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Depending on the style of music you play we have a tube set that will fit your needs. If we set the roll-off at 1kHz then, the frequency response of the reverb driver will end up being flat up to 1kHz, then attenuated at higher frequencies, which is fine. Subject to credit approval. Includes 10 business days handling time after receipt of cleared payment. By taking advantage of high-impedance tanks usually intended for op-amp drivers we can build much simpler valve drivers.

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In this case the load is formed by the parallel combination of Ra and Rl, which are both 22k, making ell84 in total ignoring the coil which is negligible and the output coupling capacitor which is large. Any international shipping and import charges are paid in part to Pitney Bowes Inc.

The Valve Wizard

The Valve Wizard How to design valve guitar amplifiers! I had a Maz 38 and it sounded really good but was a little too much amp for most of my applications. In fact, power dissipated in the coil is minimal because it is inductive, so voltage and revreb are 90 degrees out of phase, but this poor power factor also means that the ‘apparent power’ that must actually be supplied is more like a few hundred milliwatts at 1kHz.

A VHT Pittbull 45 is exactly what you described and you can get them used for silly low prices.


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More information on reverb tanks is also available at Rod Elliot’s site. Learn more – opens in a new window or tab.

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. At Hz we would need only half the drive voltage half the power.

VOX Cambridge Reverb Power Amp Primo Tube Set EL84 | eBay

Interest will be charged to your account from the purchase date if the balance is not paid in full within 6 months. Not too gained up. Learn More – opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Special financing available Revetb PayPal Credit at checkout to have the option to pay over time.

The Valve Wizard

Cheap current source drivers: Will ship within 10 business days of receiving cleared payment – opens in a new window or tab. Your name or email address: Carlsbad, California, United States.

The optimum value for both cathode resistors is: As more turns are added, the coupling of the EM field increases and the required current is reduced, so if there were turns we would need only 3. So the actual frequency response at the coil will be a gentle rise up revebr 1kHz, then a slightly steeper drop at revetb frequencies. The necessary filtering can be done at the input, and the input level can be limited to give the right nominal current for the actual tank being used.


Please enter 5 or 9 numbers for the ZIP Code. 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. Home Forums Recent Posts. Nighthawk is what I would describe bright and crunchy. We’ve added some “new” guys to the moderator crew.

You must log in or sign up to reply here. Unfortunately valves are not well suited to this, but there are solutions. A paralleled pair of ECC82s has an internal anode resistance of about 5k, so for maximum power the load should be about 10k.

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You are covered by the eBay Money Back Guarantee if el884 receive an item that is not as described in the listing. Normal rules apply for the design of the power stage, and normally an 8 or 10 ohm tank would be used, to suit a conventional output transformer, but any tank would do, provided the impedance ratio of the OT is suitable. Other offers may also be available.