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Balwin panoramic tone converter...
Balwin panoramic tone converter...
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Old 14th September 2021, 03:21 PM   #1
knockbill is offline knockbill  United States
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Default Balwin panoramic tone converter...

I got this at K'town last spring,, and figured its time to try and get it working!! I made an umbilical for it to try to power up with Hammond amp, or accordion amp, I've been playing with... I figured out the B+, and heater voltages,, but not sure how to connect it to an amp,, or what else it needs to operate... I have a reverb tank if it needs one...
I can't find any info on this online except for pictures,,, seems there are some Baldwin organ manuals available, but not many, and I don't know which organs this was used in... Anyone have a manual and can post the schem for this tone converter? Any chance the Sams or Ryder books have schems?


I powered up the tone chassis, and tried feeding a signal to each channel,, no joy... but there are two sets of wires coming from the same places on each channel, so I think there is an open connection that was controlled by a switch/pedal on the organ... I can try to trace the signal, and draw out the ckts,, but without the schem I may not be able build a switch/control... I built a few "controls" to activate the reverb etc on the Hammond amp, but schems are available for that one...
Gotta find someone with a manual I guess...
I'll bring the chassis to Kutztown this weekend, maybe find some ideas there!

Thanks...
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File Type: jpg P9110014.jpg (477.2 KB, 125 views)
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Last edited by knockbill; 14th September 2021 at 08:56 PM. Reason: Tried to correct Baldwin in title...
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Old 15th September 2021, 04:29 AM   #2
smoking-amp is offline smoking-amp  United States
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This looks to be a single channel version, with schematic:

Baldwin Panoramic Tone Converter - 1960's -12AX7 Tubes! | Reverb
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Old 15th September 2021, 05:28 AM   #3
PRR is offline PRR  United States
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Balwin panoramic tone converter...
You need the "necklace spring" hanging in the back of the organ. Top-right of first page of this PDF, or attached image. The two RCA jacks go to that. Audio goes from/to organ on the many-pin connector.

What you have is clever, sophisticated, and useless. Their delay-spring or transducers works above the audio band, 20kc. The box you have modulates audio onto 20kc carrier, sends that to the spring, returns and demodulates back to baseband.
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File Type: gif BaldwinPanoramic-necklace.gif (125.2 KB, 104 views)
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File Type: pdf BaldwinPanoramic.pdf (554.8 KB, 16 views)

Last edited by PRR; 15th September 2021 at 05:34 AM.
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Old 15th September 2021, 09:54 AM   #4
knockbill is offline knockbill  United States
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Quote:
Originally Posted by smoking-amp View Post
This looks to be a single channel version, with schematic:

Baldwin Panoramic Tone Converter - 1960's -12AX7 Tubes! | Reverb
Yep... mine is two channel... I'll try to read teh schems tho, first ones I saw online!!!!
Thanks
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Last edited by knockbill; 15th September 2021 at 10:05 AM.
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Old 15th September 2021, 10:02 AM   #5
knockbill is offline knockbill  United States
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Quote:
Originally Posted by PRR View Post
You need the "necklace spring" hanging in the back of the organ. Top-right of first page of this PDF, or attached image. The two RCA jacks go to that. Audio goes from/to organ on the many-pin connector.

What you have is clever, sophisticated, and useless. Their delay-spring or transducers works above the audio band, 20kc. The box you have modulates audio onto 20kc carrier, sends that to the spring, returns and demodulates back to baseband.
Thanks,,, good info,,, I saw pics of these in stand alone cabinets,, thought it may be something I can do with this one, for a tremolo preamp with a guitar amp... I tried to trace a signal thru it, and it gets modified thru teh first tx, which is attached to the stage plate of a 12AX7, but stops there...
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Old 15th September 2021, 01:13 PM   #6
smoking-amp is offline smoking-amp  United States
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Interesting use of the HF Carrier freq. I guess that keeps room acoustics from feeding back into the reverb line.

So probably one coil is for the Osc. stage, and then one coil each for the modulate and demodulate functions.

If the demodulate functions were freq. specific, it would allow them to use the same spring for two audio channels by using two different carrier freqs. But apparently the dual channel version is using the same Osc. for both channels, so two springs needed.

Would be a good application for a 6JH8 beam deflection tube as a synchronous demod. (Put the Osc. on the deflection plates and the signal thru grid 1. Then only carrier synchronous signal adds up on the beam selected plate.)

Last edited by smoking-amp; 15th September 2021 at 01:24 PM.
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