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Author Topic: Guitar Amp powering off?  (Read 7493 times)

John Roberts {JR}

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Re: Guitar Amp powering off?
« Reply #30 on: March 11, 2014, 11:37:47 am »

Yup, that's the plan. If I can make this work I'll publish the plans here for fun. The Brits made a lot of these tubes, as well as the Russians (for fighter jets with hardened electronics that could survive a nuclear EMT pulse). You can find NOS (New Old Stock) hearing aid tubes/valves on eBay for $5 each or so, but of course there's not a lot of practical uses for them. I think that tube-active guitar pickups are just the home for them.

I officially do not approve feeding the madness. Why not add a LED and tell them it's a tube. :-)

Back a couple decades ago I designed a "DIC" A direct injection cord, that was a phantom powered JFET buffer/preamp built into the barrel of a 1/4" guitar plug. This JFET front end was low noise and high impedance so we could get all the HF content and edge the guitar pickup was capable of, cleanly.

While I was able to get the guitar input clean and accurate, it generally sounded very thin, because the guitar interacts with the guitar amp significantly to develop it's full "sound".

JR
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Mike Sokol

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Re: Guitar Amp powering off?
« Reply #31 on: March 11, 2014, 11:54:38 am »

I officially do not approve feeding the madness. Why not add a LED and tell them it's a tube. :-)
JR

Like this Yamaha THR guitar amp with Orange-Glow LEDs and no actual tubes?  ;)

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John Roberts {JR}

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Re: Guitar Amp powering off?
« Reply #32 on: March 11, 2014, 12:11:26 pm »

Like this Yamaha THR guitar amp with Orange-Glow LEDs and no actual tubes?  ;)

And Yamaha was not the first or only manufacturer to do that...  Conversely at Peavey I recall having some actual tube products designed to be used with guitars that we couldn't give away.

One very nice simple 4 input tube mixer was intended for combining a few pedal effects between a guitar and amp, using an all tube path. I got involved when these became slow moving inventory that I had to figure out how to get rid of. ::)

They were too clean to sell as a tube sonic effect. I tried to dirty them up some by increasing the gain. No love for real tubes. 

JR
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Steve M Smith

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Re: Guitar Amp powering off?
« Reply #33 on: March 11, 2014, 12:15:04 pm »

Yup, that's the plan. If I can make this work I'll publish the plans here for fun. The Brits made a lot of these tubes, as well as the Russians (for fighter jets with hardened electronics that could survive a nuclear EMT pulse). You can find NOS (New Old Stock) hearing aid tubes/valves on eBay for $5 each or so, but of course there's not a lot of practical uses for them. I think that tube-active guitar pickups are just the home for them.

Not much different to the valves in Neumann (and other) microphones: http://www.saturn-sound.com/Curio's/what%20valve%20in%20what%20microphone.htm


Steve.
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