Whammerdyne Truth Owner'S Manual Download Page 4 | Manualshive

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Table Of Contents

Functional Diagram

6DJ8

Bias

Volume

(fine)

Volume

(coarse)

Input

Autoformer

Volume

Control

Meter Switch

B = Left Ch

C = Right Ch

25-turn trimpot

(fine adjust)

2A3 Bias

Meter Switch

A = Left Ch

D = Right Ch

Filament

Regulator

B+

Regulator

8

4

Ground

6DJ8

6922

2A3

Truth 2A3 Amplifier

Z-Direct ©

Interface

Symmetric

Dynamic

Load

Ultrawideband

Output

Transformer

© 2015 Whammerdyne Heavy Industries

current

sense

current

sense

(medium

adjust)

(coarse

adjust)

Symmetric

Dynamic

Load

Design Features ............................................................................................................................1
Controls .........................................................................................................................................2
Installation and Setup ....................................................................................................................4
Speakers ........................................................................................................................................5
Setting the Bias .............................................................................................................................5
Calibration Procedure Left Channel ...............................................................................................7
Calibration Procedure Right Channel .............................................................................................8
Bias Drift Over Time .......................................................................................................................9
Typical Measured Specifications .................................................................................................10
Warranty ......................................................................................................................................11

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Summary of Contents for Truth

Page 1: ...Whammerdyne H E A V Y I N D U S T R I E S The Ultimate 2A3 Single Ended Triode Amplifier Owners Manual www whammerdyne com ...

Page 2: ...ype of tube is used the amplifier will be damaged and the warranty voided Do not force tubes into the socket check to be sure the pin orientation is correct then use a gentle rocking motion to insert or remove the tube When performing the bias adjustment DO NOT use a metal screwdriver use the provided adjustment tool If this is missing a replacement adjustment tool can be ordered from Mouser Elect...

Page 3: ...instant recovery from clipping It s a difference you can hear and enjoy for the life of the amplifier Speaking of life the Truth has a precision bias circuit that lets you optimize all of the tubes for optimum sound and the longest possible life Although the Truth amplifier is ready to plug and play thanks to the extended burn in and testing at the factory there s an optional bias setting procedur...

Page 4: ... 8 4 Ground 6DJ8 6922 2A3 Truth 2A3 Amplifier Z Direct Interface Symmetric Dynamic Load Ultrawideband Output Transformer 2015 Whammerdyne Heavy Industries current sense current sense medium adjust coarse adjust Symmetric Dynamic Load Design Features 1 Controls 2 Installation and Setup 4 Speakers 5 Setting the Bias 5 Calibration Procedure Left Channel 7 Calibration Procedure Right Channel 8 Bias Dr...

Page 5: ... to the level you prefer The 2 stage triode circuit uses the Z Direct Interface with all tubes operated in a stable fixed bias mode The Z Direct Interface unlike conventional RC coupling does not store energy and does not block when the 2A3 draws grid current This provides immediate recovery from overload and the impression of a much more powerful amplifier than the steady state RMS power rating T...

Page 6: ...www whammerdyne com 2 Controls ...

Page 7: ...e variations or AC line quality As we all know the quality of the 60 cycle AC waveform has gotten worse over the decades thanks to noise from switching supplies in TV sets and computers and the many RF transmitters in modern households The electrostatic shielded power transformer of the Truth amplifier acts like a filter against these noise sources so they do not contaminate the delicate audio sig...

Page 8: ...lies The Truth amplifier is the exact opposite it has moderate power output a very sophisticated power supply and doesn t need an aftermarket power conditioner For interconnects we recommend Blue Jeans Cable LC 1 RCA cables These provide double copper braid shielding and very low capacitance which lowers the high frequency drive current requirement from the source components For speaker cables we ...

Page 9: ...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...

Page 10: ...e 2A3 Each channel has its own independent set of bias controls and the meter select switch lets you see the effect of the controls on each channel of the 6DJ8 and each 2A3 When you make the bias adjustments please use the provided white gloves to prevent inadvertent contact with the 2A3 tubes and the provided adjustment tool If necessary a replacement adjustment tool can be ordered from Mouser El...

Page 11: ...loves and insert the adjustment tool into the top hole Rotate the trimpot so the meter reads a low value around 10 mA In most cases these will be counter clockwise turns This is a 25 turn trimpot so it will take several rotations 5 Insert the tool in the bottom hole 2A3 bias medium adjust switch Rotate until the meter falls in the 40 to 60 mA range 6 If there are not enough steps back off two step...

Page 12: ...m hole 2A3 bias medium adjust switch Rotate until the meter falls in the 40 to 60 mA range 6 If there are not enough steps back off two steps move the tool to the middle hole 6DJ8 bias coarse adjust switch and increase by another step 7 If necessary move the tool to the top hole trimpot and rotate until the current reads 60 mA In most cases this is a clockwise rotation Please turn slowly so the ci...

Page 13: ... amplifier or not bias at all in a fixed bias amplifier It s a little counter intuitive but fixed bias amplifiers actually have bias adjustments along with bias meters If you find the upgrade tubes are drifting over time we strongly suggest removing them and replacing them with the original tubes the amplifier came with There are wonderful tubes out there but there are some fakes as well The preci...

Page 14: ... JJ 2A3 40 6DJ8 6922 7308 CCa E88CC E188CC Front panel indicators and controls 1x Custom Simpson plate current meter L R bias for 2A3 L R bias for 6DJ8 2x Custom Simpson relative power meters approx 1 Watt RMS into 8 Ohms the start of the red marker 3 5 Watts RMS full scale 2x Independent coarse L R stepped volume control Rotary switch 12 position 0 5 8 75 12 5 16 25 20 23 75 27 5 31 25 35 38 5 dB...

Page 15: ... Heavy Industries 2827 NE Alberta St Portland Oregon 97211 USA Tel 503 887 9015 Pacific Time Email info whammerdyne com Web www whammerdyne com The Truth 2A3 amplifier is designed manufactured and tested in the United States of America 2015 Whammerdyne Heavy Industries All rights reserved Printed in the USA Rev 4 08 15 0 Website design and branding by DDG www doreydesigngroup com ...

Page 16: ...www whammerdyne com ...

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