www.whammerdyne.com
5
Speakers
The Whammerdyne team has spent a lot of time listening to many different speakers powered by
the Truth
™
2A3 amplifier. We strongly recommend speakers with >92 dB SPL 1W, 1m efficiency (or
better), 8 ohms nominal impedance (or higher), and simple crossovers or no crossover at all (full-
range designs). We have tested this extensively using the Zu Audio
©
Druid Mk.V, which are 2-way
minimal crossover, 101 dB efficient and a nominal 16 Ohm impedance.
There are many medium to high-efficiency speakers these days, and we recommend listening to the
ones that you enjoy the most. Set aside the reviews, set aside the Internet noise, bring the recordings
that matter to you, and choose the speaker that you really connect with. That’s the right speaker for you.
SETTING THE BIAS
The Truth
™
amplifier comes pre-adjusted from the factory, and is tested, calibrated, and matched
to the installed 6DJ8 input tube and the pair of 2A3 output tubes. The only time you need to do the
entire setting procedure is when the tubes are replaced. (either the 6DJ8 or 2A3) Or when replacing
the original tubes at end of life. (Usually after several thousand hours of operation). You can also do a
“fine-tuning” so the amplifier is thermally matched to its location in your audio system.
Although the procedure might seem complex, all it does is set each channel of the 6DJ8 input tube to
the optimum range of 8 to 12 mA, and each 2A3 output to the optimum 60 mA. The internal circuits
are so precise that the adjustment procedure actually tests the tube as you make the adjustment.
If a replacement tube cannot be adjusted to the optimum current, its performance may be out of
specification. If the current is out of range, the amplifier won’t be harmed, but the tube may have a
shortened life (if the current is too high) or not sound its best (if the current is too low). When each
tube is set to the the green range shown on the current meter, you can be confident you are getting
the best possible performance from the tube.
Its very rare for a tube amplifier to have regulated high volatge power supplies. Our precision
regulated supplies solve plate current changes due to fluctuations in line voltages. Don’t fret and wear
out the adjustments by trying to tweak out the tiny up and down motions to make it always exactly 60
mA because it will still sound great.
Summary of Contents for Truth
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