in love with vintage guitars!!!
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #1 on: July 13, 2020, 04:24:33 PM »
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?
1960 Wurlitzer model 700 EP
1968 Gibson G101 Combo organ
1975 Rhodes Piano Bass
1979 Wurlitzer 206A EP
1980 Wurlitzer 270 Butterfly Grand
2004 Hammond XK3
2009 73A Rhodes Mark 7
2009 Korg SV-1 73
2017 Yamaha P255
2020 Kawai CA99
....and a few guitars...

Offline EauClaireGuy

  • Fiesta Red
  • **
  • Posts: 14
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #2 on: July 13, 2020, 06:30:19 PM »
200

Offline Jenzz

  • Sparkletop
  • ***
  • Posts: 94
    • View Profile
    • http://www.tasteundtechnik.de
Re: Wurlitzer 200 Audio Input
« Reply #3 on: July 14, 2020, 02:16:03 PM »
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

Offline sean

  • Mark II
  • *****
  • Posts: 887
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #4 on: July 14, 2020, 05:04:29 PM »

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


Offline pianotuner steveo

  • MIDI Mark V
  • *****
  • Posts: 3457
  • A keyboard player in love with vintage guitars!!!
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #5 on: July 14, 2020, 07:05:33 PM »
Ditto. That's the way most of us have been doing it all along. (Using Aux out)
« Last Edit: July 21, 2020, 08:51:22 AM by pianotuner steveo »
1960 Wurlitzer model 700 EP
1968 Gibson G101 Combo organ
1975 Rhodes Piano Bass
1979 Wurlitzer 206A EP
1980 Wurlitzer 270 Butterfly Grand
2004 Hammond XK3
2009 73A Rhodes Mark 7
2009 Korg SV-1 73
2017 Yamaha P255
2020 Kawai CA99
....and a few guitars...

Offline EauClaireGuy

  • Fiesta Red
  • **
  • Posts: 14
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #6 on: July 23, 2020, 10:46:46 AM »

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?

Offline pianotuner steveo

  • MIDI Mark V
  • *****
  • Posts: 3457
  • A keyboard player in love with vintage guitars!!!
    • View Profile
Re: Wurlitzer 200 Audio Input
« Reply #7 on: July 23, 2020, 05:44:33 PM »
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?
1960 Wurlitzer model 700 EP
1968 Gibson G101 Combo organ
1975 Rhodes Piano Bass
1979 Wurlitzer 206A EP
1980 Wurlitzer 270 Butterfly Grand
2004 Hammond XK3
2009 73A Rhodes Mark 7
2009 Korg SV-1 73
2017 Yamaha P255
2020 Kawai CA99
....and a few guitars...