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Thread: Baldwin Panoramic Tone Convertor

  1. #1
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    Baldwin Panoramic Tone Convertor

    I've gotten hold of a Baldwin Panoramic Tone Convertor with the spring tank. It's missing the power supply and has a broken switch. A co-worker was kind enough to test the tubes, draw up a pinout diagram for the round octal 'P.T. POWER SOCKET' connector, and calculate his best estimate for the proper voltages. Could anyone with a bit of organ experience give their take on the accuracy? I'd like to build a suitable power supply and try using this effect in the mix.




    The broken switch appears to be a rotary-style DP3T. One leg of the circuit seems to attenuate Channel "M" Delay Feedback, and the other somehow affects Channel "R" Gain. Could it hurt anything if I used two SP3T instead to allow for combinations of settings?



  2. #2
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    Hi,
    I have the same panoramic unit and reverb and am trying to set up something similar. My switch is intact, but I don't have the power transformer to check the voltages.
    One thing I did notice from the schematic is that the heater voltage should be 6.3 rather than 12. The tubes are hooked up with there heaters in series.
    I was wondering if you ever got any farther in your build?

  3. #3
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    hi, this topic is not recent but I just got a Panoramic Tone converter and I wanted to ask if you had more information about this. You must have finished yours by now. I think you were wrong about the switch, i think it's a 4PST. Did you manage to get de schematics? what are those components cased in wax?

  4. #4
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    Quote Originally Posted by ernie View Post
    I've gotten hold of a Baldwin Panoramic Tone Convertor with the spring tank. It's missing the power supply and has a broken switch. A co-worker was kind enough to test the tubes, draw up a pinout diagram for the round octal 'P.T. POWER SOCKET' connector, and calculate his best estimate for the proper voltages. Could anyone with a bit of organ experience give their take on the accuracy? I'd like to build a suitable power supply and try using this effect in the mix.


    The broken switch appears to be a rotary-style DP3T. One leg of the circuit seems to attenuate Channel "M" Delay Feedback, and the other somehow affects Channel "R" Gain. Could it hurt anything if I used two SP3T instead to allow for combinations of settings?
    Sorry didn't see this was from 2009! Anyway,
    Check the heater wiring carefully. 12AX7's have 6.3v heaters, 12 volts will blow them. I think they must be wired in series parallel, since there are four.
    I'm not familiar with this device but I don't see why you shouldn't separate the switches, if there is no connection between the two circuits.
    BTW I learned tube (valve) technology at college (transistors were in their infancy) and my first real job was Q/C'ing Hammond organs.
    Mick Berg
    Last edited by Mick Berg; Jan-29-2016 at 07:52. Reason: snipped pictures, or tried to!

  5. #5
    Vice Admiral Virtuoso Dorsetmike's Avatar
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    The 12AX7 is a double triode, each triode has its own 6.3V heater yet there are only 3 heater connections, Triode 1, Triode 2 and a common centre tap so they can be connected either in series - needing 12.6V or in parallel - needing 6.3V. They are still being made (in China)

    https://en.wikipedia.org/wiki/12AX7

    http://uk.rs-online.com/web/p/produc...FeQRoCkTLw_wcB
    Cheers MIKE.

    How many roads must a man walk down ... ... before he admits he's lost?

  6. #6
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    Quote Originally Posted by Dorsetmike View Post
    The 12AX7 is a double triode, each triode has its own 6.3V heater yet there are only 3 heater connections, Triode 1, Triode 2 and a common centre tap so they can be connected either in series - needing 12.6V or in parallel - needing 6.3V. They are still being made (in China)

    https://en.wikipedia.org/wiki/12AX7

    http://uk.rs-online.com/web/p/produc...FeQRoCkTLw_wcB
    Right, I remember now. It's been a while, 50 years?
    Mick

  7. #7
    Vice Admiral Virtuoso Dorsetmike's Avatar
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    When I started (1951) it was still mostly octal based valves (like 6V6) with some 9 pin ones, (like EF50); them little all glass ones were only starting to appear in anything other than battery radios, and only started to proliferate around 1953.

    I had a Hallicrafter SX28 radio 1940s vintage ex military WW2, had about 9 or 10 octal valves and covered the medium wave and numerous short wavebands, used to listen to Voice of America Jazz every evening in Egypt (RAF duty), sent it home from the middle east when I finished my tour of RAF duty there, wife was not impressed with it's appearance so it had to go.

    Baldwin Panoramic Tone Convertor-mysx28-1-jpg
    Cheers MIKE.

    How many roads must a man walk down ... ... before he admits he's lost?

  8. #8
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    Quote Originally Posted by Dorsetmike View Post
    When I started (1951) it was still mostly octal based valves (like 6V6) with some 9 pin ones, (like EF50); them little all glass ones were only starting to appear in anything other than battery radios, and only started to proliferate around 1953.

    I had a Hallicrafter SX28 radio 1940s vintage ex military WW2, had about 9 or 10 octal valves and covered the medium wave and numerous short wavebands, used to listen to Voice of America Jazz every evening in Egypt (RAF duty), sent it home from the middle east when I finished my tour of RAF duty there, wife was not impressed with it's appearance so it had to go.
    Well I think it looks great. Did you ever visit the surplus stores on Edgware Road and Tottenham Court Road in central London, chock full of all kinds of amazing stuff surplus from the war.

    You probably share my interest in Bletchley Park and its incredible inventions. My unsung hero is Tommy Flowers, almost as important as Turing, but has received virtually no recognition for his amazing work.

    Cheers,
    Mick
    Last edited by Mick Berg; Feb-04-2016 at 22:23.

  9. #9
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    recently pulled the same unit from a baldwin ht2 organ. i have the converter, the reverb tank and the power amplifier. I have been looking all over but cant seem to find schematics for either piece. I am hoping you have had better luck. Im a novice and cant seem to get started without the schematic. thanks

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