DYNACO Stereo 70 Manual Pemulihan - Halaman 8

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Dynaco Stereo 70 Power Amplifier

Restoration Manual

Detailed Procedure & Guide

Page 8

R0 4-03

III. Cleaning & Preparation

Before you begin the steps to reassemble and restore you amplifier you will probably

want to clean and prep your chassis and the transformers for reuse.

Depending upon the condition of your chassis, it may require moderate or extensive

cleaning and if sufficiently pitted, resurfacing. The extent of your effort depends not only

on the condition of your chassis but also your expectation regarding its appearance. In

either case, its electrical and audible performance will not be impacted regardless of how

you approach the physical restoration of the chassis. We have restored many Dynaco

power amplifiers and always begin by cleaning the amplifier chassis in a strong solution

of dishwater detergent (Dawn) with a mild addition of ammonia (not too strong as it may

lift the printing). Using a soft nylon brush (and toothbrush) we remove much of the

surface dirt and oxidation. I advise against abrasive pads like scotchbrite that can scratch

and dull the finish. After the amplifier is completely dry we follow this with automobile

chrome cleaner to remove another layer of imbedded dirt and even some rust. Again, be

careful to not get too aggressive as you may harm the lettering. For those of you that

don't care about retaining the original Dynaco lettering, you can use more aggressive

cleaning solutions to remove all surface rust. You can always try your method initially on

the inside of the chassis to sample the effect. It should be noted that many builders like

the satin metal look that can be achieved using scotchbrite in a controlled moderately

aggressive manner. Finally you may wish to investigate local metal finishing houses that

will re-chrome your chassis for a nominal fee.

Next you will want to clean the transformers. You will obtain very good results using

common window cleaner. Be careful to not get any liquid inside the transformer end bells

or on the metal laminations. If your end bells are sufficiently tarnished you should

remove them and have them painted using high temperature automotive paint.

Many of the early transformer leads used cloth insulation. This insulation when subjected

over time to the environment under the Stereo-70 chassis may have become very hard

and brittle and will crack once moved. I suggest using 1/8" heat shrink tubing to re-

insulate each of the effected leads. Be sure to slide the heat shrink all the way down to the

full length of the lead and above all be certain to label each lead with its original color

code identity.

After you have cleaned and prepared your chassis and transformer you will begin to re-

assemble your amplifier.