| Like many Dynaco amplifiers, the designers used
outstanding transformers and then made their cost targets at the expense
of other components. In particular, the
electrolytic capacitors (Quad Capacitor) selected in all Dynaco designs
are both electrically and physically poor designs.
These have very high ESR (effective
series resistance) - this is like having a resistor in series with
the input terminal of each leg of the capacitor. The result is poor
bass, compressed dynamic contrasts and soft and poorly defined highs. To
make matters worse, their aging process is accelerated when exposed to
the warm environment of the SCA35 (or any tube amp for that matter).
This is why "exact" replacements cannot provide better audible
performance and certainly will not provide any increase in system
reliability.
In the Dynaco SCA-35, the designers not
only used these caps in the power supply (like all other Dynaco amps)
but worse, they used them in the cathode bypass circuit of the power
amplifiers. The SCA-35, unlike the Stereo-70 and MK-2/3 does not use a
fixed bias system but rather "self bias' which requires that high
value capacitor be placed in the cathode circuit of the output tubes.
Quality is critical here since they are squarely in the signal path.
Consequently more than any other Dynaco
amplifier, the SCA35 stands to yield the most dramatic performance and
reliability improvement when these caps are replaced with modern
technology caps.
Our solution is a complete system capacitor module. It houses all new
high quality capacitors, associated filter resistors plus new
rectification. Plus - we bypass every
capacitor with high quality polypropylene film to ensure a musically
clean signal path.
The result is a dramatic improvement in every aspect of the
amplifier. All of the potential, hidden in the amplifier is realized
when provide with the power to come through. The mids become more
focused and refined and this extends into the highest frequencies. Bass
is dramatically improved - you will be amazed at how much bass has been
hidden in this amplifier.
The System Capacitor Module uses the high quality - high reliability
radial capacitors that are rated conservatively both electrically and
environmentally to provide you with years of service. is available as a
blank PC Board, Kit (Board with parts) and Assembled (fully assembled and
tested. The P/N and price for each is shown below along with a few optional
items that you may require to complete your project.
Board assembly and installation are quite
easy. The board is designed to drop into existing mounting holes and wire to
existing connections inside your amplifier. You should be able to complete
the project within a few hours depending upon your experience. You can
download a copy of the Assembly & Installation
Manual to review the project in its entirety.
·
Blank Board (P/N PWB-S35C) @ $65
·
Blank Board w/ parts (P/N KIT-S35C) @ $155
·
Assembled & Tested Board (P/N ASM-S35C) @ $195
Recommended Options
·
5 Pin Terminal Strip Teflon Rewire Kit (P/N TS-5) @ $8/
ea
·
Teflon Rewire Kit (4X 10ft Red, Black, Wht, Grn) (P/N
TWK) @ $24/ set
|
