TU-8200DX - guidelines for exchanging the capacitors for better sound quality.

Posted by vkung (S) on January 26, 2014 at 18:50:47

8Ω loaded
UL 8W + 8W (6L6GC)
Pentode 8.2W + 8.2W (6L6GC)
Triode 4W + 4W (6L6GC)

The circuit around the jumper plug has high voltage and it is dangerous
to touch the PCB without caution. Make sure to turn OFF the power and unplug the AC power cord, then wait for at least 10 minutes before changing the jumper connection.

Also, changing the connection while the power is ON could damage the
tubes and the output transformers. Therefore please refrain from modifying the amp, such as adding a switch to change the connection.

Triode configuration

DX Model

Here are some guidelines for exchanging the capacitors for better sound quality.

1. Exchanging the cathode bypass capacitors with conductive polymer
aluminum solid electrolytic capacitors with low ESR is very effective.
In this amp, the 4 capacitors of C1, C2, C5, and C6 are used as
cathode bypass capacitors. By default they are 220μF 16V aluminum
electrolytic capacitors. If you exchange, make sure the value is
between 150 to 220μF, and the rated voltage is 10V.

2. Coupling capacitors affect the sound as well. In this amp, the PCB is
designed with some extra space around C3, C4, C9, and C10 so that
users can exchange those coupling capacitors with different ones.
However, those originally included are polypropylene non-inductive
film capacitors that can cover high frequencies. Therefore you may not
hear the effect even after they are exchanged.

If replacing these capacitors- the value should be higher than 0.1μF,
and the rated voltage should be minimum of 400V. Please make sure to
select one which can fit in the provided space on the PCB without
interference with other parts.

DX Model included
• 4 X Amtrans AMCO 104 Metalized PET film capacitors (GOLD plated OFC leads)C3, C4, C9, and C10
• 4 X Nichikon conductive polymer aluminum electrolytic capacitors C1, C2, C5, and C6

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Topic - TU-8200DX - guidelines for exchanging the capacitors for better sound quality. - vkung 18:50:47 01/26/14 (0)

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