Provided the resistance is large compared to the coil’s impedance ten times, say , the coil’s varying impedance will make almost no difference to the current flowing through the resistor and coil over a wide bandwidth. Choosing the roll-off point for the input filter depends somewhat on taste. In this case, C1 and C2 attenuate frequencies below about Hz and above 2. I’m heading out of town tomorrow for a week. Based on my experience with the Bugera 22 https:

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This amount is subject to change until you make payment. Jan 23, You must log in or sign up to reply here. Jan 23, 6. No additional import charges at delivery!

Learn More – opens in a new window or el844 Any international shipping and import charges are paid in part to Pitney Bowes Inc.

VOX Cambridge Reverb Power Amp Primo Tube Set EL84 | eBay

For driving medium impedance tanks to ohms, say a more ‘up-to-date’ solution would be to use an SRPP.

But just a little. Other manufacturers’ tanks are probably very similar.

Carlsbad, California, United States. Obviously the drawback of el884 method is that we must use both triodes to obtain sufficient power since no OT is used.


The Valve Wizard

So the actual frequency feverb at the coil will be a gentle rise up to 1kHz, then a slightly steeper drop at higher frequencies. Taking a bias point of roughly -6V, the AC loadline [below] indicates that at full 12Vp-p input we obtain about 12mAp-p swing shared between the two load resistors making 6mA p-p or 2.

The Valve Wizard How to design valve guitar amplifiers!

Add to watch list. Shipping cost cannot be calculated. Unfortunately, the input coil is an inductor so its impedance rises linearly with frequency.

As more turns are added, the coupling of the EM field increases and the required revreb is reduced, so if there were turns we would need only 3. AtmosphericJan 23, This is perfectly good for many users, but for a flatter response there is an obvious modification; use a triode.

See other items More See all condition definitions – opens in a new wl84 or tab More information on reverb tanks is also available at Rod Elliot’s site.

The Valve Wizard

This item will be shipped through the Fl84 Shipping Program and includes international tracking. Please enter a valid ZIP Code. Email to friends Share on Facebook – opens in a new window or tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab Add to watch list.


No, create an account now. An SRPP can deliver significant current into relatively heavy fixed loads.

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A larger triode like an ECC99 or even a triode-strapped pentode might be used on its own. The voltage required to achieve the Nominal Drive Current can be found from Ohm’s law: The Nighthawk is revern little darker and dirtier. R1 simply allows the coupling capacitor to discharge if the tank is disconnected. The most important thing to note here is that it is current which drives the tank.

Ideally then, the coil should be driven by a constant audio current signal, so that all frequencies geverb delivered into the springs at equal amplitude. A special thank you to the ‘new’ guys that helping out.

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