Hey all! I just found an 88 key fixer upper in need of a new lid! Not the case lid but the plastic part that goes over the harp and such. I'd appreciate some leads as to wear to find one!
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Show posts MenuQuote from: sean 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
Quote from: beginnersluke on November 07, 2019, 11:27:03 AMAny way you could point me in the right direction for this? Also some of the keys are still sticking in the low end I think due to the key bushings, what should I do?
Vibratio is definitely nice.
Many people upgrade the amp to a new one (which would solve that problem).
If you've lubed the action, you should go through the whole regulation procedure (lost motion, let off) if you haven't already.
Quote from: Tim Hodges on September 20, 2018, 07:06:06 AM
You want to buy a 18v DC power adaptor with enough current to power the piano.
The CP70b only takes 40ma so go with something higher than that. All the aftermarket supplies I see online use 500ma - 600ma so they provide more than enough power.
Quote from: goldphinga on December 21, 2018, 02:42:38 PM
Its an original student piano, customised by Custom Vintage Keys. https://www.facebook.com/cvkeyboards/photos/pcb.947548978769320/947548948769323/?type=3&theater