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Thread: Filmosound guitar amp conversion

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    Supporting Member mozz's Avatar
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    Filmosound guitar amp conversion

    Filmosound guitar amp conversion. Model 179. Before i finish the build, i finished the schematic, stealing a couple parts from other amps and some original to the Bell and Hollow filmosound model 179. I need opinions, corrections, etc.

    Now with actual working voltages, some voltages are from original schematic (110-117v) power supply. Originally was cathode bias, changed to fixed bias. It has a few less tubes than stock and my wall voltage is 122 today, so i expect it to be high. I can get 17 watts output clean, plate voltage 410 and tube current 25ma each. 73% dissipation or close. (jj6v6s) I may drop the B node down a bit, i have a 1k in there now. No sound checks until the wife goes out saturday. No oscillation of hum, which is a good sign.

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    Last edited by mozz; 04-25-2017 at 12:32 AM.

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    I've heard a couple of Filmosound conversions that sounded great! The nice thing about using those old projectors is that (1) there are thousands of them sitting in high school store rooms etc (though probably most have been disposed of by now) and (2) nobody will ever want them! So it's cool to ravage and reuse the parts.

    I have a Filmosound booster amp that I picked up cheap. It even came with a gently used P12Q speaker. Unfortunately it's not like the common model 179 projector amps. There's a pair of 6L6 and a single 6SL7; not quite enough gain for a guitar amp, so it sits quietly until I figure out something to do with it. I might need to cut a hole for another tube...

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    Hello mozz

    I have a Filmosound model 179 amplifier.
    I want to convert it into a guitar amplifier.
    I would like to know if you had to make corrections to your shemat and if it operates property in its current version.

    Thank you

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  4. #4
    Supporting Member mozz's Avatar
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