DIY Tunable Pickup

Self built and self assembly ;)

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jeremyb
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DIY Tunable Pickup

Post by jeremyb »

Interesting concept, like a fluence or similar I guess...

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MikeC
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Re: DIY Tunable Pickup

Post by MikeC »

jeremyb wrote: Thu Mar 07, 2024 11:48 am Interesting concept, like a fluence or similar I guess...

Here's an interesting tidbit - back in the Sixties Vox invented their own spring reverb unit using a ceramic record cartridge at each end driving a springy wire thingy. It was used in the Vox AC10 SRT. They could have used the Hammond reverb tanks like everyone else did but they didn't want to pay Hammond the royalties!
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Re: DIY Tunable Pickup

Post by MikeC »

More on that AC10 SRT "reverb" from the "Vox Showroom" website...

The AC10SRT used the infamous Vox crystal phono cartridge based reverb pan. Tom Jennings, the president of Vox, resented having to pay the $1 per amp licensing fee charged by Hammond Accutronics fee for the use of their patented reverb pan. Instead, he designed his own reverb pan, just barely skirting the patents on the Accutronics unit.

The reverb pan designed by JMI used two 1 volt output ACOS GR71 or two Sonotone 2T crystal phono cartridges for drive and receive transducers. A single delay spring was connected to the needle saddles of each cartridge.

About all one could say about the JMI reverb pan is it worked to a degree, but the tone and depth of the reverb was certainly lacking when compared to Fender amps of this era. Furthermore, this phono cartridge based reverb pan would easily slip into a howling acoustic feedback if the amp was played too loudly (I bet that would hardly ever happen with guitarists...LOL)!
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