Rebuilding my Accuphase E-202

We specialize in restoring vintage amplifiers/preamplifiers. Almost all our restorations involve replacing all audio circuit resistors, capacitors and ICs.

Time consuming, of course but well worth the effort. Japanese amplifiers are tough to work on due to single sided PCBs and each PCB has many wires connecting to it. Make lots of diagrams and take photos.

The output transitors, if bad, are no longer available and you will be forced to use ON-SEMI MJ series.

The main split rail caps are mostly a head ache due to wierd sizes used. This uses 10,000mfd 63v types and normally these come in 50mm diameter cans, but not always.

Most times we increase the value of these capacitors and then we use one of our in house designed surge limiting circuits to prevent destruction of the power switch. Recently did a McIntosh MC2105, replaced their ugly drive board with again our in house designed fully complementary boards and replaced the 39,000mfd 40v rail caps with 150,000mfd 50v types which of course demanded the surge circuit.

The JFets used in the E202 are obsolete. Hope they are not bad.

I have worked on Accuphase from my days in South Africa so I am well versed in their designs.

Steve Mantz

Zed Audio Corp
www.zedaudiocorp.com
 
Even if you enjoy the Pass clone now, Accuphase E-202 is useful enough to be preserved.
Read also here : https://www.diyaudio.com/community/...iagrams-repair-etc.211108/page-2#post-3558815
Most of the time your work should not be a "somewhat monumental task of completely
rebuilding", because the parts quality is high, I would only address actually failed parts.
Have a look for overheated resistors.

Thank's for your response, but I didn't buy the clone. One thing that scares me is the evaporating copper trace you spoke of. People have mentioned that these are difficult to solder.

The amp just sits in the bottom of my closet for now.