Some budget amps even use a single ECC83 12AX7 which is capable of delivering about mW into a k load impedance , but it has a reputation for producing a weak sound. This is due both to its limited output power, a weak recovery stage and the fact that a 50k to k output transformer needs a very high primary inductance in order to produce low frequencies well like 50 Henrys! By taking advantage of high-impedance tanks usually intended for op-amp drivers we can build much simpler valve drivers. Report item – opens in a new window or tab. Skip to main content. Lance Keltner has some amazing videos of Matchless Nighthawk and Spitfire, but he uses some pedals so they are not perfect description about amp cababilities. Obviously the headroom of the stage should be sufficient to accommodate the larger high frequency amplitudes, and the more headroom the better- a distorted reverb sound is rarely a good thing.

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Sales tax may apply when shipping to: Although the previous circuit produces reasonable results, el884 is not without its shortcomings. Dr Z Maz might suit you.

The Valve Wizard

Crowder and Atmospheric like this. More information on reverb tanks is also available at Rod Elliot’s site. The spring which has a magnetic pole on the end passes through an aperture in the transducer core. A total load of about 2. Email to friends Share on Facebook – opens in a new window el8 tab Share on Twitter – opens in a new window or tab Share on Pinterest – opens in a new window or tab.


The rreverb signal required for 1W output is about 4.

Log in or Sign up. Jan 23, 6. Fantastic amps and built incredibly. Most Active Authors Latest Reviews.

Back to home page. I had a Maz 38 and it sounded really good but was a little too much amp for most of my applications.

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Learn More – opens in a new window or tab International shipping and import charges paid to Pitney Bowes Inc. Jan 23, 9. So I can’t pull the trigger on anything until I get back.

For additional information, see the Global Shipping Program terms and conditions – opens in a new window or tab. The circuit [right] illustrates how this might work. There is no revrrb bypass capacitor since excessive output power is not required.

At Hz we would need only half the drive voltage half the power. For the richest reverb sound, and for the lowest noise, the input transducer should be driven hard- almost to the point of saturation.

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The Valve Wizard

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. For good reverb sounds there is no particular need for strong frequency content above 1kHz as these can sound too ‘tinny’ or shrill.


Interestingly, Rod Elliot has noted that the coils can be driven up to 10 times harder than the Nominal Drive Current, without saturating, but that the signal recovered at the other end of the tank is hardly increased by doing so, so there is not much reerb doing it. The most important thing to note here is that it is current which drives the tank. Seller does not offer returns.

That’s the average selling price from what I see, and I follow them on Reverb very closely. Some budget amps even use a single ECC83 12AX7 which is capable of delivering about mW into revefb k load impedancebut it has a reputation for producing a weak sound. 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.

How Spring Reverb works, in brief: Obviously the drawback of this method is that we must use both triodes to obtain sufficient power since no OT is used. The Gear Page is run by musicians for musicians.