When a current is passed through the coil the changing magnetic field exerts a tiny twisting force on the pole, which twists the spring too, of course. I need spring reverb. Unfortunately valves are not well suited to this, but there are solutions. The DC resistance of the coil is negligible, except at very low frequencies which we don’t need- anything below about Hz is too muddy to be of use. The spring vibrations are then picked up in the opposite manner at the other end of the tank. Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. Jan 22, 1.

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Log in or Sign up. The input sensitivity is now about 5Vp-p, distortion is mainly glorious 2nd harmonic and the final frequency response is closer to the desired one. Yes, my password is: Jan 23, 6. Unfortunately it doesn’t, as discussed, so at frequencies above and below 1kHz the reflected impedance to the valve will be higher and lower respectively, resulting in reduced power output. Learn more – opens in new window or tab.

Accutronics quote the saturation current of their cores as 3. Read more about the condition. Report item – opens in a new window or tab. Please enter 5 or 9 numbers for the ZIP Code. Learn More – opens in a new window or tab Any international shipping and import charges are paid in part to Pitney Bowes Inc.


Boutique EL84 combo with reverb

The input transducer of a reverb tank is a coil of wire wound around an iron core. Seller does not offer returns.

Choosing the roll-off point for the input filter depends somewhat on taste. They are PCB but the build quality is as good as it gets imho.

The Lightning is considered the brighter think Vox top boost of the three 15 watt amps in the lineup. Learn more – opens in a new window or tab. The circuit reerb illustrates how this might work. Learn More – opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc.

The Valve Wizard

Unfortunately, the input coil is an inductor so its impedance rises linearly with frequency. When a current is passed through the coil the changing magnetic field exerts a tiny twisting force on the pole, which twists the spring too, of course.

LanceJan 23, The schematic [right] shows the EL84 in triode mode. Jan 22, 1.

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Overdriving it will cause heavy distortion and is generally undesirable. This amount is subject to change until you make payment. More information on reverb tanks is also available at Rod Elliot’s site. The Lightning has more tone tweaking capabilities: The coil’s impedance will double with a doubling of frequency, so at 2kHz we would need twice the drive voltage to obtain the same drive current and therefore twice the power.


A paralleled pair of ECC82s has an internal anode resistance of about 5k, so for maximum power the load should be about 10k.

R1 rsverb allows the coupling capacitor to discharge if the tank is disconnected. Depending on the style of music you play we have a tube set that will fit your needs.

VOX Cambridge Reverb Power Amp Primo Tube Set EL84 | eBay

This out-of-date method can be improved slightly by using a smaller coupling cap, so that the drive voltage to the power valve doubles with every octave, thereby compensating for the increasing impedance of the coil.

Therefore, if we were to apply a constant audio voltage signal to the coil, we would find that current through the coil would be less at high frequencies than at low frequencies, so the reverb sound would end up being ‘bass heavy’ and would sound very dull indeed! CrowderJan 23, Based on my experience with the Bugera 22 https: