Dynaco ST-70 with VTA driver board Kit REBUILD assembly manual
In addition to the rebuild kit you will need in order to complete the ST-70 assembly
3 transformers (1 X PA-060 power transformer, 2 X A-470 output transformers)
* 1 VTA driver board and parts set
1 C-354 choke
4 X 1000 ohm resistors
the original 7 lug terminal strip
the dual .02 ceramic disk capacitor that was on lugs 5, 6 and 7 of the 7 lug terminal strip
2 grounding lugs
1 AC power cord
1 fuse post and fuse
1 rubber grommet
2 slide switches > 1 power switch, 1 stereo/mono switch
4 X EL34
* 3 X 12AT7
1 X GZ34 tubes
NOTE > Items marked with an asterisk are not found on an original ST-70
Optionally painting the transformers
You may, as an option, paint your transformers for a better appearance with some type of
heat resistant paint. Recommended, are any type of paint used to paint automobile engine
blocks (engine enamel) or paint used to paint barbecue grilles. To most people a semi-gloss
paint looks best on transformers. Use a spray can – don’t brush it on.
Recommended paints are Krylon BBQ and Stove paint (Krylon # 1618) OR any type of semi-
gloss automobile engine enamel in a spray can. This is usually carried by Wal-Mart and many
other stores. Go to an auto supply store for engine enamel.
1. Obtain SIX 8 X 32 machine screws 2 ½ to 3 inches long with nuts.
2. Remove one transformer 8 X 32 nut, nylon spacer(s) and screw and replace it with one
of the six machine screws and nut. Tighten the nut securely.
3. Do the same for the transformer screw on the opposite diagonal corner of the
transformer.
4. Remove the other two 8 X 32 screws, nylon spacers and nuts on that transformer.
5. Repeat steps 2 through 4 for the other two transformers.
6. Sand any imperfections in the factory paint off the three transformers with 100 grit
paper. Sand again with 220 grit paper
7. Remove all sanding dust from the outer surface of the transformer.
8. Cover the transformer wires by placing them in a plastic bag. Use some masking tape
near the transformer to hold the bag on the wires.
9. Spray 3 light coats on each transformer and allow to dry overnight.
10. Remove the plastic bags that cover the wires
11. Reinstall all the original screws, spacers and nuts.
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